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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: 2738
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 4.1.1 says:

The input n MUST 
be less than 2^(hashlen), where hashlen is the number of octets 
comprising the output of the hash function hashfcn. 

It should say:

The input n MUST 
be less than 256^(hashlen), where hashlen is the number of octets 
comprising the output of the hash function hashfcn.

Notes:

Since hashlen is the output size in bytes of the hash function, the correct limit is 256^hashlen.

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