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Math Help - reverse

  1. #1
    Newbie
    Joined
    Aug 2007
    Posts
    11

    reverse

    f(s, p) is a function that encrypts s with p[password]
    g(s, p) is a function that decrypts s with p[password]
    f(s, p) NOT= f(p, s) and g(s, p) NOT= f(p, s)
    e.g.
    if X = f(s, p) then s = g(X, p)
    -------------------------------
    after encryption abcd becomes IJKL where
    I = f(a, p)
    J = f(I, c)
    K = f(J, d)
    L = f(d, p)
    -----------------------------
    Now I know only IJKL, and p
    Its easy to decrypt a and d but How can I decrypt b and c ??
    Is it possible ??
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  2. #2
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    Aug 2007
    Posts
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    There is no way of finding b but what about others ??
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