Remember ECB
Full name: Electronic Codebook
Memory aid: Equal plaintext Blocks get Equal ciphertext as the warning cue.
ECB reveals repeated-block patterns and is unsuitable for general message encryption.
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
ECB — Electronic Codebook
Encrypts each block independently with the same block-cipher key.
Why learn ECB — Electronic Codebook?
Encrypts each block independently with the same block-cipher key.
Where it came from
ECB reveals repeated-block patterns and is unsuitable for general message encryption.
- Memory aid (a learning cue, not the expansion): Equal plaintext Blocks get Equal ciphertext as the warning cue.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand ECB: Electronic Codebook.
- Recall this memory aid: Equal plaintext Blocks get Equal ciphertext as the warning cue.
- Explain the practical use: Encrypts each block independently with the same block-cipher key.
- Explain this distinction: ECB reveals repeated-block patterns and is unsuitable for general message encryption.
- Identify ECB in a device specification, architecture diagram, or system inventory.
Documentation and sources
- NIST block cipher modes (csrc.nist.gov)