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[Author] Christopher PORTMANN(1hit)

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  • Information-Theoretic Secrecy with Access to Decryption Oracles

    Christopher PORTMANN  Keisuke TANAKA  

     
    LETTER-Cryptography and Information Security

      Vol:
    E94-A No:7
      Page(s):
    1585-1590

    We analyze the security notion of information-theoretic secrecy against an adversary who can make adaptive queries to the decryption oracle, and show that it is equivalent to requiring that the encryption scheme can perfectly encrypt +1 different messages. This immediately yields a lower bound on the key length and an optimal construction, namely (+1)-wise independent permutations. This also gives an operational interpretation to the notion of decryption oracles in information-theoretic security.