APPARATUS FOR AND METHOD OF CONTROLLING PROPAGATION OF DECRYPTION KEYS
Application 448/KOLNP/2004 published 2006-04-14, filed 2004-04-02
n encryption key propagation control system is provided in which a generation umber (72) is identified with each decryption key and the generation number is ueried each time a request is made to forward a decryption key to another user. The eneration number is decremented at each request, and once it reaches a zero further quests are refused by the system. (FIG. – 5a & b)
Applicant
DATA ENCRYPTION SYSTEMS LIMITED
SILVER STREET, HOUSE SILVER STREET, TAUNTON SOMERSET TA1 3DL GB
Inventor
1) TOMLINSON DAVID ROBIN
International Info
Classification: G06F 1/00
Publication Number: WO 03/021400 A2
Application Date: 2002-08-22
Priority Information
0121502.9 GB 2001-09-05