Tjerand Silde
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tjesi.bsky.social
Tjerand Silde
@tjesi.bsky.social
310 followers 300 following 20 posts
Associate Professor in Cryptology and Research Group Leader at the NTNU Applied Cryptology Lab in Trondheim, Norway.

Homepage: https://tjerandsilde.no

Research group: https://www.ntnu.edu/iik/nacl-lab
Posts Replies Media Videos
Reposted by Tjerand Silde
malb.bsky.social
Social Foundations of Cryptography: Autumn School
London, UK | 15 to 17 September 2026
social-foundations-of-cryptography.gitlab.io/school
We're hosting an Autumn School in London, UK, from 15 to 17 September 2026, to bring together ethnographers and cryptographers to discuss ways in which the two fields can be meaningfully brought into conversation. This is also the premise of our Social Foundations of Cryptography project: to ground cryptography in ethnography. Here, we rely on ethnographic methods, rather than our intuition, to surface security notions that we then formalise and sometimes realise using cryptography. Our intention is to 'flip' the typical relationship between the computer and social sciences, where the latter has traditionally ended up in a service role to the former. Rather, we want to put cryptography at the mercy of ethnography. But how do we do this? How do we as cryptographers interact with and make sense of ethnographic field data? How can we refine, improve or extend this interaction? What obstacles do we face when we make cryptography rely on ethnographic data which is inherently 'messy'? How do we handle that cryptographic notions tend to require some form of generalisation but ethnographic findings can only be particular? How do ethnographers retain the richness of ethnographic field data in conversations with cryptographic work? Indeed, our project has already highlighted some limitations of our approach. It has brought to the fore concrete challenges in 'letting the ethnographic data speak' while still making it speak to cryptography. The Autumn School is an opportunity to explore these questions jointly across ethnography and cryptography, through a series of talks, group discussions and activities. We say a bit more about the programme and registration for the Autumn School here.
January 13, 2026 at 4:30 PM
Reposted by Tjerand Silde
malb.bsky.social
Come work with us!

Lecturer (≅ Assistant Professor/Juniorprofessor/Maître de conférences) in Cryptography at King’s College London

martinralbrecht.wordpress.com/2026/01/05/l...
Lecturer (≅ Assistant Professor/Juniorprofessor/Maître de conférences) in Cryptography at King’s College London 2026
We are looking to recruit a lecturer in cryptography at King’s College London to work with us within the cybersecurity group: I think it’s fair to say we got strong expertise in lattice-based and p…
martinralbrecht.wordpress.com
January 5, 2026 at 12:04 PM
Reposted by Tjerand Silde
hannejakobsen.bsky.social
January 4, 2026 at 11:53 AM
tjesi.bsky.social
www.jobbnorge.no/en/available...
Professor/Associate Professor in Cybersecurity (287959) | NTNU - Norwegian University of Science and Technology
Job title: Professor/Associate Professor in Cybersecurity (287959), Employer: NTNU - Norwegian University of Science and Technology, Deadline: Monday, December 1, 2025
www.jobbnorge.no
October 28, 2025 at 7:44 AM
Reposted by Tjerand Silde
matthewdgreen.bsky.social
Germany has agreed to stop ChatControl for now, due to huge amounts of public pressure. Good job! The bad news is that it could come back as soon as December, and the German government has interpreted the feedback as a need to “moderate” the proposal.
October 10, 2025 at 11:36 AM
Reposted by Tjerand Silde
secparam.bsky.social
Discord user IDs getting leaked is the entirely predictable consequence of requiring platforms to do age verification. That data never goes away, it spreads. In this case, into appeals in a breached customer support database. And predictably, it can get worse. www.404media.co/the-discord-...
The Discord Hack is Every User’s Worst Nightmare
A hack impacting Discord’s age verification process shows in stark terms the risk of tech companies collecting users’ ID documents. Now the hackers are posting peoples’ IDs and other sensitive informa...
www.404media.co
October 9, 2025 at 7:59 PM
Reposted by Tjerand Silde
dfaranha.bsky.social
Someone please make me understand how Denmark can be at the same time freaking out about hybrid war with Russia AND pushing for government-mandated spyware as Chat Control.
October 6, 2025 at 3:52 PM
Reposted by Tjerand Silde
rosamundevb.bsky.social
What is chat control? Good video explainer developed by @carmelatroncoso.bsky.social and team at Max Planck Institute for Security and Privacy #chatcontrol www.youtube.com/watch?v=-y2O...
What is Chat Control?
YouTube video by Max Planck Institute for Security and Privacy
www.youtube.com
October 6, 2025 at 3:18 PM
Reposted by Tjerand Silde
signal.org
We are alarmed by reports that Germany is on the verge of a catastrophic about-face, reversing its longstanding and principled opposition to the EU’s Chat Control proposal which, if passed, could spell the end of the right to privacy in Europe. signal.org/blog/pdfs/ge...
signal.org
October 3, 2025 at 4:14 PM
Reposted by Tjerand Silde
eprint.ing.bot
Olingo: Threshold Lattice Signatures with DKG and Identifiable Abort (Kamil Doruk Gur, Patrick Hough, Jonathan Katz, Caroline Sandsbråten, Tjerand Silde) ia.cr/2025/1789
Abstract. We present Olingo, a framework for threshold lattice signatures that is the first to offer all desired properties for real-world implementations of quantum-secure threshold signatures: small keys and signatures, low communication and round complexity, non-interactive online signing, distributed key generation (DKG), and identifiable abort. Our starting point is the framework of Gur, Katz, and Silde (PQCrypto 2024). We change the underlying signature scheme to Raccoon (Katsumata et al., Crypto 2024), remove the trapdoor commitments, and apply numerous improvements and optimizations to achieve all the above properties. We provide detailed proofs of security for our new framework and present concrete parameters and benchmarks. At the 128-bit security level, for up to 1024 parties and supporting 2⁶⁰ signatures, our scheme has 2.6 KB public keys and 9.7 KB signatures; while signing requires communication of 953 KB per party. Using the LaBRADOR proof system (Beullens and Seiler, Crypto 2023), this can be further reduced to 596 KB. An optimistic non-interactive version of our scheme requires only 83 KB communication per party. Image showing part 2 of abstract.
October 3, 2025 at 7:25 AM
Reposted by Tjerand Silde
signal.org
In 2023, Signal was the first mainstream messenger to enable post-quantum cryptography. We’re still ahead of the (elliptical) curve, implementing a new hybrid PQ ratchet ensuring Forward Secrecy & Post-Compromise Security even in a post-quantum world. signal.org/blog/spqr/
Signal Protocol and Post-Quantum Ratchets
We are excited to announce a significant advancement in the security of the Signal Protocol: the introduction of the Sparse Post Quantum Ratchet (SPQR). This new ratchet enhances the Signal Protocol’s...
signal.org
October 2, 2025 at 4:09 PM
Reposted by Tjerand Silde
natanael.bsky.social
Burn it with fire
The EU has never been closer to agreeing on Chat Control – here's how we got here and what’s at stake
The Danish version of Chat Control is thought to have the best chances of becoming law since 2022
www.techradar.com
September 11, 2025 at 8:08 PM
Reposted by Tjerand Silde
hannejakobsen.bsky.social
Ah ja hvorfor satse på personvernvennlige nettsider med riktig informasjon når man heller kan samle persondata via en tjeneste som tar feil iblant FOR FUCKS SAKE STATEN dere -kan- ikke være så cucked www.regjeringen.no/no/aktuelt/o...
Offentleg KI-teneste skal gi nordmenn trygge helseråd på Helsenorge
Regjeringa har tatt det første steget for å etablere ein nasjonal teneste for helserelaterte spørsmål basert på generativ kunstig intelligens (KI). Nyleg ba Helse- og omsorgsdepartementet om ei vurder...
www.regjeringen.no
September 11, 2025 at 4:07 PM
Reposted by Tjerand Silde
andreavbasso.bsky.social
More than 500 researchers have signed an open letter against the dangerous EU proposal on chat control.

The proposal remains ineffective, undoes decades of results in E2E encryption, and threatens the privacy of half a billion citizens.

csa-scientist-open-letter.org/Sep2025
csa-scientist-open-letter.org
September 9, 2025 at 10:40 AM
tjesi.bsky.social
The EU Parliament has published a new proposal for Chat Control to mass-surveil all digital communication in Europe. The proposal is ineffective, weakens secure communication, and violates basic human privacy. This must be stopped immediately. #ChatControl
csa-scientist-open-letter.org/Sep2025
csa-scientist-open-letter.org
September 9, 2025 at 11:11 AM
tjesi.bsky.social
Accepted papers at IACR Asiacrypt 2025 are now available online (not a complete list yet): iacr.org/cryptodb/dat...
Papers from ASIACRYPT 2025
iacr.org
September 8, 2025 at 6:46 AM
Reposted by Tjerand Silde
mmasnick.bsky.social
EU is demanding that every site use age verification technology, while insisting it do things it cannot do, and behave in a manner it cannot behave. This is not policy making. This is wishful thinking, with a side of "we'll just blame the tech companies for not waving their magic wand."
At the same time, a Commission press release said it expects any age assurance method that's used for child protection purposes to be accurate, reliable, robust, non-intrusive and non-discriminatory.
July 14, 2025 at 5:06 PM
Reposted by Tjerand Silde
mccurley.bsky.social
We've published Volume 2, Issue 2 of IACR Communications in Cryptology. This now brings us over 200 articles published in six issues. cic.iacr.org/i/2/2 It may be time to overhaul the rest of IACR publishing. 🤔
Volume 2, Issue 2
cic.iacr.org
July 7, 2025 at 10:20 PM
Reposted by Tjerand Silde
matthewdgreen.bsky.social
This battle will keep playing out over and over again until they achieve something that their own citizens have made it clear they don’t want. www.techradar.com/vpn/vpn-priv...
The EU wants to decrypt your private data by 2030
The EU Commission unveiled the first step in its security strategy to ensure "lawful and effective" law enforcement access to data
www.techradar.com
July 5, 2025 at 5:39 PM
Reposted by Tjerand Silde
dfaranha.bsky.social
Well, this horrible idea refuses to die so we should refuse to let it pass and start organizing again.

ec.europa.eu/commission/p...
Commission presents Roadmap for effective and lawful access to data for law enforcement
The European Commission presented today a Roadmap setting out the way forward to ensure law enforcement authorities in the EU have effective and lawful access to data.
ec.europa.eu
July 5, 2025 at 5:25 PM
Reposted by Tjerand Silde
sejaques.bsky.social
An out-of-schedule update to my quantum landscape chart: sam-jaques.appspot.com/quantum_land..., prompted by
@craiggidney.bsky.social 's new paper: arxiv.org/abs/2505.15917.

A startling jump (20x) in how easy quantum factoring can be!

Also: much improved web design!
A chart for quantum computers, of number of qubits versus error rate, on a logarithmic scale. Broadly it shows a large gap between current quantum computers in the bottom left, and a curve in the top right of the resources they need to break RSA.
June 19, 2025 at 6:52 PM
Reposted by Tjerand Silde
smartcryptology.bsky.social
Congratulations to the new IACR fellows....

Joan Daemen,
Thomas Johansson,
Anna Lysyanskaya,
Pascal Paillier,
J.R. Rao,
Alon Rosen,
Elaine Shi,
Bo-Yin Yang.

iacr.org/fellows/

#cryptography
IACR Fellows
iacr.org
April 14, 2025 at 6:16 PM
Reposted by Tjerand Silde
astrokatie.com
The problem with most machine-based random number generators is that they’re not TRULY random, so if you need genuine randomness it is sometimes necessary to link your code to an external random process like a physical noise source or the current rate of US tariffs on a given country.
April 9, 2025 at 7:15 PM