Terminology Index
Glossary
1801 terms
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B30
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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C2
