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Enhancements Are Blackbox Non-Trivial: Impossibility of Enhanced Trapdoor Permutations from Standard Trapdoor Permutations
Black-box separations Enhanced Trapdoor Permutations Trapdoor Permutations
2018/11/9
Trapdoor permutations (TDP) are a fundamental primitive in cryptography. Over the years, several variants of this notion have emerged as a result of various applications. However, it is not clear whet...
Cube Attacks on Non-Blackbox Polynomials Based on Division Property
Cube attack Stream cipher Division property
2017/4/11
The cube attack is one of powerful cryptanalytic techniques and is especially powerful against stream ciphers. Since we need to analyze the complicated structure of a stream cipher in the cube attack,...
Toward Fine-Grained Blackbox Separations Between Semantic and Circular-Security Notions
Black-box separations circular security
2017/2/21
We address the problems of whether t-circular-secure encryption can be based on (t-1)-circular-secure encryption or on semantic (CPA) security, if t = 1. While for t = 1 a folklore construction, based...
Traceable CP-ABE on Prime Order Groups: Fully Secure and Fully Collusion-resistant Blackbox Traceable
Traceable Ciphertext-policy Attribute Based Encryption Prime Order Groups
2015/12/23
In Ciphertext-Policy Attribute-Based Encryption (CP-ABE), access policies associated with
the ciphertexts are generally role-based and the attributes satisfying the policies are generally shared by
...