Patent Number: 7,788,479

Title: Apparatus, system and method of ensuring that only randomly-generated numbers that have passed a test are used for cryptographic purposes

Abstract: A method, system and apparatus for ensuring that only randomly generated numbers that have passed a test is used for cryptographic purposes are provided. When a random number is generated, it undergoes a built-in self-test (BIST). If the number passes the test, it is forwarded to a cryptographic device to be used for cryptographic purposes. If the number does not pass the test, a signal is instead forwarded to the cryptographic device to indicate the failure of the test. In a particular embodiment, only one data line is used to forward either the randomly generated number or the signal. A selector is used to facilitate the selection between the number and the signal.

Inventors: Ishii; Koji (Shiga, JP)

Assignee: International Business Machines Corporation

International Classification: H04L 9/26 (20060101); H04L 9/20 (20060101); H04L 29/00 (20060101)

Expiration Date: 8/31/12018