Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1993-08-25
1995-08-08
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 25, 380 44, 34082507, 370 60, H04K 100
Patent
active
054406331
ABSTRACT:
A network management frame contains a clear text (unencrypted) management command field and a security field. The management frame is sent to a data communications network by an authorized managing entity (manager). The management frame is addressed to a managing agent (agent). The security field includes two sub fields. The first sub field is a clear text time stamp. The second sub field includes this same time stamp value concatenated with a checksum that is calculated by the manager for the specific clear text management command contained within the management frame. The concatenated value is then encrypted under a secret cryptographic key that is shared by the manager and the agent. The agent receives the management frame, calculates a checksum of the clear text management command, and appends this checksum to the clear text time stamp as contained in the received management frame. This value is then encrypted using the shared cryptographic code. If the result matches the second sub field of the received management command, integrity of the received management command is assured. Next, the clear text value of time stamp contained within the received management command is checked against a common clock within the agent. If the value of this time stamp falls within an predetermined time window, the authenticity of the received management command has been verified.
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Article Entitled "Secure Communication Using Remote Procedure Calls" by Birrell, ACM Transactions on Computer Systems, vol. 3, No. 1, Feb. 1985, pp. 1-14.
Augustine Kurt E.
Neeley, Sr. James Edward
Strole Norman Clark
Cain David C.
Cockburn Joscelyn G.
International Business Machines - Corporation
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