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  1. Jul 21st, 2004, 07:31 AM #1
    THEROB
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    RSA encrption Help

    Can someone please help me with understanding RSA encryption. Starting small I can encrypt and decrypt using:
    P = 11
    q = 3
    e = 3

    and
    p=17, q=11, e=7

    However when I try p = 257, q=263, e = 7, Letter for Encrption = R (ascii 82).
    I can't get it to work. I am using BigInt to do all of the math - attached is all of my code - can anyone tell where I have gone wrong

    Cheers

    Rob

    output:
    p=17, q=11, e=7
    N= 67591
    C=59156

    phi:67072
    d:38327
    C^d:433370372864891793361365563191187492639486140446836071782674040345154835633626032994202073684903 505243341240218748940410
    M:64415 - wrong
    Attached Files Attached Files
    Last edited by THEROB; Jul 21st, 2004 at 08:54 AM.
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