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Block Ciphers

Symmetric encryption algorithms that encrypt data in fixed-size blocks, such as AES with its 128-bit blocks. They are a fundamental building block of modern encryption when combined with a mode of operation.

A block cipher transforms a fixed-size plaintext block into a ciphertext block under a key, and must be paired with a mode of operation to handle real-world data of arbitrary length. Block ciphers contrast with stream ciphers, which encrypt data continuously, and AES is the dominant example.

Introduced in: Cryptography Essentials

Examples

  • AES encrypting data in 128-bit blocks under a secret key.
  • Combining a block cipher with GCM mode for authenticated encryption.
  • Choosing a block cipher for disk or file encryption.

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