05142578 is referenced by 163 patents and cites 15 patents.

The patent describes a method and apparatus for securely distributing an initial Data Encryption Algorithm (DEA) key-encrypting key by encrypting a key record (consisting of the key-encrypting key and control information associated with that key-encrypting key) using a public key algorithm and a public key belonging to the intended recipient of the key record. The patent further describes a method and apparatus for securely recovering the distributed key-encrypting key by the recipient by decrypting the received key record using the same public key algorithm and private key associated with the public key and re-encrypting the key-encrypting key under a key formed by arithmetically combining the recipient's master key with a control vector contained in the control information of the received key record. Thus the type and usage attributes assigned by the originator of the key-encrypting key in the form of a control vector are cryptographically coupled to the key-encrypting key such that the recipient may only use the received key-encrypting key in a manner defined by the key originator.

The patent further describes a method and apparatus to improve the integrity of the key distribution process by applying a digital signature to the key record and by including identifying information (i.e., an originator identifier) in the control information of the key record. The integrity of the distribution process is enhanced by verifying the digital signature and originator identifier at the recipient node.

Title
Hybrid public key algorithm/data encryption algorithm key distribution method based on control vectors
Application Number
7/748407
Publication Number
5142578
Application Date
August 22, 1991
Publication Date
August 25, 1992
Inventor
William S Rohland
Charlotte
NC, US
William C Martin
Concord
NC, US
John D Wilkins
Somerville
VA, US
Rostislaw Prymak
Dumfries
VA, US
An V Le
Manassas
VA, US
Donald B Johnson
Manassas
VA, US
Stephen M Matyas
Manassas
VA, US
Agent
John E Hoel
Assignee
International Business Machines Corporation
NY, US
IPC
H04L 9/30
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