About me

I am a PhD student since 01.01.2020. at Cryptography and Network Security (CNS) group at TU Darmstadt, Germany. My advisor is Dr. Jean Paul Degabriele.

My main research areas are: tweakable ciphers, authenticated encryption, secure channels, analyzing secure network protocols.

I obtained a BSc in Computer Science at Faculty of Sciences, University of Novi Sad, Serbia. After that I got my MSc in IT Security at Ruhr-University Bochum, Germany.

I contribute to the development of libreswan, an IPsec/IKEv2 open-source client.

You can find me on Linkedin, GitHub and Google Scholar, or reach me at vukasin (at) vukasink.de or vukasin.karadzic (at) tu-darmstadt.de

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Publications

Committing Authenticated Encryption: Generic Transforms with Hash Functions [PDF]

Shan Chen and Vukašin Karadžić

Advances in Cryptology - EUROCRYPT 2025

Populating the Zoo of Rugged Pseudorandom Permutations [PDF] [SLIDES] [VIDEO]

Jean Paul Degabriele and Vukašin Karadžić

Advances in Cryptology - ASIACRYPT 2023

Overloading the Nonce: Rugged PRPs, Nonce-Set AEAD, and Order-Resilient Channels [PDF]

Jean Paul Degabriele and Vukašin Karadžić

Advances in Cryptology - CRYPTO 2022

Academic Service

External reviewer: ACNS '25, ACNS '24, CCS '23, CRYPTO '23, CCS '22, CT-RSA '22, EUROCRYPT '22, CT-RSA '21, Financial Cryptography '21

Work Experience

01/2020 - ongoing

TU Darmstadt, Germany.

Research associate at CNS group (Department of Computer Science).

03/2019 - 09/2019

achelos GmbH, Paderborn, Germany.

Student assistant (software engineer) working in IPsec/IKE(v2) team.

10/2018 - 02/2019

Ruhr-University Bochum, Germany.

Student assistant for supervision of exercises in "Programming in C" Bachelor course.

Major Open Source Contributions

November 2024

The Libreswan Project

Implemented mixing preshared keys during the IKE_INTERMEDIATE exchange in IKEv2 protocol (draft-ietf-ipsecme-ikev2-qr-alt-04). More details here.

September 2018

The Libreswan Project

Implemented redirect mechanism in IKEv2 protocol (RFC 5685), as part of Google Summer of Code 2018 program. More details here.

September 2017

The Libreswan Project

Implemented mixing preshared keys in IKEv2 protocol (RFC 8784). More details here.

Other Activities

September 2024

Research visit with Shan Chen at Southern University of Science and Technology (SUSTech), Shenzhen, China.

October 2023

Co-authored the research presented in the talk "Rugged Pseudorandom Permutations and Their Applications" at Third NIST Workshop on Block Cipher Modes of Operation in Rockville, MD, USA.

April 2022

Co-authored the research presented in the talk "Overloading the Nonce: Rugged PRPs, Nonce-Set AEAD, and Order-Resilient Channels" at Real World Crypto 2022 (RWC'22) Symposium in Amsterdam, Netherlands.