Last Updated
：2025/12/06
known-plaintext attack
Noun
Japanese Meaning
既知平文攻撃: 暗号システムに対する攻撃の一種で、攻撃者が暗号文だけでなく、対応する平文（クリブ）も既知であるという情報を利用し、システムの鍵や内部構造を解読しようとする手法。暗号文のみの攻撃より効果的だが、選択平文攻撃ほどの柔軟性はない。
Sense（1）
（ plural ）
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(cryptography) An attack on a cryptosystem that relies on the attacker's knowledge of not just some ciphertexts encrypted with that system and key, but also their corresponding plaintexts (cribs). More powerful than a ciphertext-only attack, but less powerful than a chosen-plaintext attack.
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known-plaintext attack
The security team detected a known-plaintext attack after finding several ciphertexts paired with their original messages.
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The security team detected a known-plaintext attack after finding several ciphertexts paired with their original messages.
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