The Laws of Cryptography:
Verhoeff's Decimal Error Detection

by Neal R. Wagner

Copyright © 2002 by Neal R. Wagner. All rights reserved.

NOTE: This site is obsolete. See book draft (in PDF):

Law DECIMAL2: It is possible to use a single check digit to detect all single errors and all adjacent transpositions, and nobody uses this method.

Revision date: 2001-12-26. (Please use ISO 8601, the International Standard.)