Matches 1 - 50 out of 99 1 2 >
Match Document Document Title
7623723 Method for random point and patterned noise reduction in digital images  
A technique is provided for filtering noise in digital image data, particularly random point or spike noise. Image data may be rank order filtered and absolute differences between ordered values...
7522727 Method and apparatus for providing authentication in a communication system  
A method includes receiving an authentication request from a mobile station ( 401 ) and determining whether to forward the request to an authentication agent. When it is determined to forward the...
7505594 Discontinuous transmission (DTX) controller system and method  
A method and apparatus for controlling a discontinuous transmission process. Audio information is digitized and provided to a vocoder. A voice activity level is determined from the digitized audio...
7474749 Method and apparatus for achieving crypto-syncronization in a packet data communication system  
A method and apparatus for achieving crypto-syncronization in a packet data communication system employing cryptographic communications. In a transmitter, a state vector is incremented at a...
7434052 Method and device for producing an encrypted payload data stream and method and device for decrypting an encrypted payload data stream  
In a method for producing an encrypted method payload data stream comprising a header and a block containing encrypted payload data, a payload data key for a payload data encryption algorithm for...
7369662 Maintaining end-to-end synchronization on a telecommunications connection  
A method and an arrangement maintain end-to-end synchronization on a telecommunications connection transmitting data in frames substantially in real time and using synchronized end-to-end...
7366917 System and method for accessing discrete data  
A method for accessing discrete data includes transmitting a write command to a memory, determining whether each data following a header of the file needs to be encrypted according to a data format...
7362864 Framing of transmit encoded data and linear feedback shifting  
Framing transmit encoded output data begins by determining a scrambling remainder between scrambling of an input code word in accordance with a 1 st scrambling protocol and the scrambling of the...
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...
7251729 Authentication method for establishing connection between devices  
An authentication method for establishing a connection between devices that want to communicate data in a communication environment using communication specification such as Bluetooth is provided....
7245725 Dual processor framer  
A dual processor framer includes a receiver and a transmitter which share common circuitry and/or code. Separate direct memory access controllers may be used for each of the receiver and...
7188248 Recovering from de-synchronization attacks against watermarking and fingerprinting  
The invention provides a method of recovering from de-synchronization attacks includes registering original and altered digital content using nonlinear transformations to iteratively attempt to...
7155011 Encryption method, decryption method, and recording and reproducing apparatus  
The present invention relates to an encryption method for encrypting information including a series of multiple unit blocks, one at a time, a decryption method for decrypting multiple encrypted...
7051203 Data watermarks created by using an uneven sampling period  
Input signals are electronically watermarked using an uneven or non-uniform sampling rate. The uneven or non-uniform sampling may be pseudo-random. The uneven or non-uniform sampling meets the...
7023992 Data multiplexing device, program distribution system, program transmission system, pay broadcast system, program transmission method, conditional access system, and data reception device  
In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream...
7006634 Hardware-based encryption/decryption employing dual ported key storage  
A system for the encryption and decryption of data employing dual ported RAM for key storage to accelerate data processing operations. The on-chip key storage includes a dual-ported memory device...
7003114 Method and apparatus for achieving crypto-synchronization in a packet data communication system  
A method and apparatus for achieving crypto-syncronization in a packet data communication system employing cryptographic communications. In a transmitter, a state vector is incremented at a...
6952480 Self-synchronous data scrambler  
An encryption system has been provided to self-synchronously scramble communications where the receiver must recover the clock information from the data stream, such as the SONET format. To prevent...
6925183 Preventing shortened lifetimes of security keys in a wireless communications security system  
23A wireless communications device has a first security key, a second security key, and established channels. Each established channel has a corresponding security count value, and utilizes a...
6920557 System and method for wireless user interface for business machines  
A method and system for providing external user interfaces is described. In one configuration a co-located external processor and a business machine negotiate a communications connection. The...
6778670 Method and apparatus for encryption and decryption  
A method and apparatus are provided for encrypting a stream of data transmitted within a frame. The method includes determining a first initialization state in a first preselected interval, and...
6654885 Method for authorization checking and configuration for carrying out the method  
The system checks whether authorization exists for at least two data processing devices to exchange data with one another. In the preferred embodiment, both data processing devices are of identical...
6560338 Limiting delays associated with the generation of encryption stream ciphers  
A method and an apparatus for generating encryption stream ciphers are based on a recurrence relation designed to operate over finite fields larger than GF(2). A non-linear output can be obtained...
6408077 Descrambling device of a security element and security element comprising such a device  
In a device for descrambling scrambled digital data, the digital data are grouped into parallel combinations of bits before being descrambled. The combinations of bits are descrambled and then...
6385319 Encoding circuit and method of detecting block code boundary and establishing synchronization between scrambler and descrambler  
The present invention comprises the bus reset detection circuit 6 detecting a bus reset signal from the network initiation/control state machine, the bus reset identification code generation...
6215876 Apparatus for and method of detecting initialization vector errors and maintaining cryptographic synchronization without substantial increase in overhead  
An apparatus and method for detecting erroneous initialization vectors transmitted over a communications channel and maintaining cryptographic synchronization by comparing a received vector with a...
6005940 System for securely storing and reading encrypted data on a data medium using a transponder  
A self contained data medium is provided with an apparatus for generating a decrypting key for decrypting stored data. Frames of encrypted data are stored on the data medium such as a video or...
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...
5966450 Variable mask for encryption generated independently at communications stations  
Frames of data are encrypted by combining each of the frames with a mask that varies from frame to frame. The mask is obtained by using a frame counter as the seed for a pseudo random number...
5881154 Data scramble transmission system  
A data scramble transmission system with a data transmission link coupled between sending and receiving ends is provided. The link adopts transmission frames each of which is constituted by data...
5838797 Secure communication by encryption/decryption of vector at PSK modulation/detection stage  
At the transmit end of a secure communication system, an input data symbol is mapped to a corresponding vector in a two-dimensional phase plane. The vector is pseudorandomly phase-rotated in a...
5784462 Digital signal receiver capable of receiving data encrypted and transmitted in online processing  
In a decoding processing circuit of a digital signal receiver, a first comparison circuit detects that a prefix of packet data is inputted in a shift register on the basis of a count value of a...
5778075 Methods and systems for mobile terminal assisted handover in an private radio communications network  
Mobile assisted handover of an encrypted traffic connection between linked base stations of a private radio communications network are provided in a system including a plurality of base stations...
5727064 Cryptographic system for wireless communications  
A wireless communications system (110) with increased privacy. The system (110) transmits an encrypted signal between a base station (112) and a wireless terminal (122). In the forward channel, the...
5717762 WACS-type mobile communication with a unified frame format  
In a mobile communication system of the WACS type, frame formats are unified for DSL, HDSL, and DS1 channels. In addition, each novel base station (25) comprises a radio frame number processor for...
5717761 Data transmission system capable of carrying out a data transmission with a high security  
A transmission section is responsive to first through K-th data signals to transmit a transmission signal through a transmission path to a reception section. The transmission signal has first...
5710815 Encoder apparatus and decoder apparatus for a television signal having embedded viewer access control data  
An encoding apparatus and an associated decoding apparatus for a television signal having embedded viewer access control data. A program category code is inserted into a television signal by the...
5689568 Medium access control for a mobile satellite system  
The present invention provides a medium access control (MAC) layer in a mobile satellite system. The MAC transfers data across the physical channels in the air interface between the mobile...
5652796 Data encryption control system  
The data encryption system includes a first stage and a second stage data encryption engine in combination with a micro control system. The data encryption system is responsive to control signals...
5592554 Method for data security in a digital telecommunication system  
For data security in a digital telecommunication system having a plurality of subscriber equipment, a public key is respectively calculated from a secret key prescribed in a first subscriber...
5559890 Crypto equipment  
For the transmission of information, such as voice and data that it is necessary to keep secret, it is standard to encode the information at the transmitting side in the digital level and to in...
5511124 Cryptographic equipment  
In the transmission of information which require secrecy, such as voice and data, serial bit streams having bit rates of more than 100 Mbit can occur, particularly given digital signal hierarchies...
5488663 Encoding methods for generating a digital signal containing modulated bit allocation information, and record carriers containing that signal  
Transmission system for transmitting and receiving, and subband encoding methods for generating for transmission, digital signals containing modulated bit allocation information; and record...
5488659 Encryption/decryption process and apparatus for a multichannel television system  
An encryption/decryption system which facilitates simultaneous decryption of multiple encrypted television signals thus making them simultaneously available for direct tuning in television...
5375171 Transmission system, and transmitter and receiver used in the transmission system for transmitting and receiving digital signals containing modulated bit allocation information  
Transmission system, and transmitter and receiver for use in the transmission system for transmitting and receiving digital signals containing modulated bit allocation information. The transmitter...
5361302 Method for encryption sync compression in an encrypted radio telephone interconnect system  
A method for transparently coupling an encrypted two-way RF communication unit (100) with an encrypted landline communication unit (104). An RF message comprised of a plurality of data frames...
5321754 Sequence synchronization  
A data sequence is transmitted from a transmitter to a receiver, being scrambled at the transmitter by adding a pseudo random sequence (PRS) thereto. At the receiver the received data is...
5319707 System and method for multiplexing a plurality of digital program services for transmission to remote locations  
A system and method for multiplexing a plurality of digital programs for transmission to a plurality of remote locations is claimed. An encoder is provided that first generates a plurality of...
5297208 Secure file transfer system and method  
This invention is a system and method for securely and robustly transferring a file from one computer to another without having a prearranged encryption key. Data is transferred by first generating...
Matches 1 - 50 out of 99 1 2 >