Fair cryptosystems and methods of use
April 19, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDatabase encryption and decryption circuit and method using subkeys Cryptographic communications system and method Variants of the fiat-shamir identification and signature scheme Method of bonding copper and resin Method for electronic transaction with digital signature Public/key date-time notary facility Cryptographic system allowing encrypted communication between users with a secure mutual cipher key determined without user interaction Method for generating a public key Method and apparatus for validating entry of cryptographic keys Fair cryptosystems and methods of use Patent #: 5276737 InventorApplicationNo. 049929 filed on 04/19/1993US Classes:380/286, Key escrow or recovery380/28, PARTICULAR ALGORITHMIC FUNCTION ENCODING380/30, Public key713/176, Authentication by digital signature representation or digital watermark713/180Generating specific digital signature type (e.g., blind, shared, or undeniable)ExaminersPrimary: Swann, Tod R.Attorney, Agent or FirmInternational ClassH04K 001/00AbstractA method, using a public-key cryptosystem, for enabling a predetermined entity to monitor communications of users suspected of unlawful 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 communications of a user suspected of unlawful activity, 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 suspect user's communications.Other References
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