| 5832089 |
Off-line compatible electronic cash method and system |
| Nov-3-1998 |
An off-line electronic cash system having an electronic coin, a bank B, a payee S, and a user U with an account at the bank B as well as a user password z.sub.u,i, has a method for performing an electronic... |
| 5812670 |
Traceable anonymous transactions |
| Sep-22-1998 |
Encryption is a common tool to achieve privacy of communication in networks whose lines are not physically protected. In most communication networks, however, having a sender S send an encrypted message... |
| 5790665 |
Anonymous information retrieval system (ARS) |
| Aug-4-1998 |
An information retrieval system in which data is retrieved anonymously by a user with the assistance of one or more trusted agents. |
| 5781631 |
Limited-traceability systems |
| Jul-14-1998 |
Cryptographic methods and apparatus for payment and related transaction systems are disclosed that allow some kinds of tracing under some conditions and make substantially infeasible other kinds of tracing... |
| 5768391 |
System and method for ensuring user privacy in network communications |
| Jun-16-1998 |
A system and method for ensuring user privacy in a messaging system where a message is sent from a sender to a recipient via a service provider. Information pertaining to the identification of a sender... |
| 5768385 |
Untraceable electronic cash |
| Jun-16-1998 |
An electronic cash protocol including the steps of using a one-way function f.sub.1 (x) to generate an image f.sub.1 (x.sub.1) from a preimage x.sub.1 ; sending the image f.sub.1 (x.sub.1) in an unblinded... |
| 5754938 |
Pseudonymous server for system for customized electronic identification of desirable objects |
| May-19-1998 |
This invention relates to customized electronic identification of desirable objects, such as news articles, in an electronic media environment, and in particular to a system that automatically constructs... |
| 5754656 |
Electronic shopping method, electronic shopping system and document authenticating method relating thereto |
| May-19-1998 |
An electronic shopping method is provided by both an apparatus 10 and an apparatus 30 to hold a key K(A, C) in common, and both the apparatus 30 and an apparatus 40 to hold a key K(B, C) in common. The... |
| 5729537 |
Method and apparatus for providing anonymous data transfer in a communication system |
| Mar-17-1998 |
A method, and associated apparatus, of providing a communication station with anonymous access to a communication network to communicate data therein. Access is provided to the communication station only... |
| 5712913 |
Limited-traceability systems |
| Jan-27-1998 |
Cryptographic methods and apparatus for payment and related transaction systems are disclosed that allow some kinds of tracing under some conditions and make substantially infeasible other kinds of tracing... |
| 5577120 |
Method and apparatus for restrospectively identifying an individual who had engaged in a commercial or retail transaction or the like |
| Nov-19-1996 |
Individuals are provided with a transaction card which is to be presented for at least certain classes of transactions, e.g., truck rentals, purchases of chemicals, etc. Encoded electronically within the... |
| 5557518 |
Trusted agents for open electronic commerce |
| Sep-17-1996 |
A system for open electronic commerce having a customer trusted agent securely communicating with a first money module, and a merchant trusted agent securely communicating with a second money module. Both... |
| 5511121 |
Efficient electronic money |
| Apr-23-1996 |
A unique electronic cash system protects the privacy of users in legitimate transactions while at the same time enabling the detection of a double spender of the same electronic coin. The electronic cash... |
| 5485520 |
Automatic real-time highway toll collection from moving vehicles |
| Jan-16-1996 |
One or more roadside collection stations (RCS) communicate over a short-range, high speed bidirectional microwave communication link with one or more in-vehicle units (IVU) associated with one or more... |
| 5420926 |
Anonymous credit card transactions |
| May-30-1995 |
Techniques for performing credit-card transactions without disclosing the subject matter of the transaction to the institution providing the credit card. The techniques include the use of a communications... |
| 5276736 |
Optionally moderated transaction systems |
| Jan-4-1994 |
A tamper-resistant part is disclosed that can conduct transactions with an external system through a moderating user-controlled computer or that can on other occasions be brought into direct connection... |
| 4969189 |
Authentication system and apparatus therefor |
| Nov-6-1990 |
In the case where a prover A proves the validity of a pretender B to a verifier C, B receives an initial response x' created by A, randomizes it with a random component and sends it as x", and randomizes... |
| 4926480 |
Card-computer moderated systems |
| May-15-1990 |
A user controlled card computer C and communicating tamper-resistant part T are disclosed that conduct secure transactions with an external system S. All communication between T and S is moderated by C,... |
