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RFC 4226, "HOTP: An HMAC-Based One-Time Password Algorithm", December 2005

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: sec
See Also: RFC 4226 w/ inline errata

Errata ID: 163
Status: Verified
Type: Editorial
Publication Format(s) : TEXT

Reported By: M'Raihi, David
Date Reported: 2005-12-26

Section 9 says:

   Oracle AuthO()
   --------------
      A = ALG(K,C)
      C = C + 1
      Return O to B

It should say:

   Oracle AuthO()
   --------------
      A = ALG(K,C)
      C = C + 1
      Return A to B
             ^^

Notes:


Section A.4.1, Paragraph 3, Lemma 1 definition, top of page 19

The description of Lemma 1 defines P_ {N,m} (z) using the term Z_ {n}
and it should actually be Z_ {N}.
P_{N,m}(z) = Pr [x mod m = z : x randomly pick in Z_{n}]
Should be:
P_{N,m}(z) = Pr [x mod m = z : x randomly pick in Z_{N}]
^^^

Section E.2, Paragraph 4, bottom of page 32
32^8 > 10^12 so the security of an 8-alphanumeric HOTP code is
significantly better than a 9-digit HOTP value.
Should be:
32^8 > 10^12 so the security of an 8-alphanumeric HOTP code is
significantly better than a 12-digit HOTP value.
^^

In Author's Addresses, Page 35, David Naccache's contact information should be:

David Naccache
ENS, DI
45 rue d'Ulm
75005 Paris, France
and
Information Security Group,
Royal Holloway,
University of London, Egham,
Surrey TW20 0EX, UK

EMail: david.naccache@ens.fr, david.naccache@rhul.ac.uk

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