James L. Massey Memorial Collection

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Description

This collection is a tribute to the life and work of James Lee Massey, an information theorist and cryptographer. Massey earned his B.S. in Electrical Engineering from the University in Notre Dame in 1956. After three years of service in the military, he pursued a PhD at MIT. Massey returned to Notre Dame as a professor, teaching from 1962-1977, where he earned recognition as both a proflic engineer and a favored professor. From 1980 until his retirement in 1998, Massey was a faculty member at ETH Zurich. He passed away in 2013 after a battle with cancer. His accolades include the Claude E. Shannon Award (1988), the IEEE Alexander Graham Bell Medal (1992), and the Marconi Prize (1999).

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James L. Massey

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    Patent

    Device for the conversion of a digital block and use of same 
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    Inventor(s):
    James L. Massey, Xuejia Lai
    Patent Number:
    US 5214703
    Description:

    The device (12) comprises nine encryption stages (61.1, 61.2, 69), the first eight of which are constructed identically. It further comprises a key subblock generation unit (63), an input unit (21), and an output unit (79). It serves for the block-by-block encryption of a plaintext (X) proceeding from a message source (11) into a ciphertext (Y) to be delivered on a transmission line (13), wherein a secret key block (Z) is inputted beforehand via a secure channel 17. The encryption is effected…

    Date Issued:
    1993-05-25
    Record Visibility:
    Public
    Title
    Device for the conversion of a digital block and use of same 
    Description
    The device (12) comprises nine encryption stages (61.1, 61.2, 69), the first eight of which are constructed identically. It further comprises a key subblock generation unit (63), an input unit (21), and an output unit (79). It serves for the block-by-block encryption of a plaintext (X) proceeding from a message source (11) into a ciphertext (Y) to be delivered on a transmission line (13), wherein a secret key block (Z) is inputted beforehand via a secure channel 17. The encryption is effected in a step-by-step and parallel manner for four subblocks (X.sub.1 -X.sub.4 ; W.sub.11 -W.sub.14 ; W.sub.21 -W.sub.24 ; W.sub.81 -W.sub.84 ; Y.sub.1 -Y.sub.4). Every encryption stage (61.1, 61.2, 69) comprises four first inputs (25-28; 35-38), six and four second inputs (29, 30, 32, 33, 49, 52; 129, 130, 132, 133), respectively, and four outputs (75-78). A total of fifty-two key subblocks (Z.sub.1 -Z.sub.52) which are formed from the key block (Z) are connected to the second inputs. The device (12) can also serve, without being altered, for the decryption of an incoming ciphertext (Y). Different key subblocks need only be connected to the second inputs for this purpose.
    Creator
    James L. Massey, Xuejia Lai
    Publisher
    United States Patent and Trademark Office
    Language
    English
    Resource Type
    Patent
1 entry found