And Hell
andhell.de
And Hell
@andhell.de
Reposted by And Hell
Dummy or not dummy? That’s the question — and our answer is no dummy at all! 🧠🔒

Our paper “Hardened CTIDH: Dummy-Free and Deterministic CTIDH” has been accepted at INDOCRYPT 2025
Preprint here: eprint.iacr.org/2025/1645/
Hardened CTIDH: Dummy-Free and Deterministic CTIDH
Isogeny-based cryptography has emerged as a promising post-quantum alternative, with CSIDH and its constant-time variants \ctidh and \dctidh offering efficient group-action protocols. However, \ctid...
eprint.iacr.org
October 13, 2025 at 9:08 AM
Reposted by And Hell
Hardened CTIDH: Dummy-Free and Deterministic CTIDH (Gustavo Banegas, Andreas Hellenbrand, Matheus Saldanha) ia.cr/2025/1645
September 12, 2025 at 2:37 PM
Reposted by And Hell
The EU wants to spend your money to assemble a giant mass surveillance machine with little effect on harm against children. Chat Control is not effective, weakens security for all and does not respect privacy. Contact your EU representatives and let them know.

csa-scientist-open-letter.org/Sep2025
csa-scientist-open-letter.org
September 9, 2025 at 11:24 AM
Reposted by And Hell
Finally, a state-of-the-art version of CTIDH! That is, deterministic and a prime of 2048 bits. We introduce a new batching strategy we call "wombats", making dCTIDH five times faster than deterministic CSIDH. Surprisingly, it even beats "non-deterministic" CTIDH.

See eprint.iacr.org/2025/107
dCTIDH: Fast & Deterministic CTIDH
This paper presents dCTIDH, a CSIDH implementation that combines two recent developments into a novel state-of-the-art deterministic implementation. We combine the approach of deterministic variants o...
eprint.iacr.org
January 23, 2025 at 9:24 PM