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5745573 |
System and method for controlling access to a user secret
A system and method for data escrow cryptography are described. An encrypting user encrypts a message using a secret storage key (KS) and attaches a data recovery field (DRF), including an access...
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5745398 |
Method for the implementation of modular multiplication according to the Montgomery method
A method for the implementation of modular multiplication according to the Montgomery method, wherein a multiplicand A and a multiplier B are encoded respectively on a and b words of k bits, the...
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5745571 |
Cryptographic communications method and system
A method for loading secret data, such as an application key, on a smart card (6), which involves storing a random key on the card (6), encrypting the random key on the basis of a public key, and...
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5742682 |
Method of manufacturing secure boxes in a key management system
A method of manufacturing a secure box in a Key Management System that includes a plurality of functionally distinct secure boxes initializes a first manufacturing box if one does not exist. The...
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5740250 |
Tame automorphism public key system
The present invention relates to a tame automorphism based encryption system or scheme. Let K be a finite field of 2 m elements. Let .o slashed. 4 ,.o slashed. 3 ,.o slashed. 2 , .o slashed. 1 be...
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5740246 |
Crypt key system
The present invention provides a concrete structure for applying a crypt key system to a television system, a database system or an electronic commercial transaction system or the like. This system...
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5737419 |
Computer system for securing communications using split private key asymmetric cryptography
A programmed computer secures communications between users of a crypto-system in which each user has an associated asymmetric crypto-key with a public key portion accessible to all system users and...
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5737425 |
Cryptosystem employing worst-case difficult-to solve lattice problem
A cryptosystem and cryptographic method are provided for performing tasks such as encoding/decoding, signing messages, and verifying identity. The system and method employ a problem which is...
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5734718 |
NIS+ password update protocol
The present invention provides methods and apparatus for updating passwords in a name service system. A server includes a name service database that further includes a plurality of tables with...
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5734720 |
System and method for providing digital communications between a head end and a set top terminal
A system and method for scheduling the receipt of desired movies and other forms of data from a network. Feedback paths are provided so that customer's profiles and/or the profiles of the video...
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5729608 |
Method and system for providing secure key distribution in a communication system
A method and system for providing secure authenticated cryptographic key distribution in a communication system having properties very similar to a Two-Party Authentication Protocol. A new group...
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5724425 |
Method and apparatus for enhancing software security and distributing software
Source code to be protected, a software application writer's private key, along with an application writer's license provided to the first computer. The application writer's license includes...
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5721779 |
Apparatus and methods for verifying the identity of a party
Apparatus for verifying the identity of a party are disclosed, the apparatus including a database memory that stores a password signal encrypted by operation of a one-way commutative function; a...
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5720034 |
Method for secure key production
A method for exchanging a secure slave key between an agent and a manager which are connected by an unsecured digital computer network. A master key is provided, which is known to both the manager...
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5719940 |
Method for providing information security by exchanging authentication and signing an electronic signature and apparatus therefor
A method for exchanging an authentication and signing an electronic signature, capable of providing a high security and achieving a high efficiency. The method includes the steps of setting p, q...
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5717759 |
Method for certifying public keys in a digital signature scheme
A method for certifying public keys of a digital signature scheme in a communications system is provided. The secure communications system is one in which there are at least two levels of...
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5717758 |
Witness-based certificate revocation system
An intermediary provides certificate information by receiving from a first other entity authenticated certificate information, processing at least a portion of the authenticated certificate...
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5717757 |
Certificate issue lists
An authority provides authenticated information about a plurality of certificate identifiers by generating a data string identifying all the plurality of certificate identifiers and by having the...
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5712800 |
Broadcast key distribution apparatus and method using chinese remainder
A communication system utilizing low bandwidth requirements for transmitting an encoded value formulated using the Chinese Remainder procedure to receivers having a private key. The system offers...
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5710817 |
Method and device for preventing unauthorized access to a computer system
In a method and a device for preventing unauthorised access to a computer system comprising at least one processing unit (1) or like, a disk unit (3), a display (5), and a keyboard (7), use is made...
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5708709 |
System and method for managing try-and-buy usage of application programs
A system and method for managing the distribution of licensed application programs stored on a server over a distributed computer system maintains control over the program even after the program...
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5708714 |
Method for sharing secret information and performing certification in a communication system that has a plurality of information processing apparatuses
The object of the present invention is to perform verifiable secret sharing by a practical amount of calculation and a practical amount of communication. In addition, by using this process, a...
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5699431 |
Method for efficient management of certificate revocation lists and update information
A method which allows implementation of the revocation of public-key certificates facilitates engineering of certificate revocation lists (CRLs). It solves the practical problem of CRLs potentially...
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5696827 |
Secure cryptographic methods for electronic transfer of information
Cryptographic methods and apparatus are disclosed relating to practical cryptographic systems for electronic transfer of information. Specifically, inventive techniques are described to allow the...
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5694471 |
Counterfeit-proof identification card
A system and method for preventing counterfeiting of an identification or transaction card, and for verifying that the user of the card is an authorized user, involves the use of a unique,...
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5689567 |
Electronic signature method and apparatus
Electronic signature apparatus and method provide an electronic signature that can be created only by a signer, but cannot be used for other than the signature object document to be processed, and...
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5687235 |
Certificate revocation performance optimization
The present invention is an improved certificate revocation process that improves the efficiency of an authentication exchange in a public key distributed network system. Specifically, the present...
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5682430 |
Secure anonymous message transfer and voting scheme
A number-theoretic based algorithm provides for secure anonymous message transfer and electronic voting. A voter or sender may cast an encrypted vote or message that is processed through n centers...
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5680455 |
Digital signature generator /verifier/ recorder (DS-GVR) for analog transmissions
A method and apparatus authenticates and provides non-reputability for analog messages which renders it impossible for a person, including the recipient, who is not in possession of a...
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5680460 |
Biometric controlled key generation
A key generation system is implemented as follows. In an enrolment apparatus, a unique number for use with PIN operated machines or public key cryptography systems is generated by manipulation of...
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5680458 |
Root key compromise recovery
A method of recovering from a compromise of a root key which is the private key of a first public key-private key pair, the method including the steps of electronically sending out an emergency...
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5677955 |
Electronic funds transfer instruments
An electronic instrument is created in a computer-based method for effecting a transfer of funds from an account of a payer in a funds-holding institution to a payee. The electronic instrument...
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5675650 |
Controlled acceptance mail payment and evidencing system
A method for controlled acceptance mail payment and evidencing in accordance with the present invention includes creating a mail batch with a plurality of mailpieces each having encrypted indicia...
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5675649 |
Process for cryptographic key generation and safekeeping
A process for cryptographic key generation and safekeeping is provided. A plurality of key agents are selected, each having a copy of the source code. One copy of the source code is loaded onto a...
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5675652 |
Computer readable device implementing a software-efficient pseudorandom function encryption
A software-efficient pseudorandom function maps an index and an encryption key to a pseudorandom bit string useful for constructing a stream cipher. The method begins by preprocessing the...
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5673320 |
Method and apparatus for image-based validations of printed documents
Multiple validations of printed documents incorporating image information and authorizing data on a printed document assist in the printed document validation process. This technique requires the...
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5671279 |
Electronic commerce using a secure courier system
A courier electronic payment system provides customers, merchants, and banks with a secure mechanism for using a public network as a platform for credit card payment services. The system governs...
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5671285 |
Secure communication system
Encryption/decryption capable terminal units, such as FAX point-of-sale units, on non-secure telecommunications, use public keys for accessing selected target terminals, but make their messages...
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5668877 |
Method and apparatus for stepping pair keys in a key-management scheme
A method and apparatus for generating additional implicit keys from a key [K ij ] N without the necessity of generating a new Diffie-Helman (DH) certificate or requiring communication between...
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5666415 |
Method and apparatus for cryptographic authentication
Method for providing user authentication and a memory for storing a computer program for providing user authentication are described. The method includes the steps of providing a first argument...
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5666414 |
Guaranteed partial key-escrow
A given decryption key is decomposed into at least two parts, for example, a first subkey and a second subkey. The first subkey may be verifiably secret-shared among a set of one or more trustees,...
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5659616 |
Method for securely using digital signatures in a commercial cryptographic system
A system for securely using digital signatures in a commercial cryptographic system that allows industry-wide security policy and authorization information to be encoded into the signatures and...
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5657388 |
Method and apparatus for utilizing a token for resource access
A method and apparatus for utilizing a token which is preferably a "dumb token" to provide secure access by authorized users to a selected resource. The token stores a secret user code in machine...
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5652794 |
Device and process for securizing a document and graphic authentification code
The invention relates to a device for securizing a document incorporating a processing module, which calculates and associates with each document page (10), comprising a zone (11) containing the...
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5647000 |
Failsafe key escrow system
A method of generating cryptographic keys to implement a Failsafe Key Escrow system. A prime modulus Q and a generator G for Z Q are publicly known. The public key P X that is escrowed for user X...
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5646994 |
Method and apparatus for recording sensor data
A method and apparatus for recording sensor data. The analog and digital signals containing the sensor data are accompanied by a concurrent analog video signal. The analog signals are converted to...
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5644639 |
Device for carrying out a division
This device is designed for carrying out a division of a dividend A formed by "m" words with a base "b" by a divisor D. It comprises an active memory (2), a multiplication member which forms part...
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5642420 |
Cryptoinformation repeater, subscriber terminal connected thereto, and cryptocommunication method
A cryptographic information repeater installed in a system for transmitting information among a plurality of subscribers interconnected by a communication line. The repeater acts as a managing...
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5642419 |
Method for acquiring and revalidating an electronic credential
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...
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5638447 |
Compact digital signatures
Digitally signing data includes collecting a group of signers, each having a public key and a corresponding secret key, a subgroup of signers each producing a partial digital signature of the data,...
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