Important Trivia Quiz On Cryptography

Explanation
Symmetric key encryption uses an identical key for both encryption and decryption. This means that the same key is used to transform plaintext into ciphertext during encryption, and then to transform the ciphertext back into plaintext during decryption. This type of encryption is also known as secret key encryption because the key used to encrypt the data must be kept secret and shared only between the sender and the intended recipient. The use of an identical key simplifies the encryption and decryption process, as both parties only need to know and use the same key.

Explanation
The correct answer is "shared." In practice, keys are often shared between two or more parties to establish a private information link. This means that the same key is known and used by all parties involved to encrypt and decrypt the information being shared, ensuring that only authorized individuals can access it. Sharing keys allows for secure communication and confidentiality between the parties involved.

Explanation
The algorithm used for symmetric key encryption is called the secret-key algorithm. This algorithm uses the same key for both encryption and decryption processes. It ensures that the information remains secure by keeping the key secret and known only to the sender and receiver. This symmetric key encryption algorithm is efficient and fast, making it suitable for applications that require secure communication and data protection.

Explanation
The major vulnerability of secret-key algorithms is the need for sharing the secret key. This means that in order for the algorithm to work, the secret key must be shared between the sender and the receiver. However, this sharing process can be a weak point in the security system, as it opens up the possibility of the key being intercepted or accessed by unauthorized individuals. Therefore, if the secret key is not securely shared, it can compromise the effectiveness and confidentiality of the secret-key algorithm.

Explanation
A cryptographic system that uses two keys, a public key known to everyone and a private key known only to the recipient of the message. The public key is used for encryption, allowing anyone to send encrypted messages to the recipient. The private key is used for decryption, ensuring that only the recipient can decrypt and read the messages. This two-key system provides a secure method of communication, as the private key remains secret and cannot be easily accessed by unauthorized individuals.

Explanation
The public key can be used to encrypt messages. Public key encryption is a cryptographic system that uses two keys: a public key for encryption and a private key for decryption. The public key is widely distributed and can be used by anyone to encrypt messages that can only be decrypted by the recipient who holds the corresponding private key. This ensures secure communication and confidentiality of the messages exchanged.

Explanation
The word "private" is the correct answer because it suggests that there is a key that can be used to decrypt something. The use of the word "private" implies that the key is exclusive and not accessible to everyone, further emphasizing its importance in the decryption process.

Explanation
The correct answer is asymmetric. In an asymmetric key encryption system, different keys are used for encryption and decryption. The public key, which is available to everyone, is used for encryption, while the private key, which is kept secret, is used for decryption. The fact that the public keys for intended users are published in phone directories and web pages suggests that this is an example of an asymmetric key encryption system.

Explanation
The word "public" is the correct answer because it is commonly used to describe keys that are widely available and accessible to the general public. These keys are typically published in various platforms such as phone directories, web pages, and advertisements for easy access and use by anyone who needs them.

Explanation
The given correct answer is "private, public". This is because in asymmetric encryption, also known as public-key encryption, two different keys are used for encryption and decryption. The private key is kept secret and is used for encryption, while the public key is freely available and is used for decryption. Therefore, the same technology can be used in reverse by encrypting with a private key and decrypting with a public key.