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Class Information
Number: 380/56
Name: Cryptography > Selectively movable element having code characters
Description: Subject matter for encrypting a message signal which is composed of distinct intelligible characters which are visibly positioned on relatively movable surfaces to enable transposing or substituting such characters.










Sub-classes under this class:

Class Number Class Name Patents
380/57 Rotatable 20


Patents under this class:

Patent Number Title Of Patent Date Issued
8532289 Fast computation of a single coefficient in an inverse polynomial Sep. 10, 2013
8520848 Secure password management using keyboard layout Aug. 27, 2013
8484455 Online data encryption and decryption Jul. 9, 2013
8362875 Secure system for non-covert user authentication and identification Jan. 29, 2013
8301897 Challenge-based authentication protocol Oct. 30, 2012
8281147 Image based shared secret proxy for secure password entry Oct. 2, 2012
7894600 Encrypting apparatus and encrypting method Feb. 22, 2011
7822990 Online data encryption and decryption Oct. 26, 2010
7792291 XOR encoded document for secure message exchange Sep. 7, 2010
7715554 Prime number determining method May. 11, 2010
7646868 Method for steganographic cryptography Jan. 12, 2010
7616764 Online data encryption and decryption Nov. 10, 2009
7436956 Document encryption Oct. 14, 2008
7369659 Item handling system May. 6, 2008
7242770 Secure encryption/decryption for elevators Jul. 10, 2007
6909783 Alphabet soup cryptography Jun. 21, 2005
6826281 Storage-encryption-retrieval device and method with resulting business processes Nov. 30, 2004
6621933 MPEG2 moving picture encoding/decoding system Sep. 16, 2003
6571336 Method and apparatus for securing a list of passwords and personal identification numbers May. 27, 2003
6253328 Method and apparatus for securing passwords and personal identification numbers Jun. 26, 2001
6209097 Content protection method and content protection system Mar. 27, 2001
6175625 Control circuits for electric coding machines Jan. 16, 2001
6130946 Cryptographs Oct. 10, 2000
6097812 Cryptographic system Aug. 1, 2000
6085178 Apparatus and method for communicating between an intelligent agent and client computer process using disguised messages Jul. 4, 2000
6055635 Method and device for facilitating access to a multitude of alphanumeric sequences Apr. 25, 2000
5629770 Document copying deterrent method using line and word shift techniques May. 13, 1997
5321755 Information-encrypting device and method Jun. 14, 1994
5307414 Encryption template Apr. 26, 1994
5133554 Lotto ticket card holder Jul. 28, 1992
5077796 Cryptograph Dec. 31, 1991
5056142 Decryption device Oct. 8, 1991
5046096 Windowed rotatable cover which reveals one indicia on one surface and a second indicia on a second surface corresponding to the first that encodes and decodes messages Sep. 3, 1991
5042157 Fiber optic angular orientation sensor digital serial encoding Aug. 27, 1991
4885779 Personal identification encryptor system with error-correcting code and method Dec. 5, 1989
4870683 Personal identification encryptor system and method Sep. 26, 1989
4664418 Order handling sheet and method May. 12, 1987
4560164 Toy puzzle Dec. 24, 1985











 
 
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