COMPUTER FUNDAMENTALS

Detailed explanation-1: -Block Cipher is the type of encryption where the conversion of plaintext is performed by taking its block at a time. Stream Cipher is the type of encryption where the conversion of plaintext is performed by taking one byte of the plaintext at a time.

Detailed explanation-2: -An important distinction in symmetric cryptographic algorithms is between stream and block ciphers. Stream ciphers convert one symbol of plaintext directly into a symbol of ciphertext. Block ciphers encrypt a group of plaintext symbols as one block. Simple substitution is an example of a stream cipher.

Detailed explanation-3: -Electronic codebook (ECB) The message is divided into blocks, and each block is encrypted separately. The disadvantage of this method is a lack of diffusion. Because ECB encrypts identical plaintext blocks into identical ciphertext blocks, it does not hide data patterns well.

Detailed explanation-4: -Block cipher and stream cipher are members of the family of symmetric key ciphers, essentially encryption techniques used for directly transforming the plaintext into ciphertext.