Cryptographic verification of operational keys used in communication networks

Patent 4193131 Issued on March 11, 1980. Estimated Expiration Date:

December 5, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3611293

3798605

3862716

Method and apparatus for preparing and assessing payment documents
Patent #: 3990558
Issued on: 11/09/1976
Inventor: Ehrat

On-line verification system for identification card or the like
Patent #: 4023013
Issued on: 05/10/1977
Inventor: Kinker

Location dependence for assuring the security of system-control operations Patent #: 4087856
Issued on: 05/02/1978
Inventor: Attanasio

Inventors

Application

No. 05/857546 filed on 12/05/1977

US Classes:

380/281, Using master key (e.g., key-encrypting-key)340/5.8, Authentication (e.g., identity)380/284, Using master key (e.g., key-encrypting-key)380/45, Multiple key level705/71, Including key management713/155Central trusted authority provides computer authentication

Examiners

Primary: Birmiel, Howard A.

Attorney, Agent or Firm

Lester; Edwin

International Classes

H04L 9/18 (20060101)
G07F 7/10 (20060101)

Abstract

In a data communication network providing communication security for communication sessions between a first station and a second station where each station has cryptographic apparatus provided with an operational key which should be common to both stations for cryptographic operations, an operational key verification arrangement is provided in which a first number provided at the first station is operated upon in accordance with the first station operational key to obtain cryptographic data for transmission to the second station, requiring the second station to perform an operation on the first station cryptographic data in accordance with the second station operational key to obtain cryptographic data for transmission back to the first station and performing an operation at the first station in accordance with the first number and the second station cryptographic data to verify that the second station is the source of second station cryptographic data only if the operational keys are identical.

Other References

Diffie et al., "New Directions in Cryptography," IEEE Transactions on Information Theory, vol. IT-22, No. 6, Nov. 1976, pp. 644-654
Diffie et al., "Multiuser Cryptographic Techniques," AFIPS Conference Proceedings, vol. 45, N.C.C., 1976, pp. 109-112