Patent · US Active

Apparatus and method for operating a symmetric cipher engine in cipher-block chaining mode

US8594321B2 · kind B2 · utility

1Cited by

6References

8Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Ulrich Mayer · Weißenhorn, DE
Thomas Koehler · Holzgerlingen, DE
Bernd Nerz · Eppelheim, DE

Key dates

Filing date	Oct 24, 2008
Grant date	Nov 26, 2013
Priority date	—
Expiry date	Sep 16, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/12
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

An apparatus is disclosed for operating a symmetric cipher engine (SCE) in cipher-block chaining (CBC) mode. The apparatus includes a crypto operation hardware including the SCE and an XOR stage, an apparatus for storing a chaining value including a state register of the SCE, an input latch supplying the crypto operation hardware with data, and an output latch. The data may be reordered for decipher operation. Furthermore, a method is disclosed for operating a SCE in CBC mode, wherein the method involves a crypto operation hardware that includes the SCE and an XOR stage supplied with data. The method also may include using a state register of the SCE to apply a chaining value. The method further may comprise reordering data supplied to the crypto operation hardware for decipher operation.

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