Matches 151 - 200 out of 344 < 1 2 3 4 5 6 7 >
Match Document Document Title
6269163 Enhanced block ciphers with data-dependent rotations  
A plaintext message to be encrypted is segmented into a number of words, e.g., four words stored in registers A, B, C and D, and an integer multiplication function is applied to a subset of the...
6246768 Data encryption system for encrypting plaintext data  
In order to encrypt plaintext data while maintaining high security, the plaintext data is received and divided into a plurality of plaintext data blocks, each of which has the same bit length. A...
6243470 Method and apparatus for advanced symmetric key block cipher with variable length key and block  
A method and apparatus for an advanced symmetric key cipher for encryption and decryption, using a block cipher algorithm. Different block sizes and key sizes are supported, and a different sub-key...
6240186 Simultaneous bi-directional translation and sending of EDI service order data  
A method and apparatus for performing bi-directional data transfer operations over a global computer network are provided. This is accomplished by extracting data from a database stored on a first...
6219420 High assurance encryption system and method  
A processor (22) of an encryption system (20) receives plain text (24) and operates an encryption algorithm to convert the plain text (24) to cipher text (26). A state monitor (30) confirms a...
6199053 Digital signature purpose encoding  
A method and apparatus for encoding a purpose into a digital signature, where purpose and digital signature bound into an extended digital signature. The extended digital signature capability binds...
6195677 Distributed network computing system for data exchange/conversion between terminals  
A data exchange unit is arranged in a server. Service data provided as an application service is converted into a predetermined format on the basis of the attribute data of a terminal as a...
6192129 Method and apparatus for advanced byte-oriented symmetric key block cipher with variable length key and block  
A method and apparatus for an advanced byte-oriented symmetric key cipher for encryption and decryption, using a block cipher algorithm. Different block sizes and key sizes are supported, and a...
6128737 Method and apparatus for producing a message authentication code in a cipher block chaining operation by using linear combinations of an encryption key  
A cryptographic technique that not only provides fast and extremely secure encryption and decryption but also assures integrity of a ciphertext message. This technique involves, during message...
6128386 Multiple number base encoder/decoder using a corresponding exclusive or function  
Plaintext elements and masking array elements are converted into digits in another number base. The resulting digits are combined modulo the new number base and the result is converted back into...
6079021 Method and apparatus for strengthening passwords for protection of computer systems  
A computer implemented method provides access to processes and data using strengthened password. During an initialization phase, an access code is stored in a memory of a computer system. The...
6061734 System and method for determining if a message identifier could be equivalent to one of a set of predetermined indentifiers  
A system and method for determining if a received identifier could be equivalent to one of a set of predetermined identifiers. Predetermined identifiers are encoded into an output. The coded output...
6061454 System, method, and computer program for communicating a key recovery block to enable third party monitoring without modification to the intended receiver  
A method is disclosed for communicating a key recovery block from a sender to a non-enabled receiver, without the danger of throwing the receiver into an indeterminant state, and without modifying...
6058186 Information signal transmission system  
The information signal transmission system of the present invention is so designed as to convert the analog information signal into digital information data and to transmit these digital data after...
6049608 Variable length nonlinear feedback shift registers with dynamically allocated taps  
A new class of variable length, nonlinear feedback shift registers (NLFSR's) is disclosed that uses data-dependent dynamically allocated taps to filter digital information reversibly, flexibly, and...
6047258 Renting/leasing instrument options using satellite positioning system  
An apparatus and a method of purchasing or leasing the time dependent option of operation of an instrument are disclosed. An apparatus generates and uses a time dependent password configured to be...
6038552 Method and apparatus to process combined credit and debit card transactions  
A method and apparatus for executing a transaction using a credit card includes the steps of: maintaining a credit card account associated with the credit card, the credit card account having a...
6031911 Practical S box design  
A method of generating a substitution box (S-box) involves generating an S-box with desired characteristics, forming a new S-box with another column such that the new S-box has the desired...
6028933 Encrypting method and apparatus enabling multiple access for multiple services and multiple transmission modes over a broadband communication network  
The specification relates to the encryption of data transmitted over a broadband multiple access bi-directional hybrid fiber/coax (HFC) network. The method supports downstream broadcast encryption...
6028939 Data security system and method  
A data security system and method for providing a cryptographic process such as the Data Encryption Standard comprises a microprocessor having a programmable hardware element such as a field...
5995624 Bilateral authentication and information encryption token system and method  
An authentication and information encryption system and method which uses a token system for increased security in accommodating bilateral encrypted communications between an originating system and...
5987139 Method for encryption of information  
The method involves modifying an encryption key (Kc) in accordance with a given algorithm and in dependence on the ordinal number of a time slot to obtain a modified encryption key. A modified...
5987137 Method for the encryption of data transfer  
The object of the invention is a method for the encryption of information transferred between data transfer devices (MS, SGSN) in a data communication system wherein one or more data frames are...
5963644 Process and device for making secure a telephone link connecting two subscriber sets  
A telephone link comprises two network terminals to which two subscriber sets are respectively connected, two subscriber lines respectively linking the two network terminals to two line terminals...
5956405 Implementation efficient encryption and message authentication  
Encryption and authentication techniques which can be implemented on inexpensive, e.g., 8-bit, microprocessors and micro-controllers, using very little of the microprocessor's memory, are...
5953418 Providing selective data broadcast receiver addressability  
A method of transmitting data to a plurality of receivers is provided wherein an identifier is assigned to each of the receivers that cannot be ascertained once assigned, a subset of receivers is...
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...
5949883 Encryption system for mixed-trust environments  
Encryption frequently needs to be used in communication networks which span different geographical regions which can be considered to be trusted to different extents. According to one embodiment,...
5949884 Design principles of the shade cipher  
A method of encrypting or decrypting an input message block of binary data of predetermined length 2n into an output message block by dividing the message block into two equal size halves,...
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...
5933499 Image processing apparatus  
An image processing apparatus separates input image data into low resolution image data and one or more auxiliary image data for interpolating the low resolution image data, and decrypts at least...
5930365 Digital data shuffling/de-shuffling system  
The invention provides a digital data shuffling/de-shuffling system so that information data is not understood or deciphered by unauthorized third party. Included are a system for generating plural...
5924084 Method for tracing payment data in an anonymous payment system  
The invention relates to a method for tracing payment data in an anonymous payment system having electronic payment means, such as so-called "smart cards". According to the invention, the user...
5914667 Advanced embedded code hopping system having master fixed code encryption  
A system for monitoring and controlling an area comprising a controller for controlling system operational functions; at least one remote-control transmitter for transmitting system commands to the...
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...
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...
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...
5878135 Decoding system for processing encrypted broadcast, cable or satellite video data  
A decoder excludes an encryption code or key from decrypted or non-decrypted program output data. Decrypted program representative data is generated from an input datastream containing encrypted...
5870473 Electronic transfer system and method  
A system and method relating to secure communications in a communication network is disclosed. The invention uses sessions having limited duration to enable parties to communicate securely in the...
5848154 Apparatus for managing software using quantity  
A DES decrypting unit decrypts video data frames encrypted and compressed based on MPEG standards, when receiving them. The decrypted video data frames are expanded one by one in a MPEG expansion...
5841872 Encryption enhancement system  
A system for enhancing an existing data encryption system by preprocessing or postprocessing the data stream as it enters or leaves the encryption system. This external processing makes the...
5838794 Method and apparatus for inter-round mixing in iterated block substitution systems  
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each sub-block of data affects each...
5835599 Muti-cycle non-parallel data encryption engine  
A multi-cycle, non-parallel DES encryption scheme that supports CBC, OFB, CFB, and ECB modes of operation. Three independent cipher stages are coupled together in series in order to implement a...
5835597 Software-efficient pseudorandom function and the use thereof for decryption  
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...
5825886 Construction symmetric ciphers using the cast design procedure  
A new design procedure for constructing a family of DES-like Substitution-Permutation Network (SPN) cryptosystems with desirable cryptographic properties including provable resistance to...
5812666 Cryptographic key management and validation system  
A Key Management System for generating, distributing and managing cryptographic keys used by an information transaction system that employs cryptographic means to produce evidence of information...
5809144 Method and apparatus for purchasing and delivering digital goods over a network  
A method for purchasing and delivering goods over a network is comprised of the steps of identifying a digital good to be purchased. A purchase price for the digital good is negotiated. After the...
5809147 Device for cryptographically processing data packets and method of generating cryptographic processing data  
A device for encrypting or decrypting data packets. The device includes two cryptographic elements. The first cryptographic element generates processing data, based on a first starting value, for...
5799089 System and apparatus for blockwise encryption/decryption of data  
A system for encrypting and decrypting digital data wherein the data is divided in packets of N blocks X(1) . . . X(N) of 2 m bits, comprises an encryption device and a decryption device. The...
5796837 Apparatus and method for generating a secure substitution-box immune to cryptanalyses  
The apparatus for generating a secure substitution-box immune to differential and linear cryptanalysises comprises a preprocessor for exchanging a location by the unit of bit while passing the...
Matches 151 - 200 out of 344 < 1 2 3 4 5 6 7 >