| 6731755 |
Split-key cryptographic system and method |
| May-4-2004 |
A method of operating a split-key cryptographic system having two or more co-operating microprocessors, i, linked via a communications channel, involving the generation of a public modulus, N, being the... |
| 6728379 |
Information processor and information processing method |
| Apr-27-2004 |
An information processor receives at a communication section thereof an encrypted content decryption key generated by encrypting, by a distribution encryption key, a content decryption key for decryption... |
| 6711263 |
Secure distribution and protection of encryption key information |
| Mar-23-2004 |
The invention relates to secure distribution of a private key from a distributing unit to a receiving unit, and is based on providing each of the distributing unit and the receiving unit with a protecting... |
| 6708272 |
Information encryption system and method |
| Mar-16-2004 |
An encryption system permits end-to-end encryption of information over an untrusted interconnection network. The information encryption system includes at least one client for processing information. The... |
| 6704867 |
Method for publishing certification information representative of selectable subsets of rights and apparatus and portable data storage media used to practice said method |
| Mar-9-2004 |
A method for certification by a plurality of certifying authorities of the public key of a user wishing to communicate using a public key encryption system while asserting only a subset of rights. A plurality... |
| 6697947 |
Biometric based multi-party authentication |
| Feb-24-2004 |
Methods, systems and computer program products are provided which allow for multi-party authentication by receiving a plurality of biometric authentication messages from a corresponding plurality of users.... |
| 6694025 |
Method and apparatus for secure distribution of public/private key pairs |
| Feb-17-2004 |
A list of public/private key pairs are stored at a server, wherein the private key is stored in an encrypted form, the encryption being based on a master key. To distribute a public/private key pair to... |
| 6678821 |
Method and system for restricting access to the private key of a user in a public key infrastructure |
| Jan-13-2004 |
An encryption/decryption system for providing restricted use of each key in a plurality of keys to preserve confidentiality of the plurality of keys. Each key is usable by an associated user in a public... |
| 6658566 |
Process for storage and use of sensitive information in a security module and the associated security module |
| Dec-2-2003 |
The invention relates to a process for storing and using sensitive information in a security module and to a security module arranged to implement the process, and protect the sensitive information against... |
| 6654883 |
Device authentication and encrypted communication system offering increased security |
| Nov-25-2003 |
A system composed of a plurality of user devices, each storing unique secret information, a system device and a control unit. The control unit produces key capsule data by performing a digital signature... |
| 6643774 |
Authentication method to enable servers using public key authentication to obtain user-delegated tickets |
| Nov-4-2003 |
A method, system, and computer-readable code for delegating authority in a public key authentication environment from a client to a server machine or process, in order that the server machine or process... |
| 6615351 |
Method for checking the authenticity of a data medium |
| Sep-2-2003 |
In a method for checking the authenticity of a data medium, in particular a smart card, the encrypted form of a physical feature of the data medium is stored in the data medium. The encrypted form of the... |
| 6614909 |
Methods, systems, and circuits for generating keys for public key cryptosystems using parallel processing for modular operations of IC cards |
| Sep-2-2003 |
Modular operations are used to perform encryption/decryption of keys in a public cryptosystem. The modular operations process a first data in parallel with a second data to provide for the processing of... |
| 6584566 |
Distributed group key management for multicast security |
| Jun-24-2003 |
A method and apparatus for distributed group key management for multicast security. According to one aspect of the invention, an initiator key server distributes to a plurality of key servers a first key... |
| 6571334 |
Apparatus and method for authenticating the dispatch and contents of documents |
| May-27-2003 |
Apparatus and method for authenticating that a sender has sent certain information via a dispatcher to a recipient is disclosed. The method includes the steps of: (a) providing a set A comprising a plurality... |
| 6560339 |
Electronic watermarking method, digital information distribution system using such method, and storage medium storing program of such method |
| May-6-2003 |
An electronic watermarking method includes the steps of generating a plurality piece of information with different electronic watermark information, generating a plurality piece of encrypted information... |
| 6549624 |
Apparatus and method for enhancing the security of negotiable documents |
| Apr-15-2003 |
The invention relates to an apparatus and method for enhancing the security of selected information associated with a negotiable document, such as the monetary value of a cheque. In the invention, one... |
| 6530020 |
Group oriented public key encryption and key management system |
| Mar-4-2003 |
In a public key encryption system where an individual is used as a unit, an idea of "group" is newly introduced. Then, both an encryption process operation of a plain text by an arbitrary member belonging... |
| 6473743 |
Postage meter having delayed generation of cryptographic security parameters |
| Oct-29-2002 |
A method for using cryptographic parameters in a postage meter for securing postage indicium data includes the steps of generating in the postage meter 1) first cryptographic parameters which are useable... |
| 6463534 |
Secure wireless electronic-commerce system with wireless network domain |
| Oct-8-2002 |
A method of conducting transactions in a wireless electronic commerce system, where the system comprises a wireless network operator certification authority (400) having a root public key certificate and... |
| 6449717 |
Data copyright management system |
| Sep-10-2002 |
A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication... |
| 6446205 |
Cryptosystems with elliptic curves chosen by users |
| Sep-3-2002 |
Participants in a cryptosystem select their own elliptic curve and finite field, rather than using a centrally chosen elliptic curve. The curve is chosen from a predetermined set of elliptic curves expressed... |
| 6438235 |
Media content protection utilizing public key cryptography |
| Aug-20-2002 |
A system and method for providing protection of content stored on a bulk storage media is disclosed. The technique for providing protection from unauthorized utilization of the content so stored is provided... |
| 6424714 |
Method and apparatus for providing conditional access in connection-oriented interactive networks with a multiplicity of service providers |
| Jul-23-2002 |
A control system provides secure transmission of programs, including at least one of video, audio, and data, between a service provider and a customer's set top unit over a digital network. Program bearing... |
| 6411772 |
Data structure for distinguishing data of authorized and unauthorized publishers |
| Jun-25-2002 |
A system for playing a selected one of multiple audio tracks recorded in synchronized fashion with a motion picture on an optical disk. The optical disk has encoded on it a mixing master music and effects... |
| 6408390 |
Apparatus for data copyright management system |
| Jun-18-2002 |
A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM,... |
| 6385723 |
Key transformation unit for an IC card |
| May-7-2002 |
A multi-application IC card system and method is disclosed providing a secure data transmission technique. The method is used, for example, to load an application from an application provider, which could... |
| 6370249 |
Method and apparatus for public key management |
| Apr-9-2002 |
A method and apparatus for public key management is accomplished when an associated authority provides, from time to time, a public key of at least one of a plurality of certificate authorities to a client.... |
| 6357006 |
Digital signaturing method and system for re-creating specialized native files from single wrapped files imported from an open network or residing on a CD-ROM |
| Mar-12-2002 |
A method and system is provided whereby after specialized original native format files have been signatured and "wrapped" into industry standard byte stream text files for transmission over the Internet... |
| 6347373 |
Method and device for the protected storage of data from message traffic |
| Feb-12-2002 |
Method and processor (12) for: a. setting up a telecommunication link between various communication appliances (1, 2, 3, 7, 8, 9); b. setting up a monitoring link (13) between the telecommunication link... |
| 6336186 |
Cryptographic system and methodology for creating and managing crypto policy on certificate servers |
| Jan-1-2002 |
A cryptosystem having a Certificate (Key) Server for storing and maintaining certificate or key information in a certificate database is described. The Certificate Server allows clients to submit and retrieve... |
| 6324645 |
Risk management for public key management infrastructure using digital certificates |
| Nov-27-2001 |
A public key management infrastructure (104) is shared by at least two users (102). A method (300) for managing risk arising from a user's use of the shared public key management infrastructure (104) includes... |
| 6314190 |
Cryptographic system with methods for user-controlled message recovery |
| Nov-6-2001 |
A cryptosystem is described which automatically provides an extra "message recovery" recipient(s) when an encrypted message is generated in the system. The system is typically configured such that the... |
| 6304974 |
Method and apparatus for managing trusted certificates |
| Oct-16-2001 |
The present invention provides a system for managing trusted certificates for authenticating communications for clients belonging to an enterprise. The system assembles a list of trusted certificates containing... |
| 6289105 |
Method and apparatus for encrypting and transferring electronic mails |
| Sep-11-2001 |
A scheme for encrypting and transferring electronic mails which enables the realization of the information management regarding encrypted electronic mails by an electronic mail manager, and the transfer... |
| 6282650 |
Secure public digital watermark |
| Aug-28-2001 |
A cryptographic device and corresponding method for producing a cloaked watermark which is a private watermark having the functionality of a public watermark. In one embodiment, the cryptographic device... |
| 6266421 |
Key recovery system and key recovery method |
| Jul-24-2001 |
The present invention has an object to overcome problems of a key recovery system using a conventional KRF system and to achieve efficient operation of the overall key recovery system. A key recovery system... |
| 6266420 |
Method and apparatus for secure group communications |
| Jul-24-2001 |
A method for securing group communications with reduced message overhead begins by initiating a secure group communication, where a group communication is secured based on security credentials of the group.... |
| 6263446 |
Method and apparatus for secure distribution of authentication credentials to roaming users |
| Jul-17-2001 |
A roaming user needing an his authentication credential (e.g., private key) to access a computer server to perform an electronic transaction may obtain the authentication credential in an on-demand fashion... |
| 6263445 |
Method and apparatus for authenticating connections to a storage system coupled to a network |
| Jul-17-2001 |
A data management technique for managing accesses to data at a shared storage system includes a filter at the storage system. The filter is coupled to a configuration table, which identifies which of a... |
| 6263435 |
Dual encryption protocol for scalable secure group communication |
| Jul-17-2001 |
A logical tree structure and method for managing membership in a multicast group provides scalability and security from internal attacks. The structure defines key groups and subgroups, with each subgroup... |
| 6260142 |
Access and storage of secure group communication cryptographic keys |
| Jul-10-2001 |
A method and apparatus for secure group communication detects the deletion of a member of the group and uses the detected deletion to update the security credentials of a group by updating a repository... |
| 6252964 |
Authorization of services in a conditional access system |
| Jun-26-2001 |
A cable television system provides conditional access to services. The cable television system includes a headend from which service "instances", or programs, are broadcast and a plurality of set top units... |
| 6252959 |
Method and system for point multiplication in elliptic curve cryptosystem |
| Jun-26-2001 |
A point doubling method for elliptic curve cryptosystems is disclosed in which 2.sup.k P=(X.sub.k, y.sub.k) is directly calculated from P=(x,y) without computing intermediate points such as 2P, 4P, etc.... |
| 6246767 |
Source authentication of download information in a conditional access system |
| Jun-12-2001 |
A cable television system provides conditional access to services. The cable television system includes a headend from which service "instances", or programs, are broadcast and a plurality of set top units... |
| 6240187 |
Key replacement in a public key cryptosystem |
| May-29-2001 |
Improved key management is provided by a public key replacement apparatus and method for operating over insecure networks. An active public key and the mask of a replacement public key are provided by... |
| 6230269 |
Distributed authentication system and method |
| May-8-2001 |
An authentication system for a distributed network having multiple clients and a server enables a user to log on at any one of the clients with a password and receive his/her associated public/private... |
| 6226618 |
Electronic content delivery system |
| May-1-2001 |
Disclosed is a method and apparatus of securely providing data to a user's system. The data is encrypted so as to only be decryptable by a data decrypting key, the data decrypting key being encrypted using... |
| 6215877 |
Key management server, chat system terminal unit, chat system and recording medium |
| Apr-10-2001 |
A key management server is arranged at the same position as a terminal unit as viewed from a chat server. A channel secret key unique to each channel is generated by the key management server and distributed... |
| 6215878 |
Group key distribution |
| Apr-10-2001 |
A method for distributing a secret key from a key holder H to intended group members M. The method assumes that during the distribution process each party, a group member M and the key holder H, can decrypt... |
