BART PRENEEL THESIS

Positive Results and Techniques for Obfuscation. Obfuscation for Cryptographic Purposes. 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. Wyseur, and Bart Preneel: White-box implementations and cryptanalysis results A selection of the state of the art: Theory White-box cryptography is often linked with code obfuscation, since both aim to protect software implementations.

Indeed, it does not suffice to only protect an application against extraction of embedded secret keys. Ran Canetti and Mayank Varia. Similar theoretic approaches have been conceived for white-box cryptography in [Sax09]. Nevertheless, this result does not exclude the existence of secure code obfuscators: It makes sense to define white-box cryptography accordingly since it reflects more reality. 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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Ran Canetti and Mayank Varia. Similar theoretic approaches have been conceived for white-box cryptography in [Sax09]. Nevertheless, this result does not exclude the existence of secure code obfuscators: Obfuscation for Prenfel Purposes. Chand Gupta, and G.

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It makes sense to define white-box cryptography accordingly since it reflects more reality. Research Academic research in white-box cryptography can be categorized into three activities. On the Im possibility of Obfuscating Programs.

Theory White-box cryptography is often linked with code obfuscation, since both aim to protect software implementations. ITCC 1pages Wyseur, and Bart Preneel: 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.

White-box cryptography

Attacking an obfuscated cipher by injecting faults. Resources Slides March — slides PhD defense. Shafi Goldwasser and Yael Tauman Kalai.

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.

For example, to create the equivalent of a smart-card-based AES encryption function in barrt, it does not suffice that the white-box implementation resists extraction of its embedded key, but it must also be hard to invert. White-box implementations and cryptanalysis results A selection of the state of the art: On Thesie Point Functions.

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bart preneel thesis

Indeed, it does not suffice to only protect an application against extraction of embedded secret keys. Jan 13, version: On the Impossibility of Obfuscation with Auxiliary Input. Theoretic research on code obfuscation gained momentum with the seminal paper of Barak et al.

Wee [Wee05] presented a provably secure obfuscator for a point function, which can be exploited in practice to construct authentication functionalities.

A security notion is a formal description of the security of a cryptographic scheme.

bart preneel thesis

Positive Results and Techniques for Obfuscation.