Patent ID: 6748535
Filing Date: 2004-06-08
Classification: G06F,G07B

Abstract:
A method of limiting conducted emissions by a cryptographic device performing cryptographic operations, said cryptographic device comprising an integrated circuit having a secure housing, said integrated circuit performing at least a portion of said cryptographic operations, the method comprising the steps of:providing power to said integrated circuit from a first power source, said first power source being external to the secure housing locating a second power source within said secure housing for said integrated circuit, said second power source forming part of said integrated circuit; isolating at least a part of said integrated circuit from said first power source during at least a part of said portion of said cryptographic operations; and providing power to said at least a part of said integrated circuit from the second power source at least part of the time when said integrated circuit is performing said at least a part of said portion of said cryptographic operations.