Remember CBC
Full name: Cipher Block Chaining
Memory aid: Cipher Blocks form a Chain.
CBC requires appropriate IV handling and a separate authentication strategy.
Study area: Cryptography & trust · Batch 8
Relevant study for: CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline · ISC2 SSCP · CompTIA SecurityX · Cybersecurity Architect SC-100 · ISC2 CCSP · Security, Compliance, and Identity Fundamentals SC-900
Practice with exam flashcards →Cybersecurity & Identity / Knowledge library
CBC — Cipher Block Chaining
Combines each plaintext block with prior ciphertext before block encryption.
Why learn CBC — Cipher Block Chaining?
Combines each plaintext block with prior ciphertext before block encryption.
Where it came from
CBC requires appropriate IV handling and a separate authentication strategy.
- Memory aid (a learning cue, not the expansion): Cipher Blocks form a Chain.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand CBC: Cipher Block Chaining.
- Recall this memory aid: Cipher Blocks form a Chain.
- Explain the practical use: Combines each plaintext block with prior ciphertext before block encryption.
- Explain this distinction: CBC requires appropriate IV handling and a separate authentication strategy.
- Identify CBC in a device specification, architecture diagram, or system inventory.
Documentation and sources
- NIST block cipher modes (csrc.nist.gov)