본 논문에서는 블록 암호의 기본적인 동작 모드 중의 하나인 OFB 암호화 모드와 비동기식 IMT-2000의 무선 구간 메시지 암호화를 위해 사용되는 3GPP f8 암호화 모드의 안전성을 분석한다. Left-or-right 안전성 개념을 적용하여 각각 랜덤 함수 모델과 랜덤 치환 모델에서의 안전성에 대한 하한과 상한을 증명하고, 또한 유사랜덤 함수 모델과 유사 랜덤 치환 모델에서의 안전성을 각각 증명한다.
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