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Re: [Cfrg] e=3 a bad idea?

Wan-Teh Chang <wtchang@redhat.com> Wed, 20 September 2006 14:03 UTC

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Date: Wed, 20 Sep 2006 07:03:59 -0700
From: Wan-Teh Chang <wtchang@redhat.com>
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Subject: Re: [Cfrg] e=3 a bad idea?
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You may want to cite the following in the BCP.

The draft revision of the US Federal digital signature
standard, Draft FIPS 186-3, requires that the RSA public
exponent e be an odd positive integer >= 65,537.
See Appendix B.3.1 Criteria for IFC Key Pairs on p. 61:

   (b) The exponent e shall be an odd positive integer such that
           65,537 <= e < 2**(nlen - 2*security_strength)
       where nlen is the length of the modulus n in bits.

http://csrc.nist.gov/publications/drafts.html#fips186-3
http://csrc.nist.gov/publications/drafts/fips_186-3/Draft-FIPS-186-3%20_March2006.pdf

Wan-Teh


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