Tagged Chameleon Hash from Lattice and Application to Redactable Blockchain
Chameleon hash (CH) is a trapdoor hash function. Generally it is hard to find collisions, but with the help of...
Global Security News
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An update on Keccak performance on ARMv7-M
This note provides an update on Keccak performance on the ARMv7-M processors. Starting from the XKCP implementation, we have applied...
Classical and Quantum Meet-in-the-Middle Nostradamus Attacks on AES-like Hashing
At EUROCRYPT 2006, Kelsey and Kohno proposed the so-called chosen target forced-prefix (CTFP) preimage attack, where for any challenge prefix...
Revisiting Key Decomposition Techniques for FHE: Simpler, Faster and More Generic
Ring-LWE based homomorphic encryption computations in large depth use a combination of two techniques: 1) decomposition of big numbers into...
Towards compressed permutation oracles
Compressed oracles (Zhandry, Crypto 2019) are a powerful technique to reason about quantum random oracles, enabling a sort of lazy...
Brakedown’s expander code
This write-up summarizes the sampling analysis of the expander code from Brakedown . We elaborate their convexity argument for general...
Owl: An Augmented Password-Authenticated Key Exchange Scheme
We present Owl, an augmented password-authenticated key exchange (PAKE) protocol that is both efficient and supported by security proofs. Owl...
LFHE: Fully Homomorphic Encryption with Bootstrapping Key Size Less than a Megabyte
Fully Homomorphic Encryption (FHE) enables computations to be performed on encrypted data, so one can outsource computations of confidential information...
Lattice-based Commit-Transferrable Signatures and Applications to Anonymous Credentials
Anonymous Credentials are an important tool to protect user's privacy for proving possession of certain credentials. Although various efficient constructions...
Threshold ECDSA in Three Rounds
We present a three-round protocol for threshold ECDSA signing with malicious security against a dishonest majority, which information-theoretically UC-realizes a...