비밀키 암호화 기법과 공개키 암호하 기법에 대하여
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작성일 12-01-30 17:33
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비밀키 암호화 기법
- 동일한 키로 데이터를 암호화하고 복호화한다.
- 복호화 키를 아는 사람은 누구든지 암호문을 복호화할 수 있으므로 복호화 키의 비밀성을 유지하는 것이 중요하다.
- 비밀키 암호화 기법은 대칭 암호화 기법 또는 단일키 암호화 기법이라고도 하며, 대표적으로 DES(Data Encryp tion Standard)가 있다.
- 장점 : 암호화/복호화 속도가 빠르며, 알고리즘이 단순하고 파일 크기가 작다.
- 단점 : 사용자의 증가에 따라 관리해야 할 키의 수가 상대적으로 많아진다.
공개키 암호화 기법
- 서로 다른 키로 데이터를 암호화하고 복호화한다.
- 데이터를 암호화할 때 사용하는 키(공개키, Public key)는 공개하고, 복호화할 때의 키(비밀키, Secret key)는 비밀로 한다.
- 공개키 암호화 기법은 비대칭 암호화 기법이라고도 하며, 대표적으로 RSA(Rivest Shamir Adleman)가 있다.
- 장점 : 키의 분배가 용이하고, 관리해야 할 키의 개수가 적다.
- 단점 : 암호화/복호화 속도가 느리며, 알고리즘이 복잡하고 파일 크기가 크다.
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