COMPUTER NETWORKING

Detailed explanation-1: -Encryption-a process of encoding messages to keep them secret, so only “authorized” parties can read it. Decryption-a process that reverses encryption, taking a secret message and reproducing the original plain text.

Detailed explanation-2: -The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of three, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext.

Detailed explanation-3: -Ciphertext is encrypted text transformed from plaintext using an encryption algorithm. Ciphertext can’t be read until it has been converted into plaintext (decrypted) with a key. The decryption cipher is an algorithm that transforms the ciphertext back into plaintext.