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    ENCRYPTION METHOD FOR MESSAGE IN CALL TO BE PROCESSED BY COMMUNICATION DEVICE
    3.
    发明专利
    ENCRYPTION METHOD FOR MESSAGE IN CALL TO BE PROCESSED BY COMMUNICATION DEVICE 审中-公开

    公开(公告)号：JP2003263107A

    公开(公告)日：2003-09-19

    申请号：JP2003035500

    申请日：2003-02-13

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ETZEL MARK H ,  FRANK ROBERT JOHN ,  HEER DANIEL NELSON ,  MCNELIS ROBERT JOHN ,  MIZIKOVSKY SEMYON B ,  RANCE ROBERT JOHN ,  SHIPP R DALE

    IPC: G09C1/00 ,  H04L9/06 ,  H04L9/28 ,  H04Q7/32 ,  H04Q7/38

    Abstract: PROBLEM TO BE SOLVED: To achieve an enhanced CMEA encryption system suitable for use in wireless telephony. SOLUTION: A plaintext message is introduced into the system and subjected to a first iteration of a CMEA process, using a fist 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 transformation 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 steps used for encryption, replacing the input and output transformations by inverse output and inverse input transformations, respectively, as appropriate. COPYRIGHT: (C)2003,JPO

    6.
    发明专利
    未知

    公开(公告)号：BR9806074A

    公开(公告)日：2000-10-31

    申请号：BR9806074

    申请日：1998-07-22

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ETZEL MARK H ,  FRANK ROBERT JOHN ,  HERR DANIEL NELSON ,  MCNELIS ROBERT JOHN ,  MIZIKOVKY SEMYON B ,  RACE ROBERT JOHN ,  SHIPP R DALE

    IPC: G09C1/00 ,  H04K1/06 ,  H04L9/06 ,  H04L29/06 ,  H04W12/00 ,  H04W12/02 ,  H04Q7/38

    Abstract: Methods and apparatus for enhanced CMEA, or ECMEA, processing. A forward ECMEA and a reverse ECMEA process are provided. The forward ECMEA process decrypts text encrypted by the reverse ECMEA process and the reverse ECMEA process decrypts text encrypted by the forward ECMEA process. The forward ECMEA process employs a first transformation, an iteration of the CMEA process, and a second transformation. The reverse ECMEA process employs a first inverse transformation, an iteration of the CMEA process, and a second inverse transformation. The transformations and inverse transformations, and the iterations of the CMEA process, employ secret offsets to improve security. The transformations and the iteration of the CMEA process also employ an enhanced tbox function using an involuntary lookup table.

    7.
    发明专利
    未知

    公开(公告)号：BR9804845A

    公开(公告)日：1999-08-24

    申请号：BR9804845

    申请日：1998-04-14

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ETZEL MARK H ,  FRANK ROBERT JOHN ,  HEER DANIEL NELSON ,  MCNELIS ROBERT JOSEPH ,  MIZIKOVKY SEMYON B ,  RANCE ROBERT JOHN

    IPC: H04L9/00 ,  H04L9/06

    Abstract: 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.

    9.
    发明专利
    未知

    公开(公告)号：BR9806124A

    公开(公告)日：1999-08-31

    申请号：BR9806124

    申请日：1998-07-29

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： ETZEL MARK H ,  FRANK ROBERT JOHN ,  HEER DANIEL NELSON ,  MCNELIS ROBERT JOHN ,  MIZIKOVSKY SEMYON B ,  FRANCE ROBERT JOHN ,  SHIPP R DALE

    IPC: G09C1/00 ,  H04L9/06 ,  H04L9/10 ,  H04L9/12 ,  H04L29/06 ,  H04W12/00 ,  H04W12/02

    Abstract: Methods and apparatus for enhanced CMEA, or ECMEA, processing. A forward ECMEA and a reverse ECMEA process are provided. The forward ECMEA process decrypts text encrypted by the reverse ECMEA process and the reverse ECMEA process decrypts text encrypted by the forward ECMEA process. The forward ECMEA process employs a transformation, an iteration of the CMEA process, and an inverse transformation. The reverse ECMEA process employs a reverse transformation, an iteration of the CMEA process, and a reverse inverse transformation. The transformations and inverse transformations, and the iteration of the CMEA process, employ secret offsets to improve security. The transformations and the iteration of the CMEA process also employ an enhanced tbox function using an involutary lookup table.

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