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Class Information
Number: 380/265
Name: Cryptography > Communication system using cryptography > Symmetric key cryptography > Combining outputs of shift register
Description: Subject matter wherein the encryption or decryption includes summing the taps from individual stages of a shift register.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7522727 |
Method and apparatus for providing authentication in a communication system |
Apr. 21, 2009 |
| 7502468 |
Method and system for generating a cryptographically random number stream |
Mar. 10, 2009 |
| 7496196 |
Method apparatus and system of performing one or more encryption and/or decryption operations |
Feb. 24, 2009 |
| 7424116 |
Method and apparatus for providing authentication in a communication system |
Sep. 9, 2008 |
| 7334131 |
Protected storage of a datum in an integrated circuit |
Feb. 19, 2008 |
| 7289558 |
Infinite impulse response multiplierless digital filter architecture |
Oct. 30, 2007 |
| 7277543 |
Cryptographic combiner using two sequential non-associative operations |
Oct. 2, 2007 |
| 7263191 |
Method and apparatus for encrypting data |
Aug. 28, 2007 |
| 7248697 |
Apparatus and method for scrambling and descrambling data wordwise in optical disk system |
Jul. 24, 2007 |
| 7194617 |
Method and apparatus to prevent the unauthorized copying of digital information |
Mar. 20, 2007 |
| 7191340 |
Generation of a secret quantity based on an identifier of an integrated circuit |
Mar. 13, 2007 |
| 7177421 |
Authentication engine architecture and method |
Feb. 13, 2007 |
| 7174014 |
Method and system for performing permutations with bit permutation instructions |
Feb. 6, 2007 |
| 7171564 |
Universal password generation method |
Jan. 30, 2007 |
| 7159245 |
Method for protecting a portable card |
Jan. 2, 2007 |
| 7123720 |
Key scheduler for encryption apparatus using data encryption standard algorithm |
Oct. 17, 2006 |
| 7106859 |
Parallel data scrambler |
Sep. 12, 2006 |
| 7068788 |
Data encryption for suppression of data-related in-band harmonics in digital to analog converters |
Jun. 27, 2006 |
| 7046803 |
Random keystream generation apparatus and method for use in an encryption system |
May. 16, 2006 |
| 7039185 |
Method and system for securing a printhead in a closed system metering device |
May. 2, 2006 |
| 7024560 |
Power-residue calculating unit using Montgomery algorithm |
Apr. 4, 2006 |
| 7020281 |
Timing attack resistant cryptographic system |
Mar. 28, 2006 |
| 6980658 |
Method and apparatus for encrypting transmissions in a communication system |
Dec. 27, 2005 |
| 6961427 |
Methods and apparatus for keystream generation |
Nov. 1, 2005 |
| 6943664 |
Process for controlling the resynchronization of a remote control with a changing code |
Sep. 13, 2005 |
| 6895090 |
Pseudo-noise sequence with insertion having variant length and position |
May. 17, 2005 |
| 6891952 |
Dynamic key generation and confidential synchronization of encryption components |
May. 10, 2005 |
| 6785389 |
System for bitstream generation |
Aug. 31, 2004 |
| 6778670 |
Method and apparatus for encryption and decryption |
Aug. 17, 2004 |
| 6754345 |
Pseudorandom number generation circuit and data communication system employing the same |
Jun. 22, 2004 |
| 6754824 |
Modulated message authentication system and method |
Jun. 22, 2004 |
| 6707914 |
System and method for encrypting information within a communications network |
Mar. 16, 2004 |
| 6522749 |
Quantum cryptographic communication channel based on quantum coherence |
Feb. 18, 2003 |
| 6490357 |
Method and apparatus for generating encryption stream ciphers |
Dec. 3, 2002 |
| 6373951 |
Synchronization technique and method and apparatus for transmitting and receiving coded signals |
Apr. 16, 2002 |
| 6356637 |
Field programmable gate arrays |
Mar. 12, 2002 |
| 6324288 |
Cipher core in a content protection system |
Nov. 27, 2001 |
| 6282291 |
Method and apparatus for encrypting input bit sequence |
Aug. 28, 2001 |
| 6263082 |
Pseudorandom number generation circuit and data communication system employing the same |
Jul. 17, 2001 |
| 6201870 |
Pseudorandom noise sequence generator |
Mar. 13, 2001 |
| 6151393 |
Device and method for modular multiplication |
Nov. 21, 2000 |
| 6125183 |
Cryptosystem for optical storage |
Sep. 26, 2000 |
| 6097815 |
Method of and an apparatus for generating pseudo-random numbers |
Aug. 1, 2000 |
| 6064740 |
Method and apparatus for masking modulo exponentiation calculations in an integrated circuit |
May. 16, 2000 |
| 6049608 |
Variable length nonlinear feedback shift registers with dynamically allocated taps |
Apr. 11, 2000 |
| 6009135 |
Method and apparatus for generating a stream cipher |
Dec. 28, 1999 |
| 5995629 |
Encoding device |
Nov. 30, 1999 |
| 5978486 |
Data scrambling method, data scrambling apparatus, data descrambling method, and data descrambling apparatus |
Nov. 2, 1999 |
| 5970148 |
Low cost encryption transponder |
Oct. 19, 1999 |
| 5966447 |
Data scrambling method, data scrambling apparatus, data descrambling method, and data descrambling apparatus |
Oct. 12, 1999 |
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