Matches 251 - 300 out of 415 < 1 2 3 4 5 6 7 8 9 >
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6370247 Hash value generating method and device, data encryption method and device, data decryption method and device  
Hash values, keys and cipher text which have a high degree of data scrambling are generated rapidly. When a message is sent, divisional data of the message are input, and injection extension...
6363479 System and method for signing markup language data  
A system and apparatus facilitates digital signing of data communicated between a first unit and a second unit through an interface independent proxy, or multiple independent proxies, interposed...
6347143 Cryptographic device with encryption blocks connected parallel  
A cryptographic device includes a de-multiplexer, a plurality of encryption blocks, a plurality of permutation blocks, and a multiplexer. The encryption blocks encrypt data to produce encrypted...
6345100 Robust watermark method and apparatus for digital signals  
Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum...
6324288 Cipher core in a content protection system  
A cipher system having a cipher core to encrypt plaintext data into ciphertext data, and a bus interface coupled to the cipher core to transfer the ciphertext data to a bus. In one embodiment, the...
6324286 DES cipher processor for full duplex interleaving encryption/decryption service  
A full duplex DES cipher processor (DCP) supports to execute sixteen rounds of data encryption standard (DES) operation in four encryption modes and four decryption modes, namely: Electronic Code...
6320965 Secure watermark method and apparatus for digital signals  
Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum...
6311271 How to sign digital streams  
A method of signing digital streams so that a receiver of the stream can authenticate and consume the stream at the same rate which the stream is being sent to the receiver. More specifically, this...
6301362 Method and apparatus for cryptographically transforming an input block into an output block  
A method and apparatus for cryptographically transforming an input block into an output block. The input block has a first block size and is partitionable into a plurality of input subblocks having...
6269164 Method of and system for encrypting messages  
A technique for encrypting and decrypting a data message is described herein and includes a stream cipher, a block cipher and a key generation embodiment which use a process of Summary Reduction....
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...
6266411 Method and apparatus for multiple-iteration CMEA encryption and decryption for improved security for wireless telephone messages  
An enhanced CMEA encryption system suitable for use in wireless telephony. A plaintext message is introduced into the system and subjected to a first iteration of a CMEA process, using a first CMEA...
6266412 Encrypting speech coder  
Disclosed is an encrypting speech processor architecture that provides enhanced security without the use of external cryptosync and with minimal speech degradation. This is accomplished by...
6252961 Method and apparatus for performing data encryption and error code correction  
A drive such as a DVD-ROM drive encrypts an error code correction (ECC) block in a manner that still retains the error correction capabilities of the ECC block. Encryption is performed by...
6249582 Apparatus for and method of overhead reduction in a block cipher  
An apparatus and method for reducing the overhead of a block cipher includes shortening the length of the initialization vector so that its length is less than the length of each block of...
6249583 On-line signal processing method  
A method for encryption and decryption of analog signal, wherein encryption and decryption are performed in analog domain. The transmitter creating digital representations with unique behavior;...
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...
6243469 Information transmission method and apparatus  
The present invention provides an information transmission apparatus and method for an information transmission system where encrypted information comprised of a plurality of information units each...
6226742 Cryptographic technique that provides fast encryption and decryption and assures integrity of a ciphertext message through use of a message authentication code formed through cipher block chaining of the plaintext message  
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...
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...
6195752 Electronic data processing circuit  
An electronic data processing circuit includes an operating module such as a microprocessor, at least one data memory and a data bus extending between the data memory and the operating module. In...
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...
6189095 Symmetric block cipher using multiple stages with modified type-1 and type-3 feistel networks  
The present invention provides a technique, system, and computer program for a symmetric key block cipher. This cipher uses multiple stages with a modified Type-3 Feistel network, and a modified...
6185679 Method and apparatus for a symmetric block cipher using multiple stages with type-1 and type-3 feistel networks  
The present invention provides a technique, system, and computer program for a symmetric key block cipher. Variable block sizes and key sizes are supported, as well as a variable number of rounds....
6185680 Packet authentication and packet encryption/decryption scheme for security gateway  
A packet authentication and packet encryption/decryption scheme for a security gateway suitable for a hierarchically organized network system and a mobile computing environment. For the packet...
6161181 Secure electronic transactions using a trusted intermediary  
Secure electronic transactions using a Trusted Intermediary. A system for, and method of, securely transmitting a package from a sender to a recipient, via an intermediary, are described, along...
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...
6125182 Cryptographic engine using logic and base conversions  
Apparatus and method for encrypting and decrypting using permutation, concatenation and decatenation together with rotation and arithmetic and logic combining with elements or digits or characters...
6125183 Cryptosystem for optical storage  
6122378 Data compression/encryption method and system  
An information processing system including a data input means (203, 208, 217, 219) for inputting or receiving data, a data compressing means (206) for compressing the data, a decompressing means...
6081895 Method and system for managing data unit processing  
A cryptographic controller (100) installs and manages a channel for processing data units. The cryptographic controller (100) performs background staging of programs, context, and data units for...
6078666 Audio signal processing method and related device with block order switching  
An audio signal processing method and unit for scrambling and descrambling audio signals accompanying video signals. The audio signal processing method comprises steps of dividing digital audio...
6069956 Method and apparatus for encrypting multiplexed data streams using key information continued in streams  
In a communication network in which data for transmission to a receiver terminal is multiplexed on a time-division basis and scrambled, a communication control apparatus and method for allowing the...
6064738 Method for encrypting and decrypting data using chaotic maps  
The present invention features a method for encrypting and decrypting large amounts of data such as images. A simple two-dimensional map is first generalized by the introduction of parameters. 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...
6052786 Secrecy communication system  
An encryption unit uses part of a pseudo random number generated by a random number generator to encrypt data to be transferred which are stored in the payload of a cell. A counter information...
6038317 Secret key cryptosystem and method utilizing factorizations of permutation groups of arbitrary order 2.sup.l  
A secret-key block-cipher utilizing the principles of factorization and composition with respect to general logarithmic signatures in permutation groups of arbitrary size 2 l , and methods of use...
6035042 High speed and method of providing high speed table generation for block encryption  
The present invention is an apparatus and method of encryption. A first table comprising a set of 2 n distinct n-bit input numbers and a first set of 2 n distinct n-bit output numbers is...
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...
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...
6011849 Encryption-based selection system for steganography  
A data security system which produces a steganographic selection key by using an encryption key as both the key and as the data to be encrypted. First an encryption key is copied multiple times to...
5991403 Recoverable cryptographic transformation on YUV data suitable for compressions  
A method for encoding MPEG compatible video data for subsequent compression comprises detecting a plurality of frames of video data organized as a GOP, generating an encryption key for the GOP, and...
5987124 Method and apparatus for encrypting long blocks using a short-block encryption procedure  
A system for encrypting a plaintext block using a block encryption algorithm having a block size smaller than that of the plaintext block. The plaintext block is transformed into a masked plaintext...
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...
5974144 System for encryption of partitioned data blocks utilizing public key methods and random numbers  
A method for encryption wide-bandwidth video, using a first processor for encrypting the video and a second processor for decrypting the video. Data is taken in blocks. A block of data is scrambled...
5970095 Secure data transmission on a TDM isochronous network  
A secure method for transmitting data on an isochronous network in which data is spread in successive frames in a manner known to the sender and receiver but unknown to other nodes on the network....
5966448 Cryptographic communication system  
According to a cryptographic communication system which can safely perform cipher conversion processing when cryptographic communication is performed between terminals using different cipher types,...
5952933 System having advanced embedded code hopping encryption and learn mode therefor  
A system for monitoring and controlling an area comprising a controller for controlling system operational functions and responsive to at least one remote-control transmitter. The transmitter...
Matches 251 - 300 out of 415 < 1 2 3 4 5 6 7 8 9 >