Fair cryptosystems and methods of use

Details Fair cryptosystems and methods of use Fair cryptosystems and methods of use

1995-09-12

1998-05-26

Cain, David C.

Cryptography

Particular algorithmic function encoding

Public key

380 23, 380 25, H04K 100

Patent

active

RE0358088

ABSTRACT:
A method, using a public-key cryptosystem, for enabling a predetermined activities while protecting the privacy of law-abiding users.!., wherein each user is assigned a pair of matching secret and public keys. According to the method, each user's secret key is broken into shares. Then, each user provides a plurality of "trustees" pieces of information. The pieces of information provided to each trustee enable that trustee to verify that such information includes a "share" of a secret key of some given public key. Each trustee can verify that the pieces of information provided include a share of the secret key without interaction with any other trustee or by sending messages to the user. Upon a predetermined request or condition, e.g., a court order authorizing the entity to monitor the trustees reveal to the entity the shares of the secret key of such user. This enables the entity to reconstruct the secret key and monitor the

REFERENCES:
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patent: 5005200 (1991-04-01), Fischer
patent: 5018196 (1991-05-01), Takaragi et al.
patent: 5136643 (1992-08-01), Fischer
patent: 5150411 (1992-09-01), Maurer

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