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Thread: E changed to 1 in RSA algo.

  1. #1
    Problem
    Guest

    E changed to 1 in RSA algo.

    I heard that DAMN changed e to 1 in ffxp to crack it, yes i know e is the public exponent but how it helps changing it to 1 ?

    tnx
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  2. #2
    DakienDX
    Guest
    Hello Problem (we all have them, don't we?) !

    Very easy!

    M = C^E mod N (C = ciphertext, M = message)
    and
    C = M^D mod N (C = ciphertext, M = message)

    We don't know D and it's very difficult to get D in reasonable time.
    We know E.

    So if we change E to 1, D must be 1 too and we have

    M = C mod N
    and
    C = M mod N

    and so we have C = M if M < N.
    I promise that I have read the FAQ and tried to use the Search to answer my question.

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