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RFC 5091, "Identity-Based Cryptography Standard (IBCS) #1: Supersingular Curve Implementations of the BF and BB1 Cryptosystems", December 2007

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: sec
See Also: RFC 5091w/ inline errata

Errata ID: 2739
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: David Núñez (University of Málaga)
Date Reported: 2011-02-27
Verifier Name: Sean Turner
Date Verified: 2011-07-25

Section 4.2.1 says:

The value of b MUST be less than 
or equal to the number of bytes in the output of hashfcn

It should say:

The value of b MUST be greater than 
or equal to the number of bytes in the output of hashfcn

Notes:

If b is less than or equal to hashlen, then the result of the fourth step of the algorithm would always be 1, since the division will result in a number between 0 and 1.

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