What is a Block Cipher?

A Block Cipher is a symMetric cryptographic Algorithm that operates on a fixed-size bLock of inFormation the usage of a shared, mystery key. Plaintext is used all through the Encryption, and the resulting encrypted text is called a ciphertext. The same secret is used for each the encryption of the plaintext and the Decryption of the ciphertext.

What Does Block Cipher Mean?

Block cipher encrypts/decrypts its input one block at a time in preference to one bit at a time the use of a shared, mystery key. The block is fixed in size; otherwise, padding is necessary. This algorithm is symmetric. During encryption, it Makes use of the shared key to convert its plaintext enter right into a cyphertext (encrypted textual content). During decryption, it uses the equal key to transform the cyphertext again to the unique plaintext. The period of the Output is similar to the input.

Well-recognized Implementations of the block cipher algorithm are the Data Encryption Standard (DES), TripleDES and the Advanced Encryption popular (AES).

The counterpart of block cypher is the circulate cypher, which operates on its input one bit at a time, additionally the usage of a shared key.

An opportUnity to the block cipher set of rules is Public-key Cryptography or uneven cryptography. This set of rules uses a Public Key to encrypt plaintext and a non-public key to decrypt the ensuing ciphertext.