Implementing key scheduling for white-box DES implementation

A device and method for performing a keyed cryptographic operation mapping an input message to an output message including a first and a second round, wherein the cryptographic operation includes a key scheduling method that produces round keys based upon the encryption key, including: instructions...

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Bibliographic Details
Main Authors Michiels Wil, Hoogerbrugge Jan
Format Patent
LanguageEnglish
Published 21.03.2017
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
JAMMING OF COMMUNICATION
SECRET COMMUNICATION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:A device and method for performing a keyed cryptographic operation mapping an input message to an output message including a first and a second round, wherein the cryptographic operation includes a key scheduling method that produces round keys based upon the encryption key, including: instructions for receiving a first input by the first round; instructions for receiving a second input by the first round; instructions for outputting the second input as a third input to the second round; instructions for performing a first cryptographic operation on the second input using a first static round key to produce a first cryptographic output; and instructions for combining first input, the first cryptographic output, and a second encoded dynamic round key to produce a fourth input to the second round, wherein the second encoded dynamic round key is produced by inputting an encoded dynamic encryption key into the key scheduling method.
Bibliography:Application Number: US201514705635