Irdeto B.v.

Jonathan Emmett

Clifford Liem

Philip Allan Eisen

Robert Krten

Daniel Elie Murdock

James Muir

The present disclosure provides a description of a computer implemented method and system for protecting a software program from attack during runtime. The system comprises a plurality of software blocks for providing desired functions during execution of a software program and a trusted address server having a table for mapping predetermined source tokens to destination tokens. The trusted address server couples each of the plurality of software blocks for receipt of predetermined source tokens from any one of the plurality of software blocks, while returning a mapped destination token from the predetermined destination tokens to said any one of the plurality of software blocks in dependence upon the table for mapping predetermined source tokens to destination tokens.

Method and apparatus for program flow in software operation

A method of protecting the execution of a cryptographic hash function, such as SHA-256, in a computing environment where inputs, outputs and intermediate values can be observed. The method consists of encoding input messages so that hash function inputs are placed in a transformed domain, and then applying a transformed cryptographic hash function to produce an encoded output digest; the transformed cryptographic hash function implements the cryptographic hash function in the transformed domain.

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Ottawa, Canada

Jonathan Emmett