| 6266411 |
Method and apparatus for multiple-iteration CMEA encryption and decryption for improved security for wireless telephone messages |
| Jul-24-2001 |
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 key... |
| 6252961 |
Method and apparatus for performing data encryption and error code correction |
| Jun-26-2001 |
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 generating an... |
| 6249582 |
Apparatus for and method of overhead reduction in a block cipher |
| Jun-19-2001 |
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 information processed... |
| 6249583 |
On-line signal processing method |
| Jun-19-2001 |
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; producing... |
| 6243469 |
Information transmission method and apparatus |
| Jun-5-2001 |
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 hierarchically... |
| 6243470 |
Method and apparatus for advanced symmetric key block cipher with variable length key and block |
| Jun-5-2001 |
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 is... |
| 6219420 |
High assurance encryption system and method |
| Apr-17-2001 |
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 conversion... |
| 6201869 |
Data transformation apparatus and data transformation method |
| Mar-13-2001 |
Data transformation apparatuses and methods for transforming two arbitrary pieces of data of A input data and B input data, wherein a first nonlinear transformation of the A input data is performed using... |
| 6195752 |
Electronic data processing circuit |
| Feb-27-2001 |
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 order... |
| 6195677 |
Distributed network computing system for data exchange/conversion between terminals |
| Feb-27-2001 |
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 communication... |
| 6192129 |
Method and apparatus for advanced byte-oriented symmetric key block cipher with variable length key and block |
| Feb-20-2001 |
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 different... |
| 6189095 |
Symmetric block cipher using multiple stages with modified type-1 and type-3 feistel networks |
| Feb-13-2001 |
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 Unbalanced... |
| 6185680 |
Packet authentication and packet encryption/decryption scheme for security gateway |
| Feb-6-2001 |
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 authentication,... |
| 6185679 |
Method and apparatus for a symmetric block cipher using multiple stages with type-1 and type-3 feistel networks |
| Feb-6-2001 |
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. The... |
| 6185304 |
Method and apparatus for a symmetric block cipher using multiple stages |
| Feb-6-2001 |
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. The... |
| 6161181 |
Secure electronic transactions using a trusted intermediary |
| Dec-12-2000 |
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 with a... |
| 6145079 |
Secure electronic transactions using a trusted intermediary to perform electronic services |
| Nov-7-2000 |
Secure electronic transactions using a trusted intermediary with non-repudiation of receipt and contents of message. A system of, and method for, securely transmitting a package from a sender to a recipient,... |
| 6128737 |
Method and apparatus for producing a message authentication code in a cipher block chaining operation by using linear combinations of an encryption key |
| Oct-3-2000 |
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 encryption:... |
| 6128386 |
Multiple number base encoder/decoder using a corresponding exclusive or function |
| Oct-3-2000 |
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 elements... |
| 6125183 |
Cryptosystem for optical storage |
| Sep-26-2000 |
A method of encrypting and decrypting digital data such as text, numeric, images, pictures, especially tailored for optical compact discs; said method comprising of ciphering/deciphering and error detection... |
| 6125182 |
Cryptographic engine using logic and base conversions |
| Sep-26-2000 |
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 from... |
| 6122378 |
Data compression/encryption method and system |
| Sep-19-2000 |
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 (221)... |
| 6122375 |
Hash value generating method and device, data encryption method and device, data decryption method and device |
| Sep-19-2000 |
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 processing... |
| 6108421 |
Method and apparatus for data encryption |
| Aug-22-2000 |
A method and apparatus for use in encrypting and decrypting digital communications converting an initial block to final block based on freely selectable control information and secret key information.... |
| 6081895 |
Method and system for managing data unit processing |
| Jun-27-2000 |
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 the programmable... |
| 6078666 |
Audio signal processing method and related device with block order switching |
| Jun-20-2000 |
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 signals... |
| 6075859 |
Method and apparatus for encrypting data in a wireless communication system |
| Jun-13-2000 |
In a communications system, a method of transforming a set of message signals representing a message comprising the steps of first encoding one of the set of message signals in accordance with a first... |
| 6072873 |
Digital video broadcasting |
| Jun-6-2000 |
In order to implement the Digital Video Broadcasting descrambling algorithm in the context of MPEG compressed data streams containing interleaved sections of scrambled and unscrambled data, at a data rate... |
| 6069956 |
Method and apparatus for encrypting multiplexed data streams using key information continued in streams |
| May-30-2000 |
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 data... |
| 6064738 |
Method for encrypting and decrypting data using chaotic maps |
| May-16-2000 |
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 generalized... |
| 6061734 |
System and method for determining if a message identifier could be equivalent to one of a set of predetermined indentifiers |
| May-9-2000 |
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 is... |
| 6052786 |
Secrecy communication system |
| Apr-18-2000 |
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 assigning... |
| 6047374 |
Method and apparatus for embedding authentication information within digital data |
| Apr-4-2000 |
Arbitrary digital information is embedded within a stream of digital data, in a way that avoids detection by a casual observer and that allows a user to determine whether the digital data have been modified... |
| 6038317 |
Secret key cryptosystem and method utilizing factorizations of permutation groups of arbitrary order 2.sup.l |
| Mar-14-2000 |
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.sup.l, and methods of use thereof... |
| 6035042 |
High speed and method of providing high speed table generation for block encryption |
| Mar-7-2000 |
The present invention is an apparatus and method of encryption. A first table comprising a set of 2.sup.n distinct n-bit input numbers and a first set of 2.sup.n distinct n-bit output numbers is received.... |
| 6031911 |
Practical S box design |
| Feb-29-2000 |
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 characteristics... |
| 6028939 |
Data security system and method |
| Feb-22-2000 |
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 programmable... |
| 6021201 |
Method and apparatus for integrated ciphering and hashing |
| Feb-1-2000 |
A cryptography unit having a cipher unit and a hash unit coupled in parallel for simultaneous ciphering and hashing. The cipher unit implements a cipher algorithm that operates on a data block having a... |
| 6011849 |
Encryption-based selection system for steganography |
| Jan-4-2000 |
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 form... |
| 6009176 |
How to sign digital streams |
| Dec-28-1999 |
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 invention... |
| 5991403 |
Recoverable cryptographic transformation on YUV data suitable for compressions |
| Nov-23-1999 |
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 encrypting... |
| 5987137 |
Method for the encryption of data transfer |
| Nov-16-1999 |
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 created... |
| 5987124 |
Method and apparatus for encrypting long blocks using a short-block encryption procedure |
| Nov-16-1999 |
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 block... |
| 5974144 |
System for encryption of partitioned data blocks utilizing public key methods and random numbers |
| Oct-26-1999 |
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 to... |
| 5970095 |
Secure data transmission on a TDM isochronous network |
| Oct-19-1999 |
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. In one... |
| 5966448 |
Cryptographic communication system |
| Oct-12-1999 |
According to a cryptographic communication system which can safely perform cipher conversion processing when cryptographic communication is performed between terminals using different cipher types, when... |
| 5952933 |
System having advanced embedded code hopping encryption and learn mode therefor |
| Sep-14-1999 |
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 transmits... |
| 5949884 |
Design principles of the shade cipher |
| Sep-7-1999 |
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, performing one... |
| 5933499 |
Image processing apparatus |
| Aug-3-1999 |
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 one of... |
| 5930365 |
Digital data shuffling/de-shuffling system |
| Jul-27-1999 |
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 bits... |
