Re: public-private key confusion

From: Marcel Martin (mm_at_ellipsa.net)
Date: 08/22/03

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    Date: Fri, 22 Aug 2003 06:25:46 +0200

    Michael Amling a écrit :
    >
    > aditya wrote:
    > > Hi
    > >
    > > Is it possible, to have multiple public keys for a single private key?
    >
    > Technically, yes, but why would you want to do that? You wouldn't
    > save much space.

    But like Douglas Gwyn 'said', this would be completely unsecure.
    Suppose you have e1 and e2 such that e1 <> e2 and such that a
    message encrypted with e1 or with e2 can be decrypted with the
    same exponent d. In that case, you can decrypt any message
    encrypted using the modulus N, i.e., not only encrypted with e1
    or e2 but with any e. In fact, you can even factor N.

    Marcel Martin

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