Aravind (Sri AravindaKrishnan Thyagarajan)
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aravind16coiner.bsky.social
Aravind (Sri AravindaKrishnan Thyagarajan)
@aravind16coiner.bsky.social
250 followers 93 following 47 posts
Lecturer @sydney.edu.au @sydneycompsci.bsky.social

Previously Post Doc at @NttResearch, CMU @CyLab. PhD from @UniFAU. Cryptography, Fairness, Blockchain, Cryptocurrency

Webpage: http://aravinda-thyagarajan.com
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Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
This December, the Faculty of Engineering at #USyd is delighted to welcome Prof. Shafi Goldwasser, who will deliver a Dean's Lecture on "Constructing Trust: A Cryptographic Tool Kit!"

🕒 Wednesday, Dec 10
3:00—5:00pm
(includes lecture and networking)

⏰ Register by Dec 5 (link and location below)
Dean's Lecture Series with Professor Shafi Goldwasser: Wednesday 10 December 2025 at the University of Sydney
November 17, 2025 at 8:00 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
socrates1024.bsky.social
Financial Cryptography

Final call for papers FC26
fc26.ifca.ai/cfp.html

Submission deadline: 20 September 2025

Conference:
2–6 March 2026
St. Kitts Marriott Resort
FC'26 : Call for Papers
Financial Cryptography and Data Security is a major international forum for research, advanced development, education, exploration, and debate regarding information assurance, with a specific focus on...
fc26.ifca.ai
September 14, 2025 at 12:03 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
July 27, 2025 at 10:02 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
We had academic speakers like @ccanonne.github.io @vellosoraptor.bsky.social @jlizier.bsky.social , Anusha Withana and Zhiyong Wang
July 27, 2025 at 10:02 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
Our School has just organised the annual #ResearchShowcase, where our academics, PhD, and Master's (by research) students presented their research with an interdisciplinary focus. 🎉🎉🎉
July 27, 2025 at 10:02 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
🎉 Clément and Yun's paper "Local Computation Algorithms for Knapsack: impossibility results, and how to avoid them" is accepted at RANDOM 2025! Paper: arxiv.org/abs/2504.01543

🔗More about RANDOM: randomconference.com
👤
@ccanonne.github.io

#algorithms #sublinearalgorithms #distributedalgorithms
Local Computation Algorithms for Knapsack: impossibility results, and how to avoid them
Local Computation Algorithms (LCA), as introduced by Rubinfeld, Tamir, Vardi, and Xie (2011), are a type of ultra-efficient algorithms which, given access to a (large) input for a given computational ...
arxiv.org
July 3, 2025 at 2:37 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydmathinst.bsky.social
Applications are now open for our International Visitor Program, open to #mathematicians to visit Aus 🐨 between July '26-'June 27, or March '26-June -27 (Aus/NZ citizens)
📅 Apply by Aug 1, info:
mathematical-research-institute.sydney.edu.au/internationa...
Please share with your networks 🔁 #MathSky
International Visitor Program - Sydney Mathematical Research Institute
IVP August 2023 applications are due 8 August 2023, for July 2024–June 2025 visits (general applicants) & March 2024–June 2025 for Australian citizens/PR & NZ citizens.
mathematical-research-institute.sydney.edu.au
July 3, 2025 at 12:06 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
Details, guidelines, and eligibility requirements:

🔗 Women in Engineering Scholarship:
www.sydney.edu.au/scholarships...

🔗 Women in Engineering Excellence:
www.sydney.edu.au/scholarships...

Please spread the word! #WomenInEngineering #WomenInSTEM #WomenInComputerScience #USyd
Faculty of Engineering Women in Engineering Scholarship
A $10,000 scholarship to support female undergraduate domestic students in the Faculty of Engineering.
www.sydney.edu.au
June 24, 2025 at 11:42 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
📢 The Faculty of Engineering at #USyd is offering over $1.5M in scholarships to support female domestic undergraduate students starting in 2026.

Applications will open on July 1, close on Sep 30. For more details, see links in reply below. #WomenInSTEM #WomenInEngineering #WomenInCS @sydney.edu.au
June 24, 2025 at 11:37 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
eprint.ing.bot
Fairness in the Wild: Secure Atomic Swap with External Incentives (Hao Chung, Elisaweta Masserova, Elaine Shi, Sri AravindaKrishnan Thyagarajan) ia.cr/2025/1086
Abstract. Atomic swaps enable asset exchanges across blockchains without relying on trusted intermediaries, and are a key component of decentralized finance (DeFi) ecosystems. Recently, Chung, Masserova, Shi, and Thyagarajan introduced Rapidash (Financial Cryptography 2025), an atomic swap protocol that remains incentive compatible under user-miner collusion, by ensuring that the honest strategy forms a coalition-resistant Nash equilibrium. However, their model assumes a closed system where players act solely based on internal protocol incentives. In practice, participants may be influenced by external incentives such as off-chain rewards or adversarial bribes, which can undermine such equilibrium guarantees. In this work, we introduce a new game-theoretic notion, bounded maximin fairness, which ensures that honest participants remain protected against rational adversaries with arbitrary but bounded external incentives. We construct an atomic swap protocol that satisfies this notion, while preserving the equilibrium properties of prior work in the absence of external influence. As we show, our protocol is easy to implement and can be instantiated even in Bitcoin’s limited scripting language. Image showing part 2 of abstract.
June 10, 2025 at 2:53 PM
aravind16coiner.bsky.social
Crypto Valley Conference 2025 is all set to happen tomorrow June 6 in Rotkreuz, Switzerland. The program can be found here: cryptovalleyconference.com/docs/agenda_cv…
My co-chair ChenDa has led from the front and organizing the event in person#CVCBTB#Bitcoini#IEEEEE
https://cryptovalleyconference.com/docs/agenda_cv…
June 5, 2025 at 12:32 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
🚨🚨📣 We now have a Sydney Blockchain Centre led by @jiangshanyu.github.io . It consists of experts from our School on various topics ranging from #distributed #computing, #consensus, #formalverification, to #security and #cryptography. Check out: usyd-desci.github.io/index.html
#Blockchain #USyd
Sydney Blockchain Centre
usyd-desci.github.io
May 30, 2025 at 3:00 AM
aravind16coiner.bsky.social
www.linkedin.com/posts/mfesgi...

PhD and postdoc opportunities in post quantum cryptography at Monash University. Esgin is an amazing researcher. Do apply if you are interested.
supervision | Muhammed Esgin
🌟 𝐏𝐡𝐃 and 𝐏𝐨𝐬𝐭𝐃𝐨𝐜 Opportunities in Post-Quantum Cryptography 🌟 The cybersecurity group at Monash Information Technology has openings for PhD and PostDoc positions, fully funded by an Australian Rese...
www.linkedin.com
May 29, 2025 at 4:58 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydney.edu.au
A first-of-its-kind research and development company has been launched by the @sydney.edu.au quantum technology team that worked closely with Microsoft Quantum for the best part of a decade.

Emergence Quantum is delivering quantum technology’s “missing link”.
Emergence Quantum: a commercial 'special ops' team for research and development
Professor David Reilly and Dr Thomas Ohki have launched Emergence Quantum, a spinout from the University of Sydney, building on their work at Microsoft Quantum, they are delivering a new type of comme...
go.sydney.edu.au
May 27, 2025 at 11:31 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
eprint.ing.bot
InstaRand: Instantly Available and Instantly Verifiable On-chain Randomness (Jacob Gorman, Lucjan Hanzlik, Aniket Kate, Pratyay Mukherjee, Pratik Sarkar, Sri AravindaKrishnan Thyagarajan) ia.cr/2025/896
Abstract. Web3 applications, such as on-chain gaming, require unbiased and publicly verifiable randomness that can be obtained quickly and cost-effectively whenever needed. Existing services, such as those based on Verifiable Random Functions (VRF), incur network delays and high fees due to their highly interactive nature. FlexiRand [CCS 2023] addressed these problems by hiding the output of the VRF and using that as a seed to derive many randomnesses locally. These randomnesses are instantly available for usage. However, these randomnesses can not be verified independently (or instantly) without disclosing the seed, leaving scope for malicious actors to cheat. To solve this problem, we introduce a new notion, called instantly-verifiable VRF (iVRF), which enables the generation of many randomnesses from one VRF output seed, such that each of them is verifiable independently - this enables the first solution to cost − effectively generate randomnesses, such that they are instantly available and also independently/instantly verifiable. To instantiate we propose a generic construction called InstaRand - it combines any (possibly distributed) VRF at the server’s end with another VRF at the client’s end to construct an iVRF. Our specific instantiation uses the BLS-based GLOW-DVRF [Euro S&P 2021] at the server’s end and the DDH-based VRF of Goldberg et al. [RFC 2023] at the client’s end. We use the universal composability framework to analyze the security. Moreover, due to its generality, InstaRand can be instantiated with any post-quantum secure VRF to yield a post-quantum secure iVRF. Our experiments demonstrate that our instantiation of InstaRand is highly practical. The client incurs a one − time cost to generate the seed (server’s VRF output) by querying the GLOW-dVRF servers once. Once the seed is set up, the client locally generates the pseudorandom value on demand in 0.18 ms, avoiding the client-server round-trip delay. Each value can be independently verified in 0.22 ms. This yields a 400× improvement in terms of output generation and 20× improvement in verification cost over existing solutions. Image showing part 2 of abstract.
May 21, 2025 at 2:48 PM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
simonsinstitute.bsky.social
We welcomed a merry band of cryptographers to the Institute this week!

Check out their boot camp, now underway — with a focus on obfuscation, proof systems, and secure computation. Register to view the livestream or gain early access to recordings.

simons.berkeley.edu/workshops/cr...
May 22, 2025 at 1:48 AM
aravind16coiner.bsky.social
Verifiable randomness as a service on blockchains! #Randomness #Randomness #Everywhere
May 20, 2025 at 1:46 AM
aravind16coiner.bsky.social
Wonderful event from our school to honor the top achieving students. This is in addition to the university level recognition.
sydneycompsci.bsky.social School of Computer Science, University of Sydney @sydneycompsci.bsky.social · May 19
Celebrating our incredible #USyd #ComputerScience students 🎓 during the School of CS' Award Ceremony last Thursday! A truly inspiring cohort: on behalf of the School, lecturers, and professional staff, congratulations! @sydney.edu.au
A group of the students receiving an award at the ceremony, on stage: presented by Dr. Suranga Seneviratne and Prof. Jinman Kim. A group of the students receiving an award at the ceremony, on stage: presented by Prof. Natialiia Stratiienko and Prof. Jinman Kim. A group of the students receiving an award at the ceremony, on stage: presented by Dr Mohammad Polash and Prof. Jinman Kim. Prof. Tony Wirth, Associate Head of School, introducing the ceremony
May 19, 2025 at 1:34 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
The photos above are, of course, only a small sample of the many students we celebrated last week! To paraphrase, this BlueSky margin is too narrow to contain our so-many high-achieving students!
May 19, 2025 at 1:27 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
Celebrating our incredible #USyd #ComputerScience students 🎓 during the School of CS' Award Ceremony last Thursday! A truly inspiring cohort: on behalf of the School, lecturers, and professional staff, congratulations! @sydney.edu.au
A group of the students receiving an award at the ceremony, on stage: presented by Dr. Suranga Seneviratne and Prof. Jinman Kim. A group of the students receiving an award at the ceremony, on stage: presented by Prof. Natialiia Stratiienko and Prof. Jinman Kim. A group of the students receiving an award at the ceremony, on stage: presented by Dr Mohammad Polash and Prof. Jinman Kim. Prof. Tony Wirth, Associate Head of School, introducing the ceremony
May 19, 2025 at 1:22 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
Our HCI team received *five* awards at #CHI'25! All of these received best paper honourable mention awards, which are awarded to the top 5% of submissions. #USyd @sydney.edu.au showed up strong at CHI 2025! 🎉🎉🎉
May 16, 2025 at 1:53 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
The paper can be found here: dl.acm.org/doi/full/10....

The award list: programs.sigchi.org/chi/2025/awa...
Estimating the Effects of Encumbrance and Walking on Mixed Reality Interaction | Proceedings of the 2025 CHI Conference on Human Factors in Computing Systems
You will be notified whenever a record that you have chosen has been cited.
dl.acm.org
May 16, 2025 at 1:26 AM
aravind16coiner.bsky.social
Congrats to the team of authors from @sydneycompsci.bsky.social @sydney.edu.au for this amazing recognition!
sydneycompsci.bsky.social School of Computer Science, University of Sydney @sydneycompsci.bsky.social · May 16
🎉🎉🎉 The paper also won "Honorable Mention Award at CHI 2025". The award recognises this work for advancing the understanding of how people can effectively control supernumerary (extra) arms. #Award #CHI'25

Award list: chi2025.acm.org/best-paper-a...
CHI 2025 Yokohama, Japan
CHI 2025 Yokohama, Japan
chi2025.acm.org
May 16, 2025 at 1:42 AM
Reposted by Aravind (Sri AravindaKrishnan Thyagarajan)
sydneycompsci.bsky.social
🎉🎉🎉 The paper also won "Honorable Mention Award at CHI 2025". The award recognises this work for advancing the understanding of how people can effectively control supernumerary (extra) arms. #Award #CHI'25

Award list: chi2025.acm.org/best-paper-a...
CHI 2025 Yokohama, Japan
CHI 2025 Yokohama, Japan
chi2025.acm.org
May 16, 2025 at 1:35 AM
aravind16coiner.bsky.social
I will be talking about how we can achieve fairness in this unfair world using cryptography! pintofscience.com.au/event/what's... #Pint25 Tickets are getting sold fast. Don't miss out! Excited for this event as it is my first time.
What's hidden in the code?
Join us as we discover the hidden codes that shape our world: from cryptography that can ensure fairness online to epigenetics controlling our cells and bo…
pintofscience.com.au
May 9, 2025 at 12:29 AM