Kripto 2, Ispit

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| By Catherine Halcomb

Catherine Halcomb

Community Contributor

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1/159 Pitanja

Na slici je prikazana:
- Biometrija koze
- Otisak prsta
- Biometrija lica
- Iris
- Nista od ponudjenog

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2.

Na slici je prikazana biometrija:
- Dlana
- Lica
- Otiska prsta
- Irisa
Correct Answer

A. Irisa

Explanation

The correct answer is "irisa" because the image is showing a biometric feature that is unique to each individual, which is the iris. The iris is the colored part of the eye and it contains patterns that can be used for identification purposes. This biometric feature is commonly used in security systems for authentication and access control.

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3.

"Daugman's Rubber Sheet Model" koristi se za:
- Mapiranje svih tacaka izvan iris regiona na par polarnih kordinata (r, θ), gde je r na intervalu od [0, 1] i θ je ugao [0, 2π]
- Mapiranje svih tacaka unutar iris regiona na par polarnih kordinata (r, θ), gde je r na intervalu od [0, 1] i θ je ugao [0, 2π]
Correct Answer

A. Mapiranje svih tacaka unutar iris regiona na par polarnih kordinata (r, θ), gde je r na intervalu od [0, 1] i θ je ugao [0, 2π]

Explanation

Daugman's Rubber Sheet Model is used for mapping all points within the iris region to a pair of polar coordinates (r, θ), where r is on the interval [0, 1] and θ is an angle on the interval [0, 2π].

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4.

Vremenski pecat je najcesce koriscen u:
- Kerberosu
- IPSec
- SSL
Correct Answer

A. Kerberosu

Explanation

The correct answer is Kerberosu because the question is asking about the most commonly used in "Vremenski pecat" (timestamp in English), and Kerberos is a widely used network authentication protocol that includes a timestamp in its authentication process. IPSec and SSL are also commonly used protocols, but they do not specifically include a timestamp in their operations.

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5.

Protokoli za uzajamnu autentifikaciju su simetricnim kljucevima:
- Potpuno su bezbedni ako koristimo javne kljuceve
- Nisu nikad bezbedni
- Potpuno su bezbedni ako koristimo privatne kljuceve
- Nisu uvek bezbedni, ponekad je moguc napad
Correct Answer

A. Nisu uvek bezbedni, ponekad je moguc napad

Explanation

Protocols for mutual authentication are not always secure because there is a possibility of an attack. This means that even if symmetric keys are used, there are still potential vulnerabilities that can be exploited by attackers. Therefore, the statement "Nisu uvek bezbedni, ponekad je moguc napad" (They are not always secure, sometimes an attack is possible) is the correct answer.

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6.

Emitovanje sa drugih uredjaja i sa drugih pozicija uvek
- Ne daje razlicite impulsne odzive kanala
- Nista od ponudjenog
- Daje razlicite implusne odzive kanala
Correct Answer

A. Daje razlicite implusne odzive kanala

Explanation

This statement suggests that broadcasting from different devices and positions always results in different impulse responses of the channel. This means that the channel's response to a sudden change or impulse in the input signal will vary depending on the device and position from which it is broadcasted.

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7.

Na slici je prikazan:
- Protokol za sifrovanje
- Senonov perfektni kanal za siforvanje
- Vajnerov Wire-Tap kanal
- Sema za generisanje slucajnih kljuceva
Correct Answer

A. Vajnerov Wire-Tap kanal

Explanation

The correct answer is Vajnerov Wire-Tap kanal. The given options are all related to encryption protocols and channels. The Vajnerov Wire-Tap kanal is a specific type of channel that is used in cryptography. It is designed to provide secure communication between two parties, while also allowing a third party to eavesdrop on the communication without being able to decipher the encrypted messages. This channel is often used in scenarios where a government or other authorized entity needs to monitor communication for security purposes.

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8.

Najzastupljeniji format digitalnih sertifikata je:
- X. 507
- X. 508
- X. 509
- X. 590
- X.506
Correct Answer

A. X. 509

Explanation

The correct answer is X. 509. X.509 is the most widely used format for digital certificates. It is an ITU-T standard that defines the structure and content of these certificates, which are used for authentication and secure communication over networks. X.509 certificates are commonly used in technologies such as SSL/TLS for securing websites, VPNs for secure remote access, and digital signatures for verifying the authenticity of digital documents.

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9.

Ukoliko se u autentifikaciji koristi simetricni kljuc za autentifikaciju, tada je moguc;
- DOS napad
- Nijedno od ponudjenog
- MiM napad
- IP spoofing napad
Correct Answer

A. MiM napad

Explanation

If a symmetric key is used for authentication, it is vulnerable to a MiM (Man-in-the-Middle) attack. In this type of attack, an attacker intercepts the communication between the two parties and impersonates each party to the other, making it appear as though they are communicating directly. By doing so, the attacker can gain unauthorized access, manipulate the communication, or steal sensitive information. This vulnerability arises because the symmetric key used for authentication is shared between the two parties and can be intercepted and used by the attacker to impersonate one or both parties.

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10.

Ocekivano rastojanje za dva slucajno generisana binarna niza je:
- 1,5
- 0,08
- 1
- 0,5
Correct Answer

A. 0,5

Explanation

The expected distance for two randomly generated binary sequences is 0.5. This means that on average, the two sequences will differ in exactly half of their positions.

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11.

Jedini uslov za bezbedan rad Wajnerovog Wire-Tap kanala je:
- Da napadac prociscenu verziju signala legitimnog prijemnika
- Da napadac snima signale od oba korisnika
- Da napadac prima zasumljenu verziju signala legitimnog prijemnika
Correct Answer

A. Da napadac prima zasumljenu verziju signala legitimnog prijemnika

Explanation

The only condition for the secure operation of the Wajner Wire-Tap channel is that the attacker receives a noisy version of the legitimate receiver's signal.

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12.

U protokolu za autentifikaciju sa javnim kljucem:
- Trudi ne moze da natera Alisu da desifruje bilo sta!
- Trudi moze da natera Alisu da desifruje bilo sta!
Correct Answer

A. Trudi moze da natera Alisu da desifruje bilo sta!
13.

Satelitski scenario je protokol koji se sastoji iz:
- 5 faza
- 4 faze
- 3 faze
- Zavisi od broja ucesnika u scenariju
- 6 faza
Correct Answer

A. 3 faze

Explanation

The correct answer is 3 faze. The satellite scenario protocol consists of three phases.

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14.

Protokol za autentifikaciju moze zahtevati uspostavu:
- Sesijskog kljuca
- Asimetricnog kljuca
- Javnog kljuca
Correct Answer

A. Sesijskog kljuca

Explanation

The correct answer is "Sesijskog kljuca" (Session key). The explanation for this answer is that a session key is often used in authentication protocols to establish a secure communication channel between two entities. It is a temporary key that is generated for the duration of a session and is used to encrypt and decrypt the data exchanged between the entities. Using a session key ensures confidentiality and integrity of the communication. Asimetricni kljuc (Asymmetric key) and Javni kljuc (Public key) are also cryptographic tools, but they are not specifically mentioned in the context of authentication protocols in the given question.

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15.

Koliko faza protkola je prikazano na slici?
- 2
- 5
- 4
- 3
Correct Answer

A. 3

Explanation

The correct answer is 3 because there are three distinct phases shown in the image.

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16.

U Kerberos protkolu pomocni tiket koji se koristi za pristup mreznim resursima sadrzi:
- Privatni kljuc koji se koristi za tajnu komunikaciju izmedju osobe koja je trazila pomocni tiket i resursa sa kojim zeli da uspostavi komunikaciju
- Asimetricni kljuc koji se koristi za tajnu komunikaciju izmedju osobe koja je trazila pomocni tiket i resursa sa kojim zeli da uspostavi komunikaciju
- Sesijski kljuc koji se koristi za tajnu komunikaciju izmedju osobe koja je trazila pomocni tiket i resursa sa kojim zeli da uspostavi komunikaciju
Correct Answer

A. Sesijski kljuc koji se koristi za tajnu komunikaciju izmedju osobe koja je trazila pomocni tiket i resursa sa kojim zeli da uspostavi komunikaciju

Explanation

The correct answer is the session key that is used for secure communication between the person requesting the ticket and the resource they want to communicate with.

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17.

Tiketi u Kerberos protkolu su:
- Nema nikakvih ogranicenja
- Vremenski ogranicen
- Vremenski neogranicen
- Kljucem ogranicen
Correct Answer

A. Vremenski ogranicen

Explanation

The correct answer is "vremenski ogranicen" which means "time-limited" in English. This means that the tickets in the Kerberos protocol have a specific time limit and will expire after a certain period. This is an important security measure to ensure that the tickets are not valid indefinitely and reduce the risk of unauthorized access.

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18.

Alisa se autentifikovala pred Bobom preko digitalnog potpisa, ako Bob zeli takodje da se autentifikuje, koristice:
- Nijedan od ponudjenih
- Alisin sertifikat
- Alisin privatni kljuc i svoj javni za verifikovanje
- Svoj sertifikat
Correct Answer

A. Svoj sertifikat

Explanation

Bob će koristiti svoj sertifikat kako bi se autentifikovao.

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19.

Razlog zbog cega server od klijenta trazi sertifikat u SSL protkolu je:
- Autentifikacija protokola
- Autorizacija servera
- Autentifikacija servera
- Autentifikacija klijenta
Correct Answer

A. Autentifikacija klijenta

Explanation

The reason why the server requests a certificate from the client in the SSL protocol is for the authentication of the client.

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20.

Autentifikacija moze biti zasnovana na necemu sto:
- Damo
- Jesmo
- Predamo
- Imamo
- Znate
Correct Answer(s)

A. Jesmo
A. Imamo
A. Znate

Explanation

Authentication can be based on something we are (biometric characteristics like fingerprints or facial recognition), something we have (like a physical token or a smart card), or something we know (like a password or PIN). In this case, "jesmo" (we are) and "imamo" (we have) are both valid options for authentication methods. "Znate" (you know) is not a valid option for authentication as it refers to someone else knowing something about us, rather than a personal characteristic or possession.

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21.

PFS podrazumeva:
- Privatni kljuc koji se koristi jednokratno, a zatim trajno unistava
- Simetricni kljuc koji se koristi jednokratno ali se cuva u arhivu na bezbedan nacin
- Sesijski kljuc koji se koristi jednokratno, a zatim trajno unistava
- Sesijski kljuc, i moze da se koristi vise puta
Correct Answer

A. Sesijski kljuc koji se koristi jednokratno, a zatim trajno unistava

Explanation

PFS (Perfect Forward Secrecy) refers to the use of a session key that is used only once and then permanently destroyed. This ensures that even if the session key is compromised in the future, it cannot be used to decrypt past communications. By using a session key that is destroyed after use, PFS provides an additional layer of security and protection against potential attacks on encrypted communications.

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22.

Koji napadi su moguci na protkol sa slike:
- Mogucnost ponovnog slanja
- Mogucnost za kompromitovanje baze podataka sa lozinkama
- Mogucnost za otkrivanje lozinke
Correct Answer

A. Mogucnost ponovnog slanja

Explanation

The correct answer is "mogucnost ponovnog slanja" (possibility of replay attacks). This refers to the vulnerability of the protocol where an attacker can intercept and replay previously captured data, such as login credentials or sensitive information, to gain unauthorized access or perform malicious actions. This can compromise the security and integrity of the system.

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1
23.

Formulom na slici predstavljena je:
- Nista od ponudjenog
- Jaka tajnost u wiretap kanalu
- Slaba tajnost u wiretap kanalu
Correct Answer

A. Jaka tajnost u wiretap kanalu

Explanation

The formula in the picture represents "Jaka tajnost u wiretap kanalu" which translates to "Strong secrecy in the wiretap channel". This suggests that the formula represents a method or system that ensures a high level of secrecy or security in a wiretap channel, which is a channel through which unauthorized individuals may attempt to intercept or access sensitive information.

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24.

Glavni problem u WEP protokolu je;
- Ne ponavlja se IV u jednoj sesiji komunikacije za siforvanje vise hiljada paketa saobracaja
- Ponavlja se IV u jednoj sesiji komunikacije za siforvanje vise hiljada paketa saobracaja
- Ponavlja se otvoreni tekst u jednoj sesiji komunikacije za siforvanje vise hiljada paketa saobracaja
Correct Answer

A. Ponavlja se IV u jednoj sesiji komunikacije za siforvanje vise hiljada paketa saobracaja

Explanation

The main problem in the WEP protocol is that the IV (Initialization Vector) is repeated in one communication session for encrypting thousands of traffic packets. This repetition of the IV makes it easier for attackers to crack the encryption and gain unauthorized access to the communication.

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25.

U protkolu za autentifikaciju sa simetricnim kljucem:
- Alisa i Bob ne moraju da dele iste kljuceve
- Alisa i Bob unapred razmenjuju hes vrednosti kljuca
- Alisa i Bob unapred razmenjuju simetricni kljuc
Correct Answer

A. Alisa i Bob unapred razmenjuju simetricni kljuc

Explanation

In the protocol for symmetric key authentication, Alisa and Bob exchange the symmetric key in advance. This means that they share the same key before the authentication process begins. This allows them to use the same key for encryption and decryption, ensuring secure communication between them. Sharing the symmetric key in advance eliminates the need for Alisa and Bob to share the same keys or exchange hash values of the key.

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26.

Autentifikacija preko Kerberos protokola zasnovana je na:
- Asimetricnom kljucu
- Javnom kljucu
- Privatnom kljucu
- Simetricnom kljucu
Correct Answer

A. Simetricnom kljucu

Explanation

The correct answer is "simetricnom kljucu" which translates to "symmetric key" in English. This means that authentication through the Kerberos protocol is based on the use of a symmetric key. In symmetric key cryptography, the same key is used for both encryption and decryption. This key is shared between the client and the server, allowing them to securely authenticate each other.

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27.

Kerberos protokol za N broj korisnika generise:
- N x N kljuceva
- N x N / 2 kljuceva
- N kljuceva
Correct Answer

A. N kljuceva

Explanation

The Kerberos protocol generates N keys for N number of users. This means that for each user, there is a unique key generated, resulting in a total of N keys.

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28.

Ukoliko je lozinka smislena i sastavljena na osnovu 256 ASCII karaktera:
- Najlakse je pretraziti sve moguce kljuceve
- Nije moguce razbiti lozinku
- Napad je moguce izvesti preko recnika
- Najlakse je napad izvesti preko RAM memorije
Correct Answer

A. Napad je moguce izvesti preko recnika

Explanation

The correct answer is "Napad je moguce izvesti preko recnika" which translates to "It is possible to perform an attack using a dictionary." This means that if the password is meaningful and composed of 256 ASCII characters, it can potentially be cracked by using a dictionary attack, where an attacker tries various words from a dictionary as possible passwords.

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29.

Tehnika koja se koristi za proces segmentacije je:
- Hafov algoritam
- Senonov algoritam
- Hafmanov algoritam
Correct Answer

A. Hafov algoritam

Explanation

The correct answer is Hafov algoritam. Hafov algoritam, also known as the Hough transform, is a technique used for image segmentation. It is particularly useful for detecting and extracting simple geometric shapes, such as lines and circles, from an image. The algorithm works by converting the image data into a parameter space, where the presence of a particular shape is represented by a peak. This allows for the identification and extraction of specific objects or regions of interest within an image.

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30.

Izabrati fizicke fenomene koje mogu da monitorisu uredjaj u sezonskim mrezama:
- Pristisak
- Temperatura
- Duzina kljuca
- Radijus
Correct Answer(s)

A. Pristisak
A. Temperatura

Explanation

The physical phenomena that can be monitored in seasonal networks are pressure and temperature. These variables are commonly measured and monitored in various systems and devices to ensure their proper functioning and to prevent any potential issues or failures. The other options, such as key length and radius, do not relate to physical phenomena that can be monitored in this context.

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31.

Postupak kreiranja digitalnog potpisa se sastoji iz dve faze. U drugoj fazi:
- Primenjuje se odgovarajuci algoritam (RSA) da bi se dobijeni otisak iz prve faze sifrovao privatnim kljucem
- Primenjuje se odgovarajuci algoritam (MD5) da bi se dobijeni otisak iz prve faze sifrovao tajnim kljucem
- Primenjuje se odgovarajuci algoritam (SHA-1) da bi se dobijeni otisak iz prve faze sifrovao privatnim kljucem
- U drugoj fazi dobijeni otisak (iz prve faze) se ne sifruje, vec sam po sebi predstavlja digitalni potpis
Correct Answer

A. Primenjuje se odgovarajuci algoritam (RSA) da bi se dobijeni otisak iz prve faze sifrovao privatnim kljucem

Explanation

In the second phase of creating a digital signature, the correct answer states that the obtained fingerprint from the first phase is encrypted with the private key using the appropriate algorithm (RSA). This step ensures the security and authenticity of the digital signature by encrypting it with the private key, making it difficult for anyone without the corresponding public key to tamper with or forge the signature.

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32.

Sta je podrazumevano pod fazom za normalizaciju irisa?
- Transformaciju iris regiona u fiksne dimenzije koje su unapred poznate
- Transformaciju iris regiona u cesto razlicite dimenzije koje nisu unapred poznate zbog distance
Correct Answer

A. Transformaciju iris regiona u fiksne dimenzije koje su unapred poznate

Explanation

The default phase for iris normalization refers to transforming the iris region into fixed dimensions that are predetermined. This means that regardless of the distance or variation in dimensions of the iris region, it will be transformed into a consistent size that is already known in advance.

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33.

Dizajn kog protokola je prikazan na slici?
- Za uzajamnu autentifikaciju sa simetricnim kljucem
- Za uzajamnu autentifikaciju sa javnim kljucem
- Za jednostranu autentifikaciju sa simetricnim kljucem
Correct Answer

A. Za uzajamnu autentifikaciju sa simetricnim kljucem

Explanation

The correct answer is "for mutual authentication with symmetric key". The design of the protocol shown in the image is intended for both parties to authenticate each other using a shared symmetric key.

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34.

U primeru kod VEB stranice www.amazon.com:
- Autentifikacija klijenta je zahtevana
- Samo ukoliko klijent to zeli
- Autentifikacija klijenta nije zahtevana
Correct Answer

A. Autentifikacija klijenta nije zahtevana

Explanation

The correct answer is "autentifikacija klijenta nije zahtevana" which means "client authentication is not required" in English. This implies that when accessing the webpage www.amazon.com, the client does not need to provide any authentication or login credentials to gain access to the content.

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35.

U protokolu za autentifikaciju sa vremenskim pecatom prvo:
- Desifrujemo, zatim racunamo T vremenski pecat i sifrujemo
- Sifrujemo, zatim racunamo T vremenski pecat i potpisujemo
- Potpisujemo, zatim racunamo T vremenski pecat i sfirujemo
Correct Answer

A. Potpisujemo, zatim racunamo T vremenski pecat i sfirujemo

Explanation

In the given authentication protocol with a timestamp, the correct order of operations is to first sign the message, then calculate the timestamp, and finally encrypt the message. This ensures that the message is securely signed before the timestamp is added, and then the entire message is encrypted for further security.

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36.

Gde je primena WEP protkola?
- Kerberos
- TLS
- SSL
- WiFi
Correct Answer

A. WiFi

Explanation

WEP (Wired Equivalent Privacy) protocol is primarily used in WiFi networks. It is a security protocol that was designed to provide encryption and authentication for wireless networks. WEP is used to protect the confidentiality and integrity of data transmitted over WiFi networks, preventing unauthorized access and eavesdropping. It has been largely replaced by more secure protocols like WPA (Wi-Fi Protected Access) and WPA2, but some older devices and networks still use WEP.

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37.

Na slici Wynerovog wiretap kanala, R predstavlja:
- Zajednicku sucajnost u cilju randomizacije
- Globalnu slucajnost u cilju randomizacije
- Lokalnu slucajnost u cilju randomizacije
Correct Answer

A. Lokalnu slucajnost u cilju randomizacije

Explanation

In the Wyner's wiretap channel, R represents local randomness for the purpose of randomization. This means that R is used to introduce randomness in the encoding process in order to provide security against eavesdroppers. The local randomness ensures that the transmitted information is randomized and cannot be easily deciphered by unauthorized parties.

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38.

Izabrati sloj kom pripada bezbednost na fizickom sloju:
- Link podataka
- Transportni
- Mrezni
- Aplikativni
- Fizicki
Correct Answer

A. Fizicki

Explanation

The correct answer is "Fizicki." The physical layer is responsible for the transmission of raw data bits over a physical medium, such as cables or wireless signals. It deals with the electrical, mechanical, and functional aspects of the physical connection between devices. This layer ensures that the data is transmitted reliably and accurately, without any errors or interference. It is the lowest layer in the OSI model and is primarily concerned with the physical characteristics of the network.

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39.

Na slici je prikazana integracija sistema na:
- Mreznom sloju u aplikativnu arhitekturu
- Aplikativnom sloju u transportnu arhitekturu
- Fizickom sloju u mreznu arhitekturu
- Transportnom sloju u mreznu arhitekturu
Correct Answer

A. Fizickom sloju u mreznu arhitekturu

Explanation

The correct answer is "Fizickom sloju u mreznu arhitekturu" which translates to "Physical layer in the network architecture". This means that the integration of the system is happening at the physical layer of the network architecture.

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40.

U fazi kodovanja biometrije irisa koristi se transformacija:
- 2D Gabor vejvlet
- 1D Gabor vejvlet
- Hafmanov algoritam
- Hafova transformacija
Correct Answer(s)

A. 2D Gabor vejvlet
A. 1D Gabor vejvlet

Explanation

The correct answer is 2D Gabor vejvlet and 1D Gabor vejvlet. In the coding phase of iris biometrics, a transformation called Gabor wavelet is used. Gabor wavelets are mathematical functions that are applied to images to extract features. In the case of iris biometrics, both 2D and 1D Gabor wavelets are utilized to transform the iris image and extract relevant information for identification and authentication purposes.

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41.

Satelitski scenario nije moguc kada je:
- Greska predajne strane veca od greske prijemne strane
- Greska prijemne strane manja od greske napadaca
- Greska prijemne strane veca od greske predajne strane
- Greska napadaca 0
Correct Answer

A. Greska napadaca 0

Explanation

In a satellite scenario, it is not possible for the error of the attacker to be zero. This is because in a satellite communication system, there is always a possibility of errors or interference introduced by various factors such as atmospheric conditions, equipment limitations, or intentional attacks. Therefore, the statement "greska napadaca 0" contradicts the nature of satellite communication systems and is not a possible scenario.

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42.

Koja faza protokola je prikazana na slici?
- Generisanje kljuca
- Pojacavanje privatnosti
- Pojacavanje prisustva
- Destilacija prednosti
- Usaglasavanje informacija
Correct Answer

A. Pojacavanje privatnosti

Explanation

The correct answer is "Pojacavanje privatnosti." This is because the image is depicting a phase in the protocol where privacy is being enhanced or strengthened.

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43.

Izabrati sloj kom pripada IPSec (Virtuelne privatne mreze):
- Mrezni
- Aplikativni
- Fizicki
- Transportni
- Link podataka
Correct Answer

A. Mrezni

Explanation

The correct answer is "Mrezni" because IPSec operates at the network layer of the OSI model. IPSec provides secure communication over IP networks by encrypting and authenticating IP packets. It ensures the confidentiality, integrity, and authenticity of data transmitted over the network.

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44.

Za implementaciju PFS u zastitni protkol, koristi se:
- Digitalni potpis
- TTP
- Kerberos
- Difi-Helman
- Forteza
Correct Answer

A. Difi-Helman

Explanation

The correct answer is Difi-Helman. Difi-Helman is used for implementing Perfect Forward Secrecy (PFS) in a secure protocol. PFS ensures that even if the long-term private key of a party is compromised, the past session keys and communication cannot be decrypted. Difi-Helman allows two parties to establish a shared secret key over an insecure channel, without actually transmitting the key. This key can then be used for secure communication and encryption. Therefore, Difi-Helman is the appropriate choice for implementing PFS in a secure protocol.

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45.

U protokolu za autentifikaciju sa javnim kljucem:
- Uvek se koriste dva para kljuceva za sifrovanje
- Koristi se jedan par kljuceva za digitalno potpisivanje
- Koristi se dva para kljuceva za siforvanje i potpisivanje
Correct Answer

A. Koristi se dva para kljuceva za siforvanje i potpisivanje

Explanation

In the protocol for public key authentication, two pairs of keys are used for encryption and signing. This means that one pair of keys is used for encrypting the data and another pair of keys is used for digitally signing the data. By using two pairs of keys, the protocol ensures both confidentiality and authenticity of the data being transmitted.

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46.

Satelitski scenario sluzi za razmenu:
- Sifrata javnim kanalom
- Javnog kljuca preko tajnog kanala
- Tajnog kljuca preko javnog kanala
- Binarnih sekvenci
Correct Answer

A. Tajnog kljuca preko javnog kanala

Explanation

The correct answer is "tajnog kljuca preko javnog kanala" which translates to "secret key over a public channel" in English. This means that the satellite scenario is used for exchanging secret keys through a public channel.

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47.

Kriticna tacka Kerberos protkola je:
- KDS
- KDC
- KDT
- TGT
- TGTS
- STGT
Correct Answer

A. KDC

Explanation

The correct answer is KDC. In the Kerberos protocol, KDC (Key Distribution Center) is the critical point. It is responsible for issuing and distributing tickets to clients and granting access to requested resources. KDC authenticates users and provides them with TGTs (Ticket Granting Tickets) which they can use to request service tickets for specific resources. Without a functioning KDC, the authentication and authorization process in the Kerberos protocol would be compromised, hindering the secure access to network resources.

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48.

Nakon razmenjene specifikacije, u prvoj fazi SSL protkola:
- Server odlucuje o algoritmima koji ce se koristiti u protokolu
- Klijent i server zajedno donose odluku
- Klijent odlucuje o algoritmima koji ce se koristiti u protokolu
Correct Answer

A. Server odlucuje o algoritmima koji ce se koristiti u protokolu

Explanation

In the first phase of the SSL protocol, the server decides on the algorithms that will be used in the protocol. This means that the server has the authority to choose the encryption and authentication algorithms that will be employed during the SSL handshake. The client does not have the power to make this decision on its own, nor do the client and server jointly make the decision. The server's decision is crucial in determining the security measures that will be implemented during the SSL communication.

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49.

Kod protokola za generisanje i distribuciju kljuceva na fizickom naviou, ako kapacitet tajnosti padne na nulu, tada:
- Alisa obustavlja prenos
- Bob obustavlja prenos
- Alisa podize brzinu
- Eva smanjuje brzinu prenosa
- Eva obustavlja prenos
Correct Answer

A. Alisa obustavlja prenos

Explanation

If the secrecy capacity drops to zero in the protocol for generating and distributing keys at the physical level, Alisa will stop the transmission.

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Current Version
Mar 21, 2023

Quiz Edited by
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Jan 10, 2019

Quiz Created by
Catherine Halcomb

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Kripto 2, Ispit

Na slici je prikazana:

Quiz Preview

Na slici je prikazana biometrija:

"Daugman's Rubber Sheet Model" koristi se za:

Vremenski pecat je najcesce koriscen u:

Protokoli za uzajamnu autentifikaciju su simetricnim kljucevima:

Emitovanje sa drugih uredjaja i sa drugih pozicija uvek

Na slici je prikazan:

Najzastupljeniji format digitalnih sertifikata je:

Ukoliko se u autentifikaciji koristi simetricni kljuc za autentifikaciju, tada je moguc;

Ocekivano rastojanje za dva slucajno generisana binarna niza je:

Jedini uslov za bezbedan rad Wajnerovog Wire-Tap kanala je:

U protokolu za autentifikaciju sa javnim kljucem:

Satelitski scenario je protokol koji se sastoji iz:

Protokol za autentifikaciju moze zahtevati uspostavu:

Koliko faza protkola je prikazano na slici?

U Kerberos protkolu pomocni tiket koji se koristi za pristup mreznim resursima sadrzi:

Tiketi u Kerberos protkolu su:

Alisa se autentifikovala pred Bobom preko digitalnog potpisa, ako Bob zeli takodje da se autentifikuje, koristice:

Razlog zbog cega server od klijenta trazi sertifikat u SSL protkolu je:

Autentifikacija moze biti zasnovana na necemu sto:

PFS podrazumeva:

Koji napadi su moguci na protkol sa slike:

Formulom na slici predstavljena je:

Glavni problem u WEP protokolu je;

U protkolu za autentifikaciju sa simetricnim kljucem:

Autentifikacija preko Kerberos protokola zasnovana je na:

Kerberos protokol za N broj korisnika generise:

Ukoliko je lozinka smislena i sastavljena na osnovu 256 ASCII karaktera:

Tehnika koja se koristi za proces segmentacije je:

Izabrati fizicke fenomene koje mogu da monitorisu uredjaj u sezonskim mrezama:

Postupak kreiranja digitalnog potpisa se sastoji iz dve faze. U drugoj fazi:

Sta je podrazumevano pod fazom za normalizaciju irisa?

Dizajn kog protokola je prikazan na slici?

U primeru kod VEB stranice www.amazon.com:

U protokolu za autentifikaciju sa vremenskim pecatom prvo:

Gde je primena WEP protkola?

Na slici Wynerovog wiretap kanala, R predstavlja:

Izabrati sloj kom pripada bezbednost na fizickom sloju:

Na slici je prikazana integracija sistema na:

U fazi kodovanja biometrije irisa koristi se transformacija:

Satelitski scenario nije moguc kada je:

Koja faza protokola je prikazana na slici?

Izabrati sloj kom pripada IPSec (Virtuelne privatne mreze):

Za implementaciju PFS u zastitni protkol, koristi se:

U protokolu za autentifikaciju sa javnim kljucem:

Satelitski scenario sluzi za razmenu:

Kriticna tacka Kerberos protkola je:

Nakon razmenjene specifikacije, u prvoj fazi SSL protkola:

Kod protokola za generisanje i distribuciju kljuceva na fizickom naviou, ako kapacitet tajnosti padne na nulu, tada: