COMPUTER ETHICS AND SECURITY
CRYPTOGRAPHY AND ENCRYPTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Symmetric
|
|
|
Asymmetric
|
|
|
Block
|
|
|
Stream
|
Detailed explanation-1: -encryption – the process of converting plaintext to ciphertext (occasionally you may see it called ‘encipherment’) decryption – the process of reverting ciphertext to plaintext (occasionally ‘decipherment’).
Detailed explanation-2: -Block ciphers and stream ciphers are two separate methods of encrypting data with symmetric encryption algorithms: Encrypting information in chunks. A block cipher breaks down plaintext messages into fixed-size blocks before converting them into ciphertext using a key. Encrypting information bit-by-bit.
Detailed explanation-3: -Stream ciphers use an XOR operation on the plaintext to create ciphertext. Stream-based encryption is easily reversed by XORing the ciphertext outputs. Block ciphers encrypt more bits at a time, making the decryption comparatively complex.
Detailed explanation-4: -2.1 Synchronous stream ciphers. 2.2 Self-synchronizing stream ciphers.