[10390] in cryptography@c2.net mail archive
Re: Welome to the Internet, here's your private key
daemon@ATHENA.MIT.EDU (Dean Povey)
Tue Feb 5 11:39:53 2002
From: Dean Povey <povey@dstc.qut.edu.au>
To: Greg Rose <ggr@qualcomm.com>
Cc: Bill Frantz <frantz@pwpconsult.com>,
cryptography@wasabisystems.com
Message-ID: <C1256B57.00558EE8.00@>
Date: Tue, 5 Feb 2002 03:34:21 +0000
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>At 04:24 PM 2/4/2002 -0800, Bill Frantz wrote:
>>At 2:09 PM -0800 2/4/02, lynn.wheeler@firstdata.com wrote:
>> >1) A typical message would have a 20-byte nonce random number, which
>> >computed to a 20-byte SHA1 and then encrypted with RSA resulting in 20-byte
>> >signature (basic message plus 40-byte infrastructure overhead, signature
>> >plus nonce).
>
>I think an RSA signature can be no smaller than the key modulus, so an RSA
^^^^^^^ larger
>sig with a 1024-bit key is going to be 128 bytes plus some overhead, no
>matter what. I think you (Lynn) meant DSA here. Or maybe you did mean RSA,
>given that you then go on to DSA... I don't know.
But the analysis still holds of course, the modulus is just an upper
bound, and this is just me being pedantic.
--
Dean Povey, |em: dpovey@wedgetail.com| JCSI: Java security toolkit
Senior S/W Developer |ph: +61 7 3864 5120 | uPKI: Embedded/C PKI toolkit
Wedgetail Communications |fax: +61 7 3864 1282 | uASN.1: ASN.1 Compiler
Brisbane, Australia |www: www.wedgetail.com | XML Security: XML Signatures
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