Gustavo Banegas
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gustavosbanegas.bsky.social
Gustavo Banegas
@gustavosbanegas.bsky.social
110 followers 87 following 8 posts
Researcher at INRIA. Ph.D. in Cryptography (TU/e). Cryptographer , Surfer 🏄‍♂️, and Geek 🤓, http://www.cryptme.in The opinions here are my own. ;)
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gustavosbanegas.bsky.social
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
gustavosbanegas.bsky.social
No to chat control...
csa-scientist-open-letter.org/Sep2025
csa-scientist-open-letter.org
September 9, 2025 at 6:05 PM
Reposted by Gustavo Banegas
eprint.ing.bot
Compressed verification for post-quantum signatures with long-term public keys (Gustavo Banegas, Anaëlle Le Dévéhat, Benjamin Smith) ia.cr/2025/1576
Abstract. Many signature applications—such as root certificates, secure software updates, and authentication protocols—involve long-lived public keys that are transferred or installed once and then used for many verifications. This key longevity makes post-quantum signature schemes with conservative assumptions (e.g., structure-free lattices) attractive for long-term security. But many such schemes, especially those with short signatures, suffer from extremely large public keys. Even in scenarios where bandwidth is not a major concern, large keys increase storage costs and slow down verification. We address this with a method to replace large public keys in GPV-style signatures with smaller, private verification keys. This significantly reduces verifier storage and runtime while preserving security. Applied to the conservative, short-signature schemes and , our method compresses keys from to and keys from to .
September 5, 2025 at 1:00 AM
gustavosbanegas.bsky.social
Let's throw this here and RUN
March 28, 2025 at 10:27 AM
gustavosbanegas.bsky.social
Yey, it is online. Nice paper that we build to cause a fault in SNOVA. eprint.iacr.org/2024/1883
A Fault Analysis on SNOVA
SNOVA is a post-quantum cryptographic signature scheme known for its efficiency and compact key sizes, making it a second-round candidate in the NIST post-quantum cryptography standardization process....
eprint.iacr.org
November 22, 2024 at 5:50 AM
gustavosbanegas.bsky.social
Hello, that is the first "ski"?
November 21, 2024 at 9:11 AM