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General Linear Group Action on Tensors: A Candidate for Post-Quantum Cryptography
Group actions isomorphism problems signature schemes
2019/6/12
Starting from the one-way group action framework of Brassard and Yung (Crypto '90), we revisit building cryptography based on group actions. Several previous candidates for one-way group actions no lo...
Guards in Action: First-Order SCA Secure Implementations of Ketje without Additional Randomness
Authenticated Encryption KETJE SHA-3
2018/11/19
Recently the CAESAR competition has announced several finalists among the submitted authenticated encryption algorithms, after an open selection process during the last 5 years. Applications using the...
CSIDH: An Efficient Post-Quantum Commutative Group Action
post-quantum cryptography isogeny-based cryptography class group action
2018/5/2
We propose an efficient commutative group action suitable for non-interactive key exchange in a post-quantum setting. Our construction follows the layout of the Couveignes-Rostovtsev-Stolbunov cryptos...
Computing isogenies between Montgomery curves using the action of (0,0)
Velu's formulas Montgomery form 2-isogenies
2017/12/19
A recent paper by Costello and Hisil at Asiacrypt'17 presents efficient formulas for computing isogenies with odd-degree cyclic kernels on Montgomery curves. We provide a constructive proof of a gener...
Side-Channel Analysis Protection and Low-Latency in Action - case study of PRINCE and Midori
Side-Channel Analsysi Masking Threshold Implementation
2016/5/24
During the last years, the industry sector showed particular interest in solutions which allow to encrypt and decrypt data within one clock cycle. Known as low-latency cryptography, such ciphers are d...