Symmetric Block Cipher Modes: ECB, CBC, CFB, OFB, CTR

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5 Terms

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ECB (Electronic Codebook)

encrypts each block independently; leaks patterns (same plaintext block = same ciphertext block)

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CBC (Cipher Block Chaining)

XOR plaintext with previous ciphertext before encrypting; needs an IV for first block; hides patterns

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CFB (Cipher Feedback)

stream-like; encrypt previous ciphertext/IV to make a keystream chunk, then XOR with plaintext

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OFB (Output Feedback)

stream-like; repeatedly encrypt IV/output to make keystream, then XOR with plaintext; doesn't feed back ciphertext

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CTR (Counter Mode)

stream-like; encrypt nonce+counter to make keystream, then XOR; fast + parallel (blocks independent)