Asymmetric Cryptosystem Quiz! Trivia

2.

Public key encryption/decryption is not preferred because:

It is slow
it is hardware/software intensive
It has a high computational load
all of the mentioned

Correct Answer

A. all of the mentioned

Explanation

Public key encryption/decryption is not preferred because it is slow, hardware/software intensive, and has a high computational load. These factors make it less efficient and practical for certain applications.

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3.

CRL stands for

Cipher Reusable List
Certificate Revocation Language
Certificate Revocation List
Certificate Resolution Language

Correct Answer

A. Certificate Revocation List

Explanation

CRL stands for Certificate Revocation List. A Certificate Revocation List is a list of digital certificates that have been revoked by the issuing Certificate Authority (CA) before their expiration date. This list is used to check the validity of a digital certificate and ensure that it has not been revoked, ensuring the security and trustworthiness of the certificate.

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4.

It is desirable to revoke a certificate before it expires because:

the user is no longer certified by this CA
The CA’s certificate is assumed to be compromised
The user’s private key is assumed to be compromised
All of the mentioned

Correct Answer

A. All of the mentioned

Explanation

It is desirable to revoke a certificate before it expires because all of the mentioned reasons are valid. Revoking a certificate ensures that the user is no longer certified by the Certificate Authority (CA), which is important if the user's certification is no longer valid or trustworthy. Additionally, revoking a certificate is necessary if the CA's certificate is assumed to be compromised or if the user's private key is assumed to be compromised. Revoking the certificate in these cases helps to maintain the security and integrity of the certificate system.

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5.

We trust a digital certificate because it contains __________

Owner's public key
CA's public key
CA's signature
Owner's signature

Correct Answer

A. CA's signature

Explanation

A digital certificate is trusted because it contains the CA's signature. The CA (Certificate Authority) is a trusted entity that verifies the identity of the certificate owner and signs the certificate to confirm its authenticity. By including the CA's signature, the digital certificate ensures that it has been issued by a trusted authority, providing assurance that the certificate and its associated public key can be trusted for secure communication and authentication purposes.

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6.

In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?

P and q should be divisible by Ф(n)
P and q should be co-prime
P and q should be prime
P/q should give no remainder

Correct Answer

A. P and q should be prime

Explanation

The property of 'p' and 'q' in the RSA algorithm is that they should be prime. This is because the security of the RSA algorithm relies on the difficulty of factoring large composite numbers into their prime factors. By selecting 'p' and 'q' as prime numbers, it ensures that the factorization process is more challenging and helps to protect the encryption keys.

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7.

Perform encryption on the following PT using RSA and find the CT. p = 3; q = 11, e=3; M = 5

28
26
18
12

Correct Answer

A. 26

Explanation

The given question asks to perform encryption using RSA on the given plaintext (PT) and find the ciphertext (CT). The values of p and q are provided as 3 and 11 respectively, and the value of e is given as 3. The plaintext (M) is given as 5. To find the ciphertext, we need to calculate M^e mod (p*q), which is equivalent to 5^3 mod (3*11). Simplifying this expression, we get 125 mod 33, which is equal to 26. Therefore, the ciphertext (CT) is 26.

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8.

Which of the following is not an element/field of the X.509 certificates?

Issuer Name
Serial Modifier
Issuer unique Identifier
Signature

Correct Answer

A. Serial Modifier

Explanation

The Serial Modifier is not an element/field of X.509 certificates. X.509 certificates contain fields such as Issuer Name, Issuer Unique Identifier, and Signature, which are used for identifying and verifying the certificate. However, the Serial Modifier is not a recognized field in X.509 certificates.

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9.

Set {1, 2, 3, 9, 10, and 24} is superincreasing.

True
False

Correct Answer

A. False

Explanation

A set is considered superincreasing if each element in the set is greater than the sum of all the previous elements. In this case, the set {1, 2, 3, 9, 10, and 24} is not superincreasing because the last element, 24, is not greater than the sum of all the previous elements (1 + 2 + 3 + 9 + 10 = 25). Therefore, the correct answer is False.

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10.

In Merkle-Hellman Cryptosystem, the hard knapsack becomes the private key and the easy knapsack becomes the public key.

True
False

Correct Answer

A. False

Explanation

In Merkle-Hellman Cryptosystem, the easy knapsack becomes the private key and the hard knapsack becomes the public key.

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11.

To verify digital signature, we need the ________

Sender's private key
Sender's public key
Receiver's public key
Receiver's private key

Correct Answer

A. Sender's public key

Explanation

To verify a digital signature, we need the sender's public key. The sender uses their private key to create the digital signature, which is a unique cryptographic representation of the message. The receiver can then use the sender's public key to verify the digital signature and ensure that the message has not been tampered with. The public key is used for verification purposes, while the private key is kept secret by the sender to maintain the integrity and authenticity of the digital signature.

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12.

In Digital Signature, there is _____ relationship between signature and message.

Many to one
One to many
Many to many
One to one

Correct Answer

A. One to one

Explanation

In digital signature, there is a one-to-one relationship between the signature and the message. This means that a unique signature is generated for each specific message. The digital signature is created using the sender's private key and can only be decrypted using the corresponding public key. This ensures that the signature is unique to the message and verifies the authenticity and integrity of the message.

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0

13.

For the Knapsack: {1 6 8 15 24}, find the plain text code if the ciphertext is 38.

10010
01101
01001
01110

Correct Answer

A. 01101

Explanation

The given ciphertext is 38, and the corresponding plaintext code is 01101. This means that in the Knapsack {1 6 8 15 24}, the items with values 6, 15, and 24 were selected to form the ciphertext. By converting the binary representation of the selected items into plaintext, we get the code 01101.

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14.

A Registration Authority ___________ issue digital certificate.

Can
May or may not
Has to always
Can

Correct Answer

A. Can

Explanation

A Registration Authority can issue digital certificates. In the context of public key infrastructure (PKI), a Registration Authority (RA) is an entity responsible for verifying the identities of individuals or organizations requesting digital certificates. After performing the necessary verification steps, the RA can approve or reject the certificate request. If approved, the Certificate Authority (CA), which works closely with the RA, will issue the digital certificate. The digital certificate is a critical component in securing communications and transactions by verifying the identity of users, devices, or servers.

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0

15.

While creating a digital envelope, we encrypt the _ with the ____

Sender's private key, one time session key
Receiver's public key, one time session key
One time session key sender'spublic key
One time session key, receiver's public key

Correct Answer

A. One time session key, receiver's public key

Explanation

When creating a digital envelope, the one-time session key is encrypted with the receiver's public key. This ensures that only the intended receiver, who possesses the corresponding private key, can decrypt the session key and access the encrypted message. The use of a one-time session key adds an extra layer of security as it is only used for a single communication session and then discarded, reducing the risk of key compromise and unauthorized access to the message.

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Asymmetric CryptoSystem Quiz! Trivia

The _______of user should not appear on the digital certificate.

Quiz Preview

Public key encryption/decryption is not preferred because:

CRL stands for

It is desirable to revoke a certificate before it expires because:

We trust a digital certificate because it contains __________

In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?

Perform encryption on the following PT using RSA and find the CT. p = 3; q = 11, e=3; M = 5

Which of the following is not an element/field of the X.509 certificates?

Set {1, 2, 3, 9, 10, and 24} is superincreasing.

In Merkle-Hellman Cryptosystem, the hard knapsack becomes the private key and the easy knapsack becomes the public key.

To verify digital signature, we need the ________

In Digital Signature, there is _____ relationship between signature and message.

For the Knapsack: {1 6 8 15 24}, find the plain text code if the ciphertext is 38.

A Registration Authority ___________ issue digital certificate.

While creating a digital envelope, we encrypt the _ with the ____

Asymmetric CryptoSystem Quiz! Trivia

The _______of user should not appear on the digital certificate.

Quiz Preview

Public key encryption/decryption is not preferred because:

CRL stands for

It is desirable to revoke a certificate before it expires because:

We trust a digital certificate because it contains __________

In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?

Perform encryption on the following PT using RSA and find the CT. p = 3; q = 11, e=3; M = 5

Which of the following is not an element/field of the X.509 certificates?

Set {1, 2, 3, 9, 10, and 24} is superincreasing.

In Merkle-Hellman Cryptosystem, the hard knapsack becomes the private key and the easy knapsack becomes the public key.

To verify digital signature, we need the ________

In Digital Signature, there is _____ relationship between signature and message.

For the Knapsack: {1 6 8 15 24}, find the plain text code if the ciphertext is 38.

A Registration Authority ___________ issue digital certificate.

While creating a digital envelope, we encrypt the ___________ with the ______________

While creating a digital envelope, we encrypt the _ with the ____