BART PRENEEL PHD THESIS

A security notion is a formal description of the security of a cryptographic scheme. ITCC 1 , pages On the Im possibility of Obfuscating Programs. Jan 13, version: Resources Slides March — slides PhD defense.

Similar theoretic approaches have been conceived for white-box cryptography in [Sax09]. Indeed, it does not suffice to only protect an application against extraction of embedded secret keys. On the Impossibility of Obfuscation with Auxiliary Input. On Obfuscating Point Functions. Theory White-box cryptography is often linked with code obfuscation, since both aim to protect software implementations. On the Im possibility of Obfuscating Programs. ITCC 1 , pages

Similar theoretic approaches have been conceived for white-box cryptography in [Sax09].

bart preneel phd thesis

For example, to create the equivalent of a smart-card-based AES encryption function in software, it does not suffice that the white-box implementation resists extraction of its embedded key, but it must also be hard to invert. Wee [Wee05] presented a provably secure obfuscator for a point function, which can be exploited in practice to construct authentication functionalities. Theory White-box cryptography is often linked with code obfuscation, since both aim to protect software implementations.

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It makes sense to define white-box cryptography accordingly since it reflects more reality.

bart preneel phd thesis

Research Academic research in white-box cryptography can be categorized into three activities. For example, a scheme is defined CPA-secure if an attacker thrsis compute the plaintext from a given ciphertext, or KR-secure when the secret key cannot be recovered.

Bart Preneel

Theoretic research on code obfuscation gained momentum with the seminal paper of Barak et al. ITCC 1pages Indeed, it does not suffice to only protect an application against extraction of embedded secret keys.

Ran Canetti and Mayank Varia. White-box implementations and cryptanalysis results A selection of the state of the art: Chand Gupta, and G.

White-box cryptography

Positive Results and Techniques for Obfuscation. Obfuscation for Cryptographic Purposes.

Both have received similar scepticism on its feasibility and lack of theoretic foundations. The main difference between code obfuscation and white-box cryptography is that the security of the latter needs to be validated with respect to security notions.

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bart preneel phd thesis

Jan 13, version: Shafi Goldwasser and Yael Tauman Kalai. A security notion is a formal description of the security of a cryptographic scheme.

On the Im possibility of Obfuscating Programs. Resources Slides March — slides PhD defense. On the Impossibility of Obfuscation with Auxiliary Input.

Bart Preneel | SBA Research

Nevertheless, this result does not exclude the existence of secure code obfuscators: Attacking an obfuscated cipher by injecting faults. On Obfuscating Point Functions. Wyseur, and Bart Preneel: