ElGamal signature encoding

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Werner Koch (wk@isil.d.shuttle.de)
Fri, 3 Apr 1998 11:52:58 +0200

Hi,

I'm the author of the GNU Privacy Guard, a free PGP replacement.

I'm using ElGamal signatures and wondering what are the advantages of
packing the Hash into a structure of FF-padding, an ASN-OID and the Hash
(this is the way PGP does it). None of the values aside of the Hash
are used because the Hash algorithm is known from other fields in the
packet. The big drawback is, that I have to do the calculation on a (say)
1024 bit number instead of an 160 bit number (the Hash) - PGP 5 only uses
the 160 bit Hash (due to DSA).

Any comments? 

-- 
Werner                      (finger gcrypt@ftp.guug.de for info about GnuPG)

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The following archive was created by hippie-mail 7.98617-22 on Fri Aug 21 1998 - 17:16:50 ADT