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.
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