Re: crypto flaw in secure mail standards

From: Richard Atterer (attererat_private-muenchen.de)
Date: Thu Jun 28 2001 - 04:46:39 PDT

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    There is another issue with the OpenPGP standard which should have
    been addressed a long time ago: The "Subject:" line is not encrypted
    for encrypted mail.
    
    Even *if* you know about this, it is inconvenient: You always try to
    find a subject which is still meaningful to the addressee, but not to
    anyone else.
    
    However, if a user does not know about this, it is a dangerous gap in
    PGP's security: In many cases, one can deduce the content of the
    encrypted mail from the subject header. PGP and MUAs with PGP support
    should either make it very clear that the subject is not encrypted, or
    (ideally) a facility for encrypted message headers should be added to
    OpenPGP.
    
      Richard
    
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