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5953424 |
Cryptographic system and protocol for establishing secure authenticated remote access
A cryptographic protocol establishes shared secrets such as encryption/decryption keys by exchanging public signals generated from transformations of private signals and one or more authentication...
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5948064 |
Discovery of authentication server domains in a computer network
A method of discovering native or non-native authentication server domains in a computer network. The various domains are "discovered" by issuing requests from the client to one or more of the...
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5949877 |
Content protection for transmission systems
A method for protecting digital content from copying and/or other misuse as it is transferred between devices over insecure links, includes authenticating that both a content source and a content...
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5949879 |
Auditable security system for the generation of cryptographically protected digital data
A secure system for Authentication information. The system includes a scanner for reading the information contained in a document, a timing mechanism for entering the time the document was read, an...
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5944794 |
User identification data management scheme for networking computer systems using wide area network
A user identification data management scheme for a networking computer systems formed by a plurality of computers which are mutually connected through a network. In this scheme, at each computer,...
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5946396 |
System and method for ensuring integrity of audio
Implemented preferably within a video camera, a cryptographic device is used to prevent audio from being fraudulently altered without detection. The cryptographic device performs a...
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5946397 |
Method of cryptography with public key based on the discrete logarithm
Method of public key cryptography based on the discrete logarithm that makes use of the computation of the variable r=g k modp where p is a prime number called a modulus, the exponent k is a...
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5943424 |
System, method and article of manufacture for processing a plurality of transactions from a single initiation point on a multichannel, extensible, flexible architecture
An architecture for processing a plurality of transactions from a single point of initiation is disclosed. The initiating computer selects a terminal identification token, and associates the token...
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5940512 |
Roaming method capable of improving roaming registration procedure
A roaming terminal enciphers a subscriber's number thereof using a public key of a home network and sends the enciphered subscriber's number to the home network via a roamed network. The home...
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5937066 |
Two-phase cryptographic key recovery system
A cryptographic key recovery system that operates in two phases. In the first phase, the sender establishes a secret value with the receiver. For each key recovery agent, the sender generates a...
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5933854 |
Data security system for transmitting and receiving data between a memory card and a computer using a public key cryptosystem
In a system wherein a memory card is connected to a computer, data stored in a memory device in the memory card is read by a processor provided in the computer. An address signal and a data signal...
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5930362 |
Generation of encryption key
A set of Diffie-Hellman data encryption values is generated prior to receiving a request for the data encryption values. The data encryption values are then stored in a database. The generating and...
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5926550 |
Peripheral device preventing post-scan modification
A scanner constructed to prevent illicit post-scan modification of a data set. The data set is a representation of visual images printed on a document scanned by the scanner. To prevent illicit...
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5926548 |
Method and apparatus for implementing hierarchical electronic cash
A user U generates a signature verification key N U , a signature key SS U and a cipher key K, enciphers (X,N U ) by a public key into E I (X,K,N U ) and sends the enciphered information to a...
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5920630 |
Method of public key cryptography that includes key escrow
A key escrow encryption method, where two users each have secret encryption keys and corresponding public encryption keys. One user receives the public encryption keys of the other user and...
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5917911 |
Method and system for hierarchical key access and recovery
A key management system includes a hierarchy (10) of independent key arbitration centers (KAC) for providing access to a user's session keys through key management centers (KMC). When a court order...
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5917913 |
Portable electronic authorization devices and methods therefor
A portable electronic authorization device for approving a transaction request originated from an electronic transaction system. The portable electronic authorization device includes first logic...
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5915018 |
Key management system for DVD copyright management
A cryptographic system and method for secure distribution and management of cryptographic keys for use in a DVD copy protection scheme is disclosed. A DVD disc having compressed, encrypted content...
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5915024 |
Electronic signature addition method, electronic signature verification method, and system and computer program product using these methods
An apparatus for adding an electronic signature to document data includes a delimiter character detector for dividing the input document data into a plurality of divided document data by using as a...
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5915021 |
Method for secure communications in a telecommunications system
A method for sending a secure message in a telecommunications system utilizing public encryption keys. All authentication parameters of each of the users, including each user's decryption key that...
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5915022 |
Method and apparatus for creating and using an encrypted digital receipt for electronic transactions
A method and apparatus for authenticating electronic transactions carried out over public networks such as the Internet is disclosed. A transaction record which identifies the electronic...
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5910989 |
Method for the generation of electronic signatures, in particular for smart cards
Processes for generating digital signatures for electronic messages. Modifying signature-generating algorithms, such as DSAs (Digital Signature Algorithms), in order to enable smart cards with...
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5909491 |
Method for sending a secure message in a telecommunications system
A method for sending a secure message in a telecommunications system using public encryption keys. A sending transceiver encrypts the message c using the sender's own public encryption key Ex to...
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5907619 |
Secure compressed imaging
A secure method and apparatus for compressing and digitally signing compressed video data. The apparatus compresses video data and permits signing of the compressed video image in such a way that...
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5907618 |
Method and apparatus for verifiably providing key recovery information in a cryptographic system
A method and apparatus for verifiably providing key recovery information to one or more trustees in a cryptographic communication system having a sender and a receiver Each communicating party has...
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5905801 |
File transfer using facsimile modem
A method is provided for transmitting and/or receiving files via a facsimile machine or computer fax modem. Electronic binary files residing on a computer, for example executable files, word...
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5905799 |
Programmed computer for identity verification, forming joint signatures and session key agreement in an RSA public cryptosystem
An article of manufacture for improving an RSA cryptosystem, includes computer readable storage medium with computer programming stored thereon. The stored computer programming is configured to be...
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5903882 |
Reliance server for electronic transaction system
A method of managing reliance in an electronic transaction system includes a certification authority issuing a primary certificate to a subscriber and forwarding to a reliance server, information...
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5901227 |
Method and apparatus for implementing partial and complete optional key escrow
A key escrow technique reliably notifies an encrypting principal about escrow authorities requiring access to a secret key used to encrypt information and, further, about how much of that key is...
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5901229 |
Electronic cash implementing method using a trustee
In an electronic cash implementing method using a trustee, a user registers his identification information ID U and anonymous public key N with the trustee and receives a license (B,I). The user...
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5894520 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Method and system for regulating discounts on merchandise distributed through networked computer systems
The present invention provides a method and system for regulating discounts on merchandise distributed through networked computer systems. The method and system involve the use of discount coupons...
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5892899 |
Tamper resistant methods and apparatus
In accordance with a first aspect of the present invention, a security sensitive program that operates with a secret is made tamper resistant by distributing the secret in space as well as in time....
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5892829 |
Method and apparatus for generating secure hash functions
A secure hash function according to the present invention uses a stretch function 202 and a compression function 202 to provide a secure hash value. A stretch function is a function which increases...
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5889862 |
Method and apparatus for implementing traceable electronic cash
In a method for implementing traceable electronic cash, a user US sends a bank BK a product N of prime numbers P and Q, a prime number L and his real name ID U , and the bank BK generates a...
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5889861 |
Identity confidentiality method in radio communication system
The radio communication system has at least one first radio station such as a base station and a plurality of second radio stations such as mobile stations. The base station at least possesses a...
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5883958 |
Method and device for data decryption, a method and device for device identification, a recording medium, a method of disk production, and a method and apparatus for disk recording
A video disk playback apparatus includes a disk driver which retrieves video data and a key data table from a digital video disk, and a decoder board which has its own ID. The disk driver receives...
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5878142 |
Pocket encrypting and authenticating communications device
A portable security device is disclosed which can be carried by an individual and connected directly to telephone circuits to both authenticate that individual and encrypt data communications. The...
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5878140 |
Limited-traceability systems
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...
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5870477 |
Enciphering/deciphering device and method, and encryption/decryption communication system
A plaintext file 41 is enciphered using a file key 44, to generate ciphertext 42. The file key 44 is enciphered using a secret key 47 and a management key 48, respectively, to form an enciphered...
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5870478 |
Modular exponentiation calculation apparatus and method
In the modular exponentiation calculation apparatus of the present invention, a computer calculates a modular exponentiation C=M E modN (M,N: integral number, E: exponent expressed in base m, C:...
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5870476 |
Process for pledging data for a secure data exchange protocol
The process comprises a "pledging" step in which a debtor party transmits to a creditor party a data item which is the image of a pledged data item, and a "commencement" step in which the debtor...
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5867577 |
Method and apparatus for authenticating a data carrier intended to enable a transaction or access to a service or a location, and corresponding carrier
A method and an apparatus for authenticating a data carrier enables a transaction or access to a service or a location, and the corresponding carrier. The carrier (1) has a specific number (Ns) and...
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5867578 |
Adaptive multi-step digital signature system and method of operation thereof
A multi-step digital signature system and method is provided having a distributed root certifying authority 20. Messages received at the root certifying authority 20 are distributed to root...
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5864667 |
Method for safe communications
Disclosed is a method for safe distribution of encryption keys including a known public and secret private keys in establishing a secure link between computer users resided at separate location...
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5862224 |
Cryptographic process for protection against fraud
A cryptographic process is for protection against fraud. An allocation of a secret key K is made to a card and to an application and an input value R is defined. The card and application calculate...
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5861662 |
Anti-tamper bond wire shield for an integrated circuit
An anti-tamper shield for an integrated circuit (IC) includes a bond wire which passes through a protective layer such as an epoxy encapsulating layer of the IC. The bond wire carries a signal,...
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5852665 |
Internationally regulated system for one to one cryptographic communications with national sovereignty without key escrow
This invention discloses an encryption method for generating an encrypted message which is controllably decryptable, the method including providing at least one agency public key to at least one...
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5850450 |
Method and apparatus for encryption key creation
A portable electronic data module for secure transactions, the electronic data module having a random number generator and an optimized co-processor for producing unbreakable key sets for a two-key...
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5850444 |
Method and apparatus for encrypting radio traffic in a telecommunications network
A generic communications network provides an encrypted communications interface between service networks and their subscribers. When communications are initiated between a subscribing...
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5850443 |
Key management system for mixed-trust environments
The invention allows for transporting, in different degrees of security strength, a symmetric key encrypted using an asymmetric encryption technique, and along with this transporting ciphertext...
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