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    CRYPTOGRAPHIC SYSTEM
    2.
    发明专利
    CRYPTOGRAPHIC SYSTEM 未知

    公开(公告)号：AU4790572A

    公开(公告)日：1974-04-26

    申请号：AU4790572

    申请日：1972-10-18

    Applicant: IBM

    Inventor： SMITH JOHN LYNN

    IPC: G06F12/14 ,  G06F21/24 ,  H04L9/06 ,  G09C1/00 ,  G09C1/14

    Abstract: This is a cryptographic system for enciphering a block of binary data under the control of a subscriber cipher key consisting of a preassigned combination of binary symbols. The block of data is processed on a segmented basis with each segment of data being serially transformed in accordance with control signals determined from the binary values of key segments. The system is utilized within a data processing environment to provide complete privacy of data that is stored, or transmitted within a computer network.

    4.
    发明专利
    未知

    公开(公告)号：DE2252670A1

    公开(公告)日：1973-05-17

    申请号：DE2252670

    申请日：1972-10-27

    Applicant: IBM

    Inventor： SMITH JOHN LYNN

    IPC: G06F12/14 ,  G06F21/24 ,  H04L9/06 ,  H04L9/02

    Abstract: This is a cryptographic system for enciphering a block of binary data under the control of a subscriber cipher key consisting of a preassigned combination of binary symbols. The block of data is processed on a segmented basis with each segment of data being serially transformed in accordance with control signals determined from the binary values of key segments. The system is utilized within a data processing environment to provide complete privacy of data that is stored, or transmitted within a computer network.

    DATA PROCESSING TERMINAL
    6.
    发明专利
    DATA PROCESSING TERMINAL 未知

    公开(公告)号：DE2861422D1

    公开(公告)日：1982-01-28

    申请号：DE2861422

    申请日：1978-12-05

    Applicant: IBM

    Inventor： EHRSAM WILLIAM FRIEDRICH ,  ELANDER ROBERT CARL ,  MATYAS STEPHEN MICHAEL ,  MEYER CARL HEINZ WILHELM ,  POWERS ROBERT LOWELL ,  PRENTICE PAUL NORMAN ,  SMITH JOHN LYNN ,  TUCHMAN WALTER LEONARD

    IPC: G06F12/00 ,  G09C1/00 ,  H04L9/06 ,  H04L9/08 ,  H04L9/14 ,  H04L9/18 ,  H04L9/02

    Abstract: The invention concerns a data processing terminal. … In an embodiment of the invention a data processing terminal coupled via a communication line to a remote host system includes data security device 11 which includes storage means 13 for storing a master cipher key, cryptographic apparatus 12 for performing cryptographic operations, and control means 14 for controlling the writing of a master cipher key into the storage means 13, controlling the transfer of the master cipher key to the cryptographic apparatus 12 and controlling the cryptographic apparatus to perform cryptographic operations. When a new master cipher key is written into the storage means 13, the old master cipher key is automatically overwritten with an arbitrary value, after which the new master key may be written into the storage means. The cryptographic apparatus 23 of the data security device 11 includes data storage means BR17 and DR22, a working key storage means 20, and cipher means 25 for performing a cipher function on data stored in the cryptographic apparatus storage means under control of a working cipher key stored in the storage means 20, the resulting ciphered data being stored in the cryptographic apparatus storage means. A load cipher key direct function can be performed whereby a working cipher key may be loaded directly into the working key storage means 20 for use as a working cipher key in performing a cipher function. A decipher key function also can be performed whereby the master cipher key from 13 is transferred to the working key storage means 20 as a working cipher key after which an operational key enciphered under the master cipher key (received from the remote host system) is transferred to the cryptographic apparatus storage means and the control means causes the enciphered operational key to be deciphered to obtain the operational key in clear form as a working cipher key for subsequent encipher/decipher data functions by the cipher means 25.

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