Encrypted communication system that limits the damage caused whe

Details Encrypted communication system that limits the damage caused whe Encrypted communication system that limits the damage caused whe

1997-09-30

2000-11-21

Swann, Tod R.

Cryptography

Key management

Key distribution

380278, 380277, 380 43, H04L 900

Patent

active

061513946

ABSTRACT:
In an encrypted transmission system composed of one transmission apparatus 10 and twenty-eight reception apparatuses A1-G4 that are classified into seven groups A-G, two secret key exclusively selected out of a total of fourteen secret keys are distributed beforehand to each group. The transmission apparatus 10 encrypts the same message M using one of the two secret keys distributed to each group and sends each group a message M encrypted with one of the group's secret keys. The reception apparatuses each decrypt the received cryptogram separately using each of the secret keys assigned to the of group to which each reception apparatus belongs, judge whether either of the two decryption results conforms to a predetermined rule, and specify the correct decryption result.

REFERENCES:
patent: 4197502 (1980-04-01), Sumner et al.
patent: 4440976 (1984-04-01), Bocci et al.
patent: 4771459 (1988-09-01), Jansen
patent: 4782326 (1988-11-01), Bush
patent: 5390247 (1995-02-01), Fischer
patent: 6009174 (1999-12-01), Tatebayashi et al.

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