| 6269163 |
Enhanced block ciphers with data-dependent rotations |
| Jul-31-2001 |
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 words,... |
| 6266412 |
Encrypting speech coder |
| Jul-24-2001 |
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 incorporating... |
| 6246767 |
Source authentication of download information in a conditional access system |
| Jun-12-2001 |
A cable television system provides conditional access to services. The cable television system includes a headend from which service "instances", or programs, are broadcast and a plurality of set top units... |
| 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... |
| 6178507 |
Data card verification system |
| Jan-23-2001 |
A method for verifying the authenticity of messages exchanged between a pair of correspondents in an electronic conducted over a data transmission system where the correspondents each include respective... |
| 6160890 |
Secret key transfer method which is highly secure and can restrict the damage caused when the secret key is leaked or decoded |
| Dec-12-2000 |
A transmission apparatus 100 includes a secret key storage unit 103 that stores three secret keys K1, K2 and K3, a secret key selection unit 104 that selects one secret key Ks from the secret keys, a message... |
| 6151394 |
Encrypted communication system that limits the damage caused when a secret key has been leaked |
| Nov-21-2000 |
In an encrypted transmission system composed of one transmission apparatus 10 and twenty-eight reception apparatuses A1-G4 that are classified into seven groups A-G, two secret key exclusively selected... |
| 6141421 |
Method and apparatus for generating hash value |
| Oct-31-2000 |
A method and apparatus for generating a highly secured hash value without deteriorating the processing speed is provided. A hash function such that when a message M is given, the message M is compressed... |
| 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... |
| 6125184 |
Method and apparatus for an adapter card providing conditional access in a communication system |
| Sep-26-2000 |
A method and apparatus for an adapter card, for use in a computer, to provide conditional access by the computer to incoming data streams while maintaining the security of information by maintaining a... |
| 6104810 |
Pseudorandom number generator with backup and restoration capability |
| Aug-15-2000 |
Pseudorandom numbers are generated in a cryptographic module in a cryptographically strong manner by combining a time-dependent value with a secret value and passing the result through a one-way hash function... |
| 6094487 |
Apparatus and method for encryption key generation |
| Jul-25-2000 |
An encryption key generation system generates encryption keys at both an originating terminal and a terminating terminal of a wireless network. A central controller generates a shared secret based on the... |
| 6084966 |
Communicating encrypted signals in which random bits and random bit position data are inserted |
| Jul-4-2000 |
A transmitted signal is enciphered or concealed to thereby prevent interference, even when data indicative of the receiver terminal is made public because of the use of a common access channel. In the... |
| 6047070 |
Process for ensuring a securing interface between a telephone with a card and the network in a telephone system |
| Apr-4-2000 |
In the method for dialing only preprogrammed telephone numbers, it is provided that when there is a desire for access or connection, the telephone number is transmitted from the telephone to the card,... |
| 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... |
| 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... |
| 6028931 |
EPROM encryption code decoding prevention circuit for semiconductor memory device |
| Feb-22-2000 |
An encryption code decoding prevention circuit for a semiconductor memory device, such as an EPROM, includes a plurality of encryption code cells, an encryption word line operator, a word line operator,... |
| 6014445 |
Enciphering/deciphering apparatus and method incorporating random variable and keystream generation |
| Jan-11-2000 |
An enciphering apparatus embodying this invention comprises chaos generation means for generating a real-valued sequence along a chaotic orbit in accordance with a predetermined number of first common... |
| 6009174 |
Secret key transfer method which is highly secure and can restrict the damage caused when the secret key is leaked or decoded |
| Dec-28-1999 |
A transmission apparatus 100 includes a secret key storage unit 103 that stores three secret keys K1, K2 and K3, a secret key selection unit 104 that selects one secret key Ks from the secret keys, a message... |
| 6005939 |
Method and apparatus for storing an internet user's identity and access rights to world wide web resources |
| Dec-21-1999 |
A method and apparatus for obtaining user information to conduct secure transactions on the Internet without having to re-enter the information multiple times is described. The method and apparatus can... |
| 5987139 |
Method for encryption of information |
| Nov-16-1999 |
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 pseudo-random... |
| 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... |
| 5978483 |
Securely encrypted remote keyless entry system |
| Nov-2-1999 |
A remote keyless entry system particularly suited for preventing access to unauthorized individuals by securely encrypting messages transmitted from a remote transmitter to a receiver. A unique encryption... |
| 5978481 |
Modem compatible method and apparatus for encrypting data that is transparent to software applications |
| Nov-2-1999 |
A method and apparatus for transmitting encoded data from one computer system to another using an AT command set compatible communication device is described. Data being sent from a communications application... |
| 5956699 |
System for secured credit card transactions on the internet |
| Sep-21-1999 |
A method for providing secure credit card transactions over the Internet generates a personal charge number from a user account number by inserting a user key into the user account number in accordance... |
| 5943615 |
Method and apparatus for providing authentication security in a wireless communication system |
| Aug-24-1999 |
An apparatus for providing authentication of a mobile station in a wireless communication system. The present invention takes the number dialed by the mobile station user and computes the 24 bit number... |
| 5940002 |
Security system with random number remote communication |
| Aug-17-1999 |
A security system that is useful for protecting vehicles from theft and buildings from unauthorized entry, for example, includes utilizing random numbers within remotely transmitted signals. A remote signaling... |
| 5917914 |
DVD data descrambler for host interface and MPEG interface |
| Jun-29-1999 |
A descrambler for a Digital Versatile Disk (DVD) is provided within a DVD controller to allow for real-time descrambling of DVD data from the DVD buffer. The built-in descrambler also allows the controller... |
| 5917852 |
Data scrambling system and method and communications system incorporating same |
| Jun-29-1999 |
Users or subscribers of a multi-user communications system, such as a spread spectrum communications system, provide signals to the central station or base unit of that system, and receive signals therefrom.... |
| 5910986 |
Methods and apparatus for sending electronic data signals |
| Jun-8-1999 |
Where sensitive information forming part of a transactional flow application is required to be sent over an open network such as the Internet, for example from a World Wide Web site, a time stamp and a... |
| 5881154 |
Data scramble transmission system |
| Mar-9-1999 |
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 and control... |
| 5825886 |
Construction symmetric ciphers using the cast design procedure |
| Oct-20-1998 |
A new design procedure for constructing a family of DES-like Substitution-Permutation Network (SPN) cryptosystems with desirable cryptographic properties including provable resistance to differential cryptanalysis,... |
| 5805707 |
Radio pager with a display control capability |
| Sep-8-1998 |
In a radio pager, when encrypting information is attached to a received message, the message is written to an encrypted message memory in distinction from an ordinary message. The message stored in the... |
| 5799090 |
pad encryption method and software |
| Aug-25-1998 |
A pad encryption software architecture includes space on a floppy for storing the pad to be used with the encryption software. The pad is XOR generated with random numbers subject to redetermined offsets.... |
| 5796837 |
Apparatus and method for generating a secure substitution-box immune to cryptanalyses |
| Aug-18-1998 |
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 input of... |
| 5796836 |
Scalable key agile cryptography |
| Aug-18-1998 |
A system and method for encrypting blocks of plain text. Output FIFO memories are provided for decoupling pseudorandom vector generation from plain text encryption. The output FIFOs produce the effect... |
| 5793798 |
Virtual beam system |
| Aug-11-1998 |
A virtual beam system operating in an environment, including a non-compatible receiver, includes a transmitting subsystem and a receiving subsystem. The transmitting subsystem includes an array of transmitting... |
| 5793302 |
Method for securing information relevant to a transaction |
| Aug-11-1998 |
A transaction system wherein, when a transaction, document or thing needs to be authenticated, information associated with one or more of the parties involved is coded together to produce a joint code.... |
| 5784462 |
Digital signal receiver capable of receiving data encrypted and transmitted in online processing |
| Jul-21-1998 |
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 counter... |
| 5768390 |
Cryptographic system with masking |
| Jun-16-1998 |
A system for cryptographically transforming a sequence of input blocks of plaintext or ciphertext data into corresponding sequence of output blocks of data while providing enhanced protection against cryptographic... |
| 5745577 |
Symmetric cryptographic system for data encryption |
| Apr-28-1998 |
A novel symmetric cryptographic system for data encryption uses two different sets of (m.times.n) s-boxes in its round function in one embodiment, where m and n are different integers. It also includes... |
| 5733047 |
Enciphering system applicable to various keyless entry systems |
| Mar-31-1998 |
An enciphering system comprises a transmitter (1) and a receiver (2) communicatable with each other and incorporated in a keyless entry system. The transmitter (1) comprises a memory (11) for memorizing... |
| 5731756 |
Universal encrypted radio transmitter for multiple functions |
| Mar-24-1998 |
A control is provided for allowing a user to actuate various home security systems such as garage door openers, home alarm systems, lights, etc., remotely. A transmitter is provided with encryption logic... |
| 5727064 |
Cryptographic system for wireless communications |
| Mar-10-1998 |
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 base... |
| 5724428 |
Block encryption algorithm with data-dependent rotations |
| Mar-3-1998 |
A simple encryption and decryption device has been developed. The underlying algorithm is a fast block cipher that may be implemented efficiently in hardware or software. The algorithm makes heavy use... |
| 5717761 |
Data transmission system capable of carrying out a data transmission with a high security |
| Feb-10-1998 |
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 through K-th... |
| 5703952 |
Method and apparatus for generating a cipher stream |
| Dec-30-1997 |
A system for encrypting or decrypting a digital message comprising a linear driving subsystem (4) for generating a pseudo random data sequence, a non-linear feedback subsystem (6) for producing a cipher... |
| 5699415 |
Method for matching the database between an electronic postage meter machine and a data center |
| Dec-16-1997 |
In a method for matching the data base in an electronic postage meter to the database in a data center with which the postage meter is in communication, a transaction for adding credit to the postage meter... |
| 5699065 |
Remote control transmitter and method of operation |
| Dec-16-1997 |
A remote control transmitter capable of transmitting a coded signal for actuating a device connected to a remote receiver. The remote control transmitter includes an electronic control device which controls... |
| 5687238 |
Small size product cipher apparatus |
| Nov-11-1997 |
In a product cipher apparatus, a permutation is performed upon plaintext or ciphertext to generate a first message. At least two successive substitutions are performed upon the first message to generate... |
