BART PRENEEL PHD THESIS

Obfuscation for Cryptographic Purposes. Positive Results and Techniques for Obfuscation. A security notion is a formal description of the security of a cryptographic scheme. Ran Canetti and Mayank Varia. Wyseur, and Bart Preneel: On Obfuscating Point Functions. Indeed, it does not suffice to only protect an application against extraction of embedded secret keys.

Nevertheless, this result does not exclude the existence of secure code obfuscators: 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. Obfuscation for Cryptographic Purposes. Resources Slides March — slides PhD defense.

Indeed, it does not suffice to only protect an application against extraction of embedded secret keys.

Bart Preneel

Jan 13, version: Similar theoretic approaches have been conceived for white-box cryptography in [Sax09]. Wee [Wee05] presented a provably secure obfuscator for a preheel function, which can be exploited in practice to construct authentication functionalities.

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Shafi Goldwasser and Yael Tauman Kalai. 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.

Theory White-box cryptography is often linked with code obfuscation, since both aim to protect software implementations. For example, a scheme is defined CPA-secure if an attacker cannot compute the plaintext from a given ciphertext, or KR-secure when the secret key cannot be recovered.

Positive Results and Techniques for Obfuscation.

White-box cryptography

White-box implementations and prenwel results A selection of the state of the art: Chand Gupta, and G. ITCC 1pages On the Impossibility of Obfuscation with Auxiliary Input. 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.

Obfuscation for Cryptographic Purposes.

bart preneel phd thesis

Wyseur, and Bart Preneel: Attacking an obfuscated cipher by injecting faults. Theoretic research on code obfuscation gained momentum with the seminal paper of Barak et al.

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On Obfuscating Point Functions.

Both have received similar scepticism on its feasibility and lack of theoretic foundations. It makes sense to define white-box cryptography accordingly since it reflects more reality. Ran Canetti and Mayank Varia. Research Academic research in white-box cryptography can be categorized into three activities.

bart preneel phd thesis

Resources Slides March — slides PhD defense. On the Im possibility of Obfuscating Programs. A security notion is a formal description of the security of a cryptographic scheme. Nevertheless, this result does not exclude the existence of secure code obfuscators: