Patent · US Active

Key ladder apparatus and method

US9735956B2 · kind B2 · utility

0Cited by

9References

17Claims

0Family size

Assignee

Cisco Technology, Inc. · US

Inventors

Yaron Sella · Jerusalem, IL
Michal Devir · Jerusalem, IL
Harel Cain · Jerusalem, IL
Perry Smith · Stanton, CA

Key dates

Filing date	Jul 27, 2015
Grant date	Aug 15, 2017
Priority date	—
Expiry date	Feb 17, 2036

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/60
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

In one embodiment a method, apparatus and system for is described for receiving a first input including a first decryption key and a second input including an encrypted second decryption key at a cryptographic decryption apparatus, the encrypted second decryption key to be decrypted by the cryptographic apparatus according to the first decryption key, storing a value of a key ladder length in a first register by a cryptographic processor, and using the stored value as a loop index by the cryptographic processor for a number of iterations of the cryptographic decryption apparatus executed as a loop, wherein at one stage in the loop execution of the cryptographic decryption apparatus, the second input includes the key ladder length, wherein the loop operation of the cryptographic decryption apparatus operates for a number of iterations equal to an initial value of the loop index. Related methods, apparatuses and systems are also described.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.