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. 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. Positive Results and Techniques for Obfuscation. Resources Slides March — slides PhD defense.

Theoretic research on code obfuscation gained momentum with the seminal paper of Barak et al. Similar theoretic approaches have been conceived for white-box cryptography in [Sax09]. Wyseur, and Bart Preneel: 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. A security notion is a formal description of the security of a cryptographic scheme. Ran Canetti and Mayank Varia. Both have received similar scepticism on its feasibility and lack of theoretic foundations.

On the Im possibility of Obfuscating Programs.

A security notion is a formal description of the security of a cryptographic scheme. The main difference between code obfuscation and white-box cryptography is that the security of the latter needs to be thesi with respect to security notions.

Similar theoretic approaches have been conceived for white-box cryptography in [Sax09]. Nevertheless, this result does not exclude the existence of secure code obfuscators: ITCC 1pages Both have received similar scepticism on its feasibility and lack of theoretic foundations.

## Bart Preneel

Positive Results and Techniques preeneel Obfuscation. On Obfuscating Point Functions. White-box implementations and cryptanalysis results A selection of the state of the art: Attacking an obfuscated cipher by injecting faults. Chand Gupta, and G. It makes sense to define white-box cryptography accordingly since it reflects more reality.

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.

On the Impossibility of Obfuscation with Auxiliary Input. Wee [Wee05] presented a provably secure obfuscator for a point function, which can be exploited in practice to construct authentication functionalities.

# White-box cryptography

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

Obfuscation for Cryptographic Purposes. Jan 13, version: Theory White-box cryptography is often linked with code obfuscation, since both aim to protect software implementations.

Shafi Goldwasser and Yael Tauman Kalai. Resources Slides March — slides PhD defense.

Research Academic research in white-box cryptography can be categorized into three activities. Wyseur, and Bart Preneel: