Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1989-02-24
1990-03-20
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 4, 380 21, 380 23, 380 29, 380 44, 380 49, H04K 100, H04K 900, H04L 902
Patent
active
049107763
ABSTRACT:
A host computer add on encryption/decryption printed circuit board includes address and control buffers, data buffer and board decode logic having input and output terminals selectively connected to the host computer and to first ports of a dual port random access memory (DPR) for storing a block of data and addresses and inputting portions of the block of data and addresses into the DPR's memory. A central processing unit (CPU) is connected to second ports of the DPR, and to a CPU RAM, CUP ROM, real time clock, key image buffer, and DES encryption device. The CUP pursuant to commands of the host computer fetches: (1) the encryption/decryption key of the key image buffer and information from the DPR for encryption/decryption by the encryption/decryption device; (2) the name from the host computer and date, time and length of access time for accumulating an audit trail stored in the key image buffer; and (3) file, auditor, and supervisor identification keys from key image buffer, and host computer for encryption and after comparison allowing access only to those files associated with these keys. In addition a system station key can be included for encryption and comparison for limiting user access only through an assigned station. A wait generator is connected to the CPU, real time clock and encryption/decryption device for clock synchronization of joint operations.
REFERENCES:
patent: 3764742 (1923-10-01), Abbott et al.
patent: 4123747 (1978-10-01), Lancto et al.
patent: 4262329 (1981-04-01), Bright et al.
patent: 4465901 (1984-08-01), Best
patent: 4503287 (1985-03-01), Morris et al.
patent: 4588991 (1986-05-01), Atalla
patent: 4670857 (1987-06-01), Rackman
patent: 4802217 (1989-01-01), Michener
patent: 4827508 (1989-05-01), Shear
Buczinski Stephen C.
MIU Automation
LandOfFree
Encryption printed circuit board does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Encryption printed circuit board, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Encryption printed circuit board will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-797902