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  1. Junior Member
    Join Date
    Mar 2009
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    Tennessee
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    #1

    Default PKI concept trouble.

    I've got the theory down pat, I don't question the veracity of the material, but I still don't quite grasp how it works.

    PKI - User JohnDoe Public Key: A10 Private Key: A1010
    User SmithySmith Public Key: A20 Private Key: A2020

    According to most PKI conceptual material I've read, user JohnDoe would encrypt a message going to SmithySmith with SmithySmith's PUBLIC KEY. When SmithySmith receives this message, he will then DECRYPT it with his mathematically-similar Private Key.

    How in the hell do you decrypt a message with a key it was not encrypted with. I understand it is mathematically similiar, but if the decryption algorithm compensated for this, then wouldnt the whole encyption process just be bunk, as the encyption scheme is known?
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  2. Senior Member broc's Avatar
    Join Date
    Oct 2009
    Location
    London
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    CISSP, CCSP, CCNP, CCDA, MCTIP:EA
    #2
    You need to read about Asymmetric Encryption. http://en.wikipedia.org/wiki/Public-key_cryptography
    Last edited by broc; 03-11-2010 at 08:38 PM. Reason: grammar
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