Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1990-12-20
1992-08-04
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 30, 380 25, H04K 100
Patent
active
051366436
ABSTRACT:
A time notarization apparatus and method is disclosed which uses a secure, microprocessor based hardware platform which performs public key crytographic operations to obtain trusted time stamping with a minimum of intervention by third parties. The hardware platform is encapsulated in a secure fashion so that the device's timestamping mechanism may not be readily tampered with or altered. The hardware platform includes at least one digital clock and a stable, secure storage device to record the private half of a public/private key pair. Coupled to both the digital clock and the storage device is a data processing device which performs public key signature operations in a secure and tamper-proof manner. Only the processing device has access to the secure storage device and its associated private key. The hardware platform also includes input/output means which receives a digital message which is to be digitally signed and timestamped and which outputs the resulting timestamped signature generated by the device. The hardware platform also includes a power source, (e.g., on on-board battery) to ensure the accuracy of the device's digital clock and the security of storage data prior to installation or in case of a power failure.
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Cain David
Tarcza Thomas H.
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