Splitting s-boxes in white-box implementations to prevent attacks

Abstract

A method of performing a keyed cryptographic operation mapping an input message to an output message, wherein the input message comprises m input data and the output message comprises m output data and wherein the cryptographic operation includes at least one round and the cryptographic operation specifies a substitution box for mapping input data into output data, including: transforming each of the m input data into n output data using n split substitution boxes, wherein the n split substitution boxes sum to the specified substitution box; and mixing and combining the mxn output data.

Description

technical field [0001] Various example embodiments disclosed herein relate generally to protecting white-box cryptography components from attacks. Background technique [0002] The Internet provides users with the convenience and ubiquity of accessing digital content. Since the Internet is a powerful distribution channel, many user devices strive to directly access the Internet. User equipment may include personal computers, laptop computers, set-top boxes, Internet-enabled media players, mobile phones, smartphones, tablets, mobile hotspots, or any other device capable of accessing the Internet. The use of the Internet as a distribution medium for legitimate content raises pressing questions about protecting the interests of content providers. An increasing number of user devices operate with processors loaded with suitable software for rendering (playing back) digital content such as audio and / or video. Control over playback software is a way of imposing the interests of...

AI Technical Summary

Problems solved by technology

The idea of ​​this technique is to make it more difficult to extract information only by code inspection

Therefore, it is more difficult to find, for example, the code that handles access and admission control to said secure application, and to change it

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