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公开(公告)号：DE68926670T2
公开(公告)日：1996-12-19
申请号：DE68926670
申请日：1989-01-03
Applicant: MOTOROLA INC
Inventor： DABBISH EZZAT , BYRNS JOHN , MCCLAUGHRY MICHAEL , PUHL LARRY , BROWN DANIEL , ZIOLKO ERIC , BRIGHT MICHAEL
Abstract: A cryptographic apparatus for encrypting and decrypting digital words includes a mechanism that permits a cipher algorithm to be electronically stored after the manufacture of the apparatus. The storing mechanism includes at least one electrically erasable, programmable gate array containing a portion of the cipher algorithm and at least one random access memory device coupled to the array for storing digital data generated by the algorithm. A mechanism which is coupled to the gate array and memory device controls the execution of the algorithm for each digital word thereby decrypting encrypted digital words and encrypting non-encrypted digital words.
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公开(公告)号：GB2397203A
公开(公告)日：2004-07-14
申请号：GB0400419
申请日：2004-01-09
Applicant: MOTOROLA INC
Inventor： SHAFFER RONALD , BRIGHT MICHAEL
Abstract: A transmitting device (100) generates a message (102). The message has a message length (104) and comprises message data (106). A key input (108) is identified, and a message authentication key (112) is derived based on the key input and the message length. Based on the message authentication key and the message data, a message authentication code (118) is derived, which is used to authenticate the message. The MAC may be generated using Cipher Block Chaining (CBC-MAC). The key input (108) may be any key used for authentication, encryption etc. The method is resistant to forgery extension attack and requires the management of a small number of keys.
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公开(公告)号：GB2397203B
公开(公告)日：2005-04-06
申请号：GB0400419
申请日：2004-01-09
Applicant: MOTOROLA INC
Inventor： SHAFFER RONALD , BRIGHT MICHAEL
Abstract: A transmitting device (100) generates a message (102). The message has a message length (104) and comprises message data (106). A key input (108) is identified, and a message authentication key (112) is derived based on the key input and the message length. Based on the message authentication key and the message data, a message authentication code (118) is derived, which is used to authenticate the message.
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公开(公告)号：DE68926670D1
公开(公告)日：1996-07-18
申请号：DE68926670
申请日：1989-01-03
Applicant: MOTOROLA INC
Inventor： DABBISH EZZAT , BYRNS JOHN , MCCLAUGHRY MICHAEL , PUHL LARRY , BROWN DANIEL , ZIOLKO ERIC , BRIGHT MICHAEL
Abstract: A cryptographic apparatus for encrypting and decrypting digital words includes a mechanism that permits a cipher algorithm to be electronically stored after the manufacture of the apparatus. The storing mechanism includes at least one electrically erasable, programmable gate array containing a portion of the cipher algorithm and at least one random access memory device coupled to the array for storing digital data generated by the algorithm. A mechanism which is coupled to the gate array and memory device controls the execution of the algorithm for each digital word thereby decrypting encrypted digital words and encrypting non-encrypted digital words.
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