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7418098 Data type preserving encryption  
A method and a system for encryption of a data element in a relational database, wherein each data element includes a string of at least one character. The method includes the steps of: reading the...
7412605 Method and apparatus for variable encryption of data  
A system and method for encrypting content in an adaptive manner. Portions of data to be encrypted are identified and an encryption ratio that specifies the one or more portions of data to encrypt...
7403615 Methods and apparatus for accelerating ARC4 processing  
Methods and apparatus are provided for improving ARC4 processing in a cryptography engine. A multiple ported memory can be used to allow pipelined read and write access to values in memory....
7400730 Cryptographic communication method in communication system  
An RNC server issues an encryption start instruction to a media gateway (MG) and a terminal. The MG and terminal, which have received the encryption start instruction, encrypt U-Plane information...
7386124 Block encoding method and block encoding/decoding circuit  
A block cipher method eliminates the overhead associated with key scheduling, decreases the required time for encryption or decryption, and increases the total throughput. A key scheduling circuit...
7382876 Hash function constructions from expander graphs  
Hash function constructions from expander graphs are described. In one aspect, an expander graph is walked to compute a hash function. The expander graph is walked using respective subsets of an...
7380132 Data recording method and apparatus, data record medium and data reproducing method and apparatus  
An input is ciphered in at least one of a sector forming circuit 13 , a scrambling circuit 14 , a header appendage circuit 15 , an error correction encoding circuit 16 , a modulation circuit ...
7376826 Methods and apparatus for performing encryption and authentication  
Methods and apparatus are provided for a cryptography accelerator to efficiently perform authentication and encryption operations. A data sequence is received at a cryptography accelerator. An...
7366302 Apparatus and method for an iterative cryptographic block  
A method and apparatus for an iterative cryptographic block under the control of a CPU and without a fixed number of stages. In one embodiment, a first cryptographic block descrambles received...
7366299 Method for encrypting and decrypting data using derivative equations and factors  
A data cryptographer encrypts and decrypts character data of any given length using derivative equations and factors. The use of factors and derivative equations introduces the randomness required...
7360084 System, device, and method for controlling access in a multicast communication network  
A system, device, and method for controlling access in a multicast communication network uses a centralized host authentication scheme to prevent unauthorized hosts from joining a shared multicast...
7352862 Encryption method, communication system, transmission device, and data input device  
An encryption method includes the steps of (a) generating random data including a first part and a second part, the first part specifying an operation to be performed on plain text data and the...
7346165 Apparatus and method for generating scrambling code in mobile communication system  
An apparatus generates a scrambling code in a mobile communication system by performing one or more mask operations on an input state value. The apparatus includes a register memory which receives...
7346161 Method and apparatus for designing cipher logic, and a computer product  
An optimization processing unit optimizes an input and output bit number of an S-box based on parameters inputted from an input unit. The examples of the parameters are memory capacity of a primary...
7346160 Randomization-based encryption apparatus and method  
A method for encryption data subdivided into segments of random lengths. A data source having a state corresponding to initialization parameters and the number of patterns output therefrom provides...
7340059 Programmable scrambler and De-scrambler for digital telephony equipment  
A scrambler circuit for digital telephony equipment receives a sequence of input bits, generates the sequence of output bits based on the input bits and stores the sequence of output bits. The...
7336783 Cryptographic systems and methods supporting multiple modes  
Cryptographic systems and methods that support multiple modes of operation, such as CBC, CTR and/or CCM modes. In one aspect, a method for encrypting data includes reading a plaintext data block...
7321659 Simple universal hash for plaintext aware encryption  
A simple universal hash apparatus and method include input means for inputting at least one of a plurality of Plaintext blocks into an integrity aware encryption scheme using at least one of two...
7321658 Padding application method ensuring security of cryptosystem and encryptor/decryptor  
An encryptor/decryptor capable of achieving secure cryptographic communication by applying appropriate padding to a cryptosystem such as NTRU cryptosystems. When an n-bit plaintext M is received,...
7319751 Data encryption  
A method of encrypting a data unit, the method comprising the steps of dividing the data unit into a series of data blocks, and for each data block, applying a block cipher function to a data block...
7317795 Pipelined deciphering round keys generation  
An apparatus is equipped with a deciphering round key generator to successively generate in real time at least a first and a second deciphering round key based on a deciphering key, and a...
7313236 Methods and apparatus for secure and adaptive delivery of multimedia content  
Techniques for securely and adaptively delivering multimedia content. It is assumed that a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each...
7310421 Particular plaintext detector  
An object is to enhance the difficulty in decrypting ciphertext. In order to do input into an encryption algorithm that receives plaintext to output ciphertext, a particular plaintext detector for...
7308099 Device and method for producing an encoded audio and/or video data stream  
An apparatus for generating an encrypted data stream representing an audio and/or video signal comprises an encoder for encoding an input signal to generate a data stream with a predefined data...
7305085 Encryption apparatus and method, and decryption apparatus and method based on block encryption  
In each stage, multiple parallel nonlinear transformation modules each perform local lower-level diffusion, then a diffusion module performs higher-level diffusion over the block width and multiple...
7305084 Fast encryption and authentication for data processing systems  
Methods and apparatus are presented for secure, authenticated communication and data storage. The methods can be based on other methods such as IAPM, in which the encryption and authentication keys...
7298849 Method and apparatus for simultaneous encryption and decryption of publicly distributed media  
The present invention provides secure communication from one encryption domain to another using a trusted module. In one embodiment, the invention includes generating a cipher stream based on a...
7295672 Method and apparatus for fast RC4-like encryption  
A method and apparatus for encrypting information. In one embodiment, a method for encrypting information includes obtaining a value A from an array having a plurality of values and determining a...
7289629 Primitives for fast secure hash functions and stream ciphers  
Techniques are disclosed to enable efficient implementation of secure hash functions and/or stream ciphers. More specifically, a family of graphs is described that has relatively large girth, large...
7277548 Cryptographic method and computer program product for use in wireless local area networks  
An encryption system and method that may encrypt all of the transmitted and received data packets on the data link layer without collisions on the Initialization Vector (IV). In the encryption...
7277546 Methods and apparatus for multi-level dynamic security system  
Methods and apparatus for converting original data into a plurality of sub-bands using wavelet decomposition; encrypting at least one of the sub-bands using a key to produce encrypted sub-band...
7277542 Stream cipher encryption application accelerator and methods thereof  
A system for encrypting and decrypting data formed of a number of bytes using the ARCFOUR encryption algorithm is disclosed. The system includes a system bus and an encryption accelerator arranged...
7263187 Batch mode session-based encryption of video on demand content  
A Video On Demand (VOD) method consistent with certain embodiments involves processing content to be delivered in a VOD method by selecting first portions of the content for encryption under a...
7257225 System and method for high speed reversible data encryption  
The present invention provides systems and methods for facilitating encryption and decryption of data. In accordance with an exemplary embodiment of the present invention, an encryption key having...
7254233 Fast encryption and authentication for data processing systems  
Methods and apparatus are presented for partially encrypting a data transmission, yet providing authentication for all of the data transmission. Plaintext blocks are combined with noise blocks and...
7242767 Recording medium, data recording method and apparatus, data regenerating method and apparatus, and copy control method  
Data is recorded in a first part PA 1 in accordance with a signal format same as that of an existing CD at the lower limit (1.5 μm) of an allowable value of a Wreck pitch and the lower limit (1.2...
7240195 Certified shuffle-decrypting system, certified shuffle-decrypting method and certified shuffle-decryption verifying method  
The present invention provides a certified shuffle-decrypting system, which does not require shuffled encrypted texts to be output, and in which the amounts of calculation and certificates are...
7236593 Apparatus for encryption and decryption, capable of use in encryption and decryption of advanced encryption standard  
An apparatus for encryption and decryption, capable of use in encryption and decryption of advanced encryption standard. Byte substitution operation and inverse byte substitution operation are to...
7236592 Efficient stream cipher system and method  
A computer system and method generates a random output stream of bits. The system comprises an initial evolving state produced from one or more initial keys, one or more round functions, and one or...
7231046 Method for controlling connections to a mobile station  
The present invention is a novel and improved method for managing in a single location the ciphering keys and algorithms used for encrypting or ciphering the communications of a specific mobile...
7227948 Encryption apparatus and method, and decryption apparatus and method based on block encryption  
An encryption apparatus for block data, comprises a first processing unit randomizing the block data in units of first portions obtained by dividing the block data, and a second processing unit...
7224795 Variable-length key cryptosystem  
A variable-length key cryptosystem is provided, in which the amount of parameters for generating a key to be shared is small, security is high, and calculation cost is small. The length of a plain...
7221757 Method and system for accelerated data encryption  
An encrypted private session key for a private-key encryption method is quickly exchanged between a first device and a second device by computing encryption acceleration data using a public key for...
7215770 System and method for partially encrypted multimedia stream  
A multimedia stream head end includes a legacy conditional access (CA) device that fully encrypts the stream using legacy keys. A copy of the stream is sent to a secondary CA device that encrypts...
7212634 Data distribution  
In a data distribution system, data is divided into a number of application data units. A sequence of keys is generated systematically, and a different key is used to encrypt each data unit at the...
7209556 Encryption apparatus and method, and decryption apparatus and method based on block encryption  
An encryption apparatus for block data, comprises a first processing unit randomizing the block data in units of first portions obtained by dividing the block data, and a second processing unit...
7197142 System and methods for a vernam stream cipher  
The invention discloses a cryptographic system and consisting of three methods: a cryptographic Vernam stream cipher that permits software programs on separate computers to encrypt and decrypt...
7194090 Encryption apparatus, decryption apparatus, expanded key generating apparatus and method therefor, and recording medium  
Expanded key schedule circuit for common key encryption system in which expanded keys are used in a predetermined order in data randomizing process for encryption and in a reversed order in data...
7191335 Method and apparatus for encrypted transmission  
A method of encryption of data in a digital television system communicated between a first decoder and a portable security module, wherein a precalculated key pair is stored in a memory of the...
7190790 Multiple module encryption method  
The present invention proposes an encryption/decryption method able to resist against various attack strategies such as Simple Power Analysis, Timing Analysis or Differential Power Analysis. The...
Matches 1 - 50 out of 265 1 2 3 4 5 6 >