Lucent Technologies Inc.

Alcatel Lucent

Robert John Rance

Semyon B Mizikovsky

Daniel Nelson Heer

Mark Howard Etzel

Robert Joseph McNelis

Robert John Frank

R Dale Shipp

An enhanced CMEA encryption system suitable for use in wireless telephony. A plaintext message is introduced into the system and subjected to a first iteration of a CMEA process, using a first CMEA key to produce an intermediate ciphertext. The intermediate ciphertext is then subjected to a second iteration of the CMEA process using a second CMEA key to produce a final ciphertext. Additional security is achieved by subjecting the plaintext and intermediate ciphertext to input and output transformations before and after each iteration of the CMEA process. The CMEA iterations may be performed using an improved use of a tbox function which adds permutations to a message or intermediate crypto-processed data. Decryption is achieved by subjecting a ciphertext message to the reverse order of the steps used for encryption, replacing the input and output transformations by inverse output and inverse input transformations, respectively, as appropriate.

Method and apparatus for multiple-iteration CMEA encryption and decryption for improved security for wireless telephone messages

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Andover, MA, United States of America

Robert John Rance