Expert

Konstantinos (Kostas) Chalkias

Programmer @ R3

About

https://www.corda.net/

Short Intro (from LinkedIn):

Software Engineer with a PhD in Applied Cryptography. Hands-on developer and security architect with experience from large scale blockchain, fintech, fraud detection and machine learning projects.
I am currently based in London enjoying my role as a Senior Software Engineer and Lead Cryptographer for R3 and the Corda platform.

Technical Summary and Achievements (from LinkedIn):
• Ranked in the Top20 StackOverflow users coming from Greece (on Java related questions) and 1st between recent Greek StackOverflow members joined StackOverflow after 2014.
• 15+ years in software engineering acting as a Team Leader and Lead Software Developer in various US, UK and Greek based entities. CTO for 6 years in a Big Data and Security oriented US-based startup.
• An active Cryptography and Big Data researcher, currently focusing on blockchain security and novel smart contracts, post quantum signatures and zero knowledge proofs.

Interests

Google Presence

Konstantinos (Kostas) Chalkias - Senior Associate, Software ...
Konstantinos (Kostas) Chalkias - Senior Associate, Software ...
View Konstantinos (Kostas) Chalkias' profile on LinkedIn, the world's largest professional community. ... Inspired by the blockchain architecture and existing"
Konstantinos Chalkias - Blockchain Live
Konstantinos Chalkias - Blockchain Live
Kostas is a Cryptographer and Platform Engineer at R3 currently focusing on applying advanced encryption, post-quantum digital signatures and zero ..."
Konstantinos Chalkias - Google Scholar Citations
Konstantinos Chalkias - Google Scholar Citations
Follow. Konstantinos Chalkias ... K Chalkias, D Hristu-Varsakelis, G Stephanides ... transaction fee: Alternative reward schemes for miners in blockchain systems."
Konstantinos (Kostas) Chalkias | Bpeople.io - Blockchain People ...
Konstantinos (Kostas) Chalkias | Bpeople.io - Blockchain People ...
View Konstantinos (Kostas) Chalkias' profile on LinkedIn, the world's largest professional community. ... Inspired by the blockchain architecture and existing"."
kchalkias (Konstantinos Chalkias) · GitHub
kchalkias (Konstantinos Chalkias) · GitHub
Konstantinos Chalkias kchalkias. Applied Cryptographer ... Corda is an open source blockchain project, designed for business from the start. Only Corda allows ..."
Why Firelotto's blockchain-based random engine is not fair? - Medium
Why Firelotto's blockchain-based random engine is not fair? - Medium
24 janv. 2018 - Firelotto is a blockchain-based lottery launched on January 1, 2018. It advertises ... Konstantinos Chalkias (Cryptographer and Soft. Engineer)"
Re: [BlockchainGreece-1] looking for meetup sponsors - Bitcoin ...
Re: [BlockchainGreece-1] looking for meetup sponsors - Bitcoin ...
27 janv. 2017 - Bitcoin & Blockchain Tech Meetup (Thessaloniki) ... Kostas. On Fri, Jan 27, 2017 at 3:01 PM, Konstantinos Chalkias <[address removed]> wrote ..."
Greek Night! The Crypto and Cipher kind with Corda specialists - Meetup
Greek Night! The Crypto and Cipher kind with Corda specialists - Meetup
The Crypto and Cipher kind with Corda specialists, Kostas & Tasos ... in Corda" - join Konstantinos (Kostas) Chalkias, R3 Cryptographer and Corda Platform ... 7:40 PM "Blockchain and Big Data: Corda smart contracts for fair lotteries and data ..."
Blockchain 2018 papers
Blockchain 2018 papers
1570441733, Hybrid-IoT: Hybrid Blockchain Architecture for Internet of ... 1570449486, Window Based BFT Blockchain Consensus, Mohammad Jalalzai; Costas ... Konstantinos Chalkias; James Brown; Mike Hearn; Tommy Lillehagen; Igor ..."

Projects

Papers

2019
Hash subtrees for grouping components by component type
Hash subtrees for grouping components by component type
K Chalkias, MC Hearn, R Parker, A Dagys
US Patent App. 15/720,201
0
2019
2018
ZKProof Standards Implementation Track
ZKProof Standards Implementation Track
PW Sean Bowe, Kobi Gurkan, Eran Tromer, Benedikt Bünz, Konstantinos Chalkias ...
https://zkproof.org/proceedings-snapshots/zkproof-implementation-20180801.pdf
0
2018
2018
Blockchained Post-Quantum Signatures
Blockchained Post-Quantum Signatures
K Chalkias, J Brown, M Hearn, T Lillehagen, I Nitto, T Schroeter
IEEE Blockchain 2018
0
2018
2018
Why Firelotto’s blockchain-based random engine is not fair?
Why Firelotto’s blockchain-based random engine is not fair?
K Chalkias, A Kichidis
https://medium.com/@chalkias/why-firelottos-blockchain-based-random-engine …
0
2018
2017
Demonstrate how Zero-Knowledge Proofs work without using maths
Demonstrate how Zero-Knowledge Proofs work without using maths
K Chalkias, M Hearn
CordaCon 2017 1 (1), 1-5
0
2017
2016
System configurations for encryption of contest data parts
System configurations for encryption of contest data parts
G Brintalos, K Chalkias
US Patent App. US15/179,687
0
2016
2016
Going beyond the coinbase transaction fee: Alternative reward schemes for miners in blockchain systems
Going beyond the coinbase transaction fee: Alternative reward schemes for miners in blockchain systems
H Gjermundrød, K Chalkias, I Dionysiou
Proceedings of the 20th Pan-Hellenic Conference on Informatics, 35
2
2016
2012
The Concept of Compatibility between Identity-based and Certificateless Encryption Schemes.
The Concept of Compatibility between Identity-based and Certificateless Encryption Schemes.
A Polychroniadou, K Chalkias, G Stephanides
SECRYPT, 403-407
0
2012
2012
A Compatible Implementation between Identity-based and Certificateless Encryption Schemes.
A Compatible Implementation between Identity-based and Certificateless Encryption Schemes.
A Polychroniadou, K Chalkias, G Stephanides
WEBIST, 225-230
1
2012
2011
Automatic Identification of Low-Risk Trading Opportunities in Sport Betting Exchange Markets
Automatic Identification of Low-Risk Trading Opportunities in Sport Betting Exchange Markets
M Ioulianou, I Christofi, K Talattinis, K Chalkias, G Stephanides
BALCOR 2011 108
1
2011
2010
Practical Implementation of Identity Based Encryption for Secure E-mail Communication
Practical Implementation of Identity Based Encryption for Secure E-mail Communication
A Kihidis, K Chalkias, G Stephanides
2010 14th Panhellenic Conference on Informatics, 101-106
4
2010
2010
Parallel collection of live data using Hadoop
Parallel collection of live data using Hadoop
K Talattinis, A Sidiropoulou, K Chalkias, G Stephanides
2010 14th Panhellenic Conference on Informatics, 66-71
14
2010
2010
Attacks on the AKACP Protocol
Attacks on the AKACP Protocol
K Chalkias, F Baldimtsi, D Hristu-Varsakelis, ST Halkidis, G Stephanides
IACR Cryptology ePrint Archive
1
2010
2010
Secure Cryptographic Protocols and Applications based on Bilinear Pairings
Secure Cryptographic Protocols and Applications based on Bilinear Pairings
K Chalkias
https://drive.google.com/file/d/1apDLir0es-FkQYXTB9WTwO1P41l4Vo0u/edit, 189
0
2010
2008
An Implementation Infrastructure for Server-Passive Timed-Release Cryptography
An Implementation Infrastructure for Server-Passive Timed-Release Cryptography
K Chalkias, F Baldimtsi, D Hristu-Varsakelis, G Stephanides
2008 The Fourth International Conference on Information Assurance and …
2
2008
2008
A versatile secure protocol for anonymous timed-release encryption
A versatile secure protocol for anonymous timed-release encryption
D Hristu-Varsakelis, K Chalkias, G Stephanides
Journal of Information Assurance and Security 2, 80-88
4
2008
2008
Mathematical problems and algorithms for timed-release encryption
Mathematical problems and algorithms for timed-release encryption
K Chalkias, F Baldimtsi, D Hristu-Varsakelis, G Stephanides
Bulletin of the Transilvania University of Brasov 15 (50), 1-4
5
2008
2008
Pairing-Based Timed-Release Cryptography
Pairing-Based Timed-Release Cryptography
K Chalkias, F Baldimtsi, D Hristu-Varsakelis, G Stephanides
NIST Identity Based Encryption Workshop
2
2008
2008
2007
Improved anonymous timed-release encryption
Improved anonymous timed-release encryption
K Chalkias, D Hristu-Varsakelis, G Stephanides
European Symposium on Research in Computer Security, 311-326
37
2007
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