Source: wikibot/block-cipher
= Block cipher
{wiki=Block_cipher}
A **block cipher** is a type of symmetric encryption algorithm that processes data in fixed-size blocks (usually 64, 128, or 256 bits) of plaintext, transforming them into blocks of ciphertext of the same size. This method allows for secure data encryption by employing a secret key for both encryption and decryption operations. \#\#\# Key Features of Block Ciphers: 1. **Fixed Block Size**: Data is divided into blocks of a specific size.