Apparatus and method for counter-based communications in...

Details Apparatus and method for counter-based communications in... Apparatus and method for counter-based communications in...

2008-06-10

2011-10-11

Lipman, Jacob (Department: 2434)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

C380S255000

Reexamination Certificate

active

08037296

ABSTRACT:
A method includes wirelessly receiving a message at a receiving node. The method also includes extracting a partial counter value from the message, where the partial counter value represents a subset of bits from a complete counter value of a transmitting node. The method further includes decrypting and authenticating the message based on the partial counter value. Decrypting and authenticating the message could include examining a bitmap to identify a bit value associated with the partial counter value, decrypting and authenticating the message if the identified bit value has a first value, and discarding the message if the identified bit value has a second value. Decrypting and authenticating the message could also include identifying at least one complete counter value at the receiving node based on the partial counter value and attempting to decrypt and authenticate the message using the at least one complete counter value.

REFERENCES:
Hart Communication Protocol, “Network Management Specification”, HCF—SPEC-085, Revision 1.1, May 30, 2008, 92 pages, see esp. 8.1.3.3 & 8.1.3.4.
Mark Luk, et al., “MiniSec: A Secure Sensor Network Communication Architecture”, IPSN'07, Apr. 25-27, 2007, p. 479-488.

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