1. International Organization for Standardization Genève Switzerland‘Information technology-Security techniques-Key management; Part 3: Mechanisms using asymmetric techniques’, ISO/IEC 2nd DIS 11770-3, July 1997
2. International Organization for Standardization Genève Switzerland‘Information technology-Security techniques-Key management-Part 2: Mechanisms using symmetric techniques’, ISO/IEC 11770-2, 1996