Data communication system

Details Data communication system Data communication system

1991-11-29

1993-04-13

Swann, Tod

Cryptography

Key management

Having particular key generator

380 21, 380 22, 380 23, H04L 902

Patent

active

052029220

ABSTRACT:
When a final session is performed between a host device and an IC card, common key data stored in the host device is encrypted by an updated session key and transmitted to the IC card in which the encrypted common key data is decrypted by the the same updated session key to obtain the common key data which is stored in the IC card for the following sessions to be performed later.

REFERENCES:
patent: 4799061 (1989-01-01), Abraham et al.
patent: 4876716 (1989-10-01), Okamoto
patent: 4888800 (1989-12-01), Marshall et al.
patent: 4933971 (1990-06-01), Bestock et al.
patent: 5109152 (1992-04-01), Takagi et al.

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