Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8090101 | Method and system for generating a secret key from joint randomness A method and system for generating a secret key from joint randomness shared by wireless transmit/receive units (WTRUs) are disclosed. A first WTRU and a second WTRU perform channel estimation to generate a sampled channel impulse response (CIR) on a channel between... | 01/03/2012 |
| 7974410 | Cryptographic key split combiner A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce a cryptographic key, and a process for forming cryptographi... | 07/05/2011 |
| 7864954 | Method and system for encryption and authentication A method and a system for encrypted transmission or authentication between at least two units via an insecure communication channel, comprising the steps of: (a) in an initiation procedure, producing a common original value to be used in the respective units; (b) sy... | 01/04/2011 |
| 7434054 | Asynchronous enhanced shared secret provisioning protocol An Asynchronous Enhanced Shared Secret Provisioning Protocol (ESSPP) provides a novel method and system for adding devices to a network in a secure manner. A registration process is launched by at least one of two network devices together. These two devices then aut... | 10/07/2008 |
| 7418736 | Network security system Security is provided in a network system. A message is received from a user, which message requires authentication of the user. An authentication message is sent indicating the identity of the user to an initial software security agent. The software security agent, ... | 08/26/2008 |
| 7406175 | Key generator device, encoding/decoding device, and key generation method Disclosed is a key generator, which assures the security of a key by preventing a circuit designer and other persons from readily knowing the value of the key. Random number generator circuits (51, 52, 53 and so on) generate random numbers respectively in acc... | 07/29/2008 |
| 7403619 | Interface module and decoder for host The present invention relates to an interface module for a host (2) such as a digital television decoder, permitting the processing of information coming from the host (2) in a conditioned manner subject to a conditional access system (11), comp... | 07/22/2008 |
| 7386131 | Tolerant digital certificate distribute system and distribute method A digital certificate issuing system with intrusion tolerance ability and the issuing method thereof are disclosed. The system comprises an offline secret key distributor, at least one online task distributor, k online secret share calculators and m online secret sh... | 06/10/2008 |
| 7363499 | Blinded encryption and decryption A method and system for utilizing and encryption or decryption agent so as to preclude access by the encryption agent or decryption agent, respectively, to the information being encrypted or decrypted. To preclude access by the encryption agent, a blinding function ... | 04/22/2008 |
| 7362863 | DES hardware throughput for short operations A symmetric key cryptographic method is provided for short operations. The method includes batching a plurality of operation parameters (1503), and performing an operation according to a corresponding operation parameter (1505). The symmetric key crypt... | 04/22/2008 |
| 7362867 | Apparatus and method for generating scrambling code in UMTS mobile communication system A scrambling code generating apparatus of a downlink transmitter in a UMTS mobile communication system, which uses one primary scrambling code for separation of base stations and multiple secondary scrambling codes for channel separation. The apparatus includes a fi... | 04/22/2008 |
| 7350077 | 802.11 using a compressed reassociation exchange to facilitate fast handoff A method and system for handling roaming mobile nodes in a wireless network. The system uses a Subnet Context Manager to store current Network session keys, security policy and duration of the session (e.g. session timeout) for mobile nodes, which is established whe... | 03/25/2008 |
| 7350069 | System and method which employs a multi user secure scheme utilizing shared keys We propose a multi user information theoretically secure scheme. Our scheme allows any two parties in a multi user system to exchange messages securely using encryption, and to sign messages. Our scheme achieves a significant saving in the number of total keys in th... | 03/25/2008 |
| 7349545 | Key agreement method in secure communication system using multiple access method A key agreement method for secure communication in a multiple access system is provided. A key agreement method for secure communication in a multiple access system, the key agreement method includes the steps of (a) a first user, modulating signals from a so... | 03/25/2008 |
| 7313195 | PAPR reduction method using bit reallocation A PAPR reduction method using bit reallocation is disclosed, which is applied in a multi-carrier system. The lowest total transmission power P is achieved by a bit loading algorithm conditioned on the requirement of total D transmission bits per block. When the PAPR... | 12/25/2007 |
| 7308104 | Forward multiple scrambling code generating method and apparatus Disclosed are a forward multiple scrambling code generating method and apparatus in a communication system. Each base station uses primary scrambling codes and an associated one of secondary scrambling code sets, each consisting of a plurality of secondary scramblin... | 12/11/2007 |
| 7302058 | Method and apparatus for securing control words In accordance with one embodiment, a method for securing control words is provided. The method includes receiving scrambled digital content in a descrambler integrated circuit. The method further includes receiving an encrypted control word in the descrambler integr... | 11/27/2007 |
| 7302415 | Data copyright management system A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication network for connecting these sections. Data supplied from t... | 11/27/2007 |
| 7286665 | System and method for transferring the right to decode messages Methods for transferring among key holders in encoding and cryptographic systems the right to decode and decrypt messages in a way that does not explicitly reveal decoding and decrypting keys used and the original messages. Such methods are more secure and more effi... | 10/23/2007 |
| 7280659 | Pseudorandom number generating apparatus or encryption or decryption apparatus using the same In a buffer and a state included in a pseudorandom number generating apparatus, the state has the configuration of assuming that the unit length of data processing is n, the state has a size of 3×n bits, and the buffer has a capacity of 32×n bits, and according to... | 10/09/2007 |
| 7277543 | Cryptographic combiner using two sequential non-associative operations A stream cipher cryptosystem includes a keystream generator receiving a key and providing a keystream. A cryptographic combiner combines a first binary data sequence and the keystream with two non-associative operations to provide a second binary data sequence. In e... | 10/02/2007 |
| 7269736 | Distributed cryptographic methods and arrangements First and second computing devices are selectively operatively coupled together. The first device provides data to the second device. The second device can be a portable computing device. The second device is configured to encrypt/decrypt the data, as needed by the ... | 09/11/2007 |
| 7263191 | Method and apparatus for encrypting data A method for encrypting data comprising dividing a first data set into a second data set and a third data set; deriving a first value using the second data set as an input into a polynomial equation; deriving a second value using the third data set as an input into ... | 08/28/2007 |
| 7260215 | Method for encryption in an un-trusted environment A method and apparatus for secure distribution of information over a network, comprising: encrypting payload information using a first encryption key in a first data processor; sending the payload information encrypted using the first encryption key to a second data... | 08/21/2007 |
| 7248691 | Hashing using multiple sub-hashes A hashing structure including multiple sub-hashes is used to determine whether an input value matches one or more of multiple target values. These values can be of any form, such as security identifiers in an access control system. To make the determination, a hash ... | 07/24/2007 |
| 7248692 | Method of and apparatus for determining a key pair and for generating RSA keys In a method of determining a pair of numbers comprising a first number and a second number, in which the first number may be a first key and the second number may be a second key of an encryption system and the second number is the multiplicative inverse with respec... | 07/24/2007 |
| 7245721 | Data encoding/decoding device and apparatus using the same A data encoding device has a serial data input and an encoded serial data output. The serial input is supplied to an encoding unit which combines each input bit with a plurality of additional encoding bits, to derive an encoded output bit and a plurality of updated ... | 07/17/2007 |
| 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 be combined. Byte substitution operation can be expressed as y=M*multi... | 06/26/2007 |
| 7227956 | Simple encrypted transmission system suitable for intermittent signals A signal transmitted from a first device to a second device is encrypted using an encryption key generated from a preceding part of the signal itself. The signal is decrypted in the second device using a decryption key generated from a preceding part of the received... | 06/05/2007 |
| 7225164 | Method and apparatus for implementing revocation in broadcast networks A method of revoking a descrambling privilege for copy controlled content to a host device is provided. The method includes receiving copy controlled content at a conditional access module. A revocation list is also received at the module. The method includes determ... | 05/29/2007 |
| 7224796 | Pseudorandom number generating apparatus or encryption or decryption apparatus using the same In a buffer and a state included in a pseudorandom number generating apparatus, the state has the configuration of assuming that the unit length of data processing is n, the state has a size of 3×n bits, and the buffer has a capacity of 32×n bits, and according to... | 05/29/2007 |
| 7212632 | Cryptographic key split combiner A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce a cryptographic key, and a process for forming cryptographi... | 05/01/2007 |
| 7212633 | Expansion key generating device, encryption device and encryption system An expansion key generating device that receives encryption key data as input, and outputs plural expansion key data, comprising: a data dividing unit operable to divide the encryption key data into plural part key data; and plural key conversion units being connect... | 05/01/2007 |
| 7197495 | Searching system, searching unit, searching method, displaying method for search results, terminal unit, inputting unit, and record medium A searching system for searching contents that were broadcast, the searching system having an inputting unit, a searching unit, and a terminal unit is disclosed, wherein the inputting unit comprises a first storing means for storing information representing at least... | 03/27/2007 |
| 7194496 | System and method for producing functions for generating pseudo-random bit sequences In a system and method for producing functions for generating pseudo-random bit sequences, an extended shift register (ESR) is formed. Each bit in the ESR is shifted to a next higher bit and the lowest-order bit is replaced with an EXCLUSIVE-OR operation of at least... | 03/20/2007 |
| 7191155 | License transmitting and distributing system under offline environment and method thereof An LA (License Agent) (or a license chip having the same function as the LA) is disposed in a PC (Personal Computer), a content distribution server, and a medium attached to a PD (Private Device or Portable Device) that use a license for electronic data. A content a... | 03/13/2007 |
| 7181632 | Data processing apparatus and method for operating a data processing module for secure power saving A data processing apparatus comprises a data processing module, which can be operated in a first operating mode with a normal power consumption and a second operating mode, wherein a power consumption of the data processing module in the second operating mode is sma... | 02/20/2007 |
| 7165180 | Monolithic semiconductor device for preventing external access to an encryption key A monolithic semiconductor device having an encryption engine and encryption key register to store one or more encryption keys, where the contents of the encryption key register are observable, or can be made observable, only to internal components of the device is ... | 01/16/2007 |
| 7159245 | Method for protecting a portable card A method for protecting a portable card, provided with at least a crypto algorithm for enciphering data and/or authenticating the card, against deriving the secret key through statistical analysis of its information leaking away to the outside world in the event of ... | 01/02/2007 |
| 7149308 | Cryptographic communications using in situ generated cryptographic keys for conditional access A system and method for cryptographic communication among multiple users and a central service provider using in situ generated cryptographic keys. Each user communicates with the central service provider preferably using a user communication interface that includes... | 12/12/2006 |
