Re: encrypting and signing

From: Shaun Wilde (shaun_wilde_at_nospam.nospam)
Date: 04/08/05

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    Date: Fri, 8 Apr 2005 20:58:43 +0100

    Hi John

    I am not sure a second public/private key would be used.

    To sign a document you encypt the hash of the document using your private
    key.
    Then if someone wishes to check they would also calculate the hash and then
    use
    your public key to decrypt your previously encrypted has and compare the
    two.

    The only time I have used two public-private key pairs is in a key exchange
    over
    an insecure channel - though there are other ways.

    "John Grandy" <johnagrandy-at-yahoo-dot-com> wrote in message
    news:OHCNtQ8OFHA.3704@TK2MSFTNGP12.phx.gbl...
    > I understand the use of public/private keys for encrypting. Could someone
    > explain to me how a second public/private key pair is used for signing?
    > Thanks.
    >
    >

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