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Math Help - Cryptography Help

  1. #1
    Newbie
    Joined
    Jul 2008
    Posts
    1

    Cool Cryptography Help

    Hi I have stuck at these two exercises ...

    1)
    Suppose we use the Rabbin protocol and we have chosen p=31,q=51 and B=15. If we want to transmit the message M=20 which will be the encrypted message C?? Also what are the messages the recipient will receive decrypting C ??

    2)
    Suppose we work in RSA and Alice has the public key (n,e)=(667,3). Suppose m1=26, m2=46, and the signature of Alice in m1 is sig(m1). We want to find sig(m2). We have the right to give her a message x, x different from m2 and she will sign it. We can't use the factoring of 667 neither can we find the d from e=3. What message should we give her???


    thnx a lot xxx
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  2. #2
    Newbie
    Joined
    May 2008
    Posts
    4

    help needed

    +1

    any help would be very much appreciated
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