# Orr Dunkelman

> Israeli cryptographer and professor

**Wikidata**: [Q27996475](https://www.wikidata.org/wiki/Q27996475)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Orr_Dunkelman)  
**Source**: https://4ort.xyz/entity/orr-dunkelman

## Summary
Orr Dunkelman is an Israeli cryptographer and computer-science professor at the University of Haifa who specializes in the design and cryptanalysis of symmetric primitives. His best-known work is co-designing SHAvite-3, a hash function that advanced to the second round of the SHA-3 competition.

## Biography
- Born: 2 December 1980, Ramat Gan, Israel
- Nationality: Israeli
- Education: Ph.D. in Computer Science, Technion – Israel Institute of Technology (2000-2006)
- Known for: co-designing the SHAvite-3 hash function and research on symmetric-key cryptanalysis
- Employer(s): University of Haifa (faculty), Weizmann Institute of Science (post-doc), École Normale Supérieure (visiting), KU Leuven (visiting)
- Field(s): Cryptography, computer security, informatics, computer science

## Contributions
Dunkelman’s most visible contribution is SHAvite-3, a second-round SHA-3 candidate hash function he co-authored with Eli Biham in 2008. The design introduced a new HAIFA (HAsh Iterative FrAmework) structure that strengthened hash functions against length-extension and multicollision attacks. Beyond SHAvite-3, Dunkelman has published numerous papers on the cryptanalysis of block ciphers and stream ciphers, exposing weaknesses in widely studied algorithms and informing the selection of secure primitives. His systematic work on meet-in-the-middle attacks, related-key differentials, and rebound attacks has become part of the standard cryptanalytic toolkit used by researchers and standards bodies when evaluating new symmetric schemes. Through open publication and conference presentations, these techniques have been incorporated into the design rationale of ISO/IEC and NIST standards, raising the overall security bar for commercial encryption and hashing products.

## FAQs
### Q: What is Orr Dunkelman’s main cryptographic achievement?
A: He co-designed SHAvite-3, a hash function that reached the second round of NIST’s SHA-3 competition and helped popularize the HAIFA construction for building secure hash functions.

### Q: Where does Orr Dunkelman teach?
A: He is a professor in the Department of Computer Science at the University of Haifa, Israel.

### Q: Who supervised his doctoral research?
A: His Ph.D. advisor at the Technion was Eli Biham, a leading Israeli cryptologist.

### Q: What languages does he use professionally?
A: Hebrew and English.

## Why They Matter
Dunkelman’s research has changed how the cryptographic community assesses the security of symmetric-key algorithms. By refining and disseminating advanced cryptanalytic techniques, he has shortened the feedback loop between proposed designs and practical attacks, forcing designers to build stronger primitives. The HAIFA framework he helped promote is now a reference construction for modern hash functions, influencing both academic research and industrial standards. His open dissemination of attack methods has allowed engineers worldwide to avoid weak algorithms, raising the baseline security of embedded systems, network protocols, and cloud services that rely on symmetric cryptography.

## Notable For
- Co-designer of SHAvite-3, a second-round SHA-3 candidate hash function (2008)
- Introduced and analyzed the HAIFA structure for building secure hash functions
- Doctoral student of renowned cryptologist Eli Biham at the Technion
- Active researcher in symmetric-key cryptanalysis with publications on meet-in-the-middle, rebound, and related-key attacks
- Faculty member at the University of Haifa contributing to Israeli and international cryptography education

## Body
### Early Life and Education
Orr Dunkelman was born on 2 December 1980 in Ramat Gan, Israel. He pursued undergraduate and graduate studies at the Technion – Israel Institute of Technology, enrolling in 2000 and defending his Ph.D. thesis in February 2006 under the supervision of Eli Biham.

### Academic Appointments
After completing his doctorate, Dunkelman undertook a post-doctoral position at the Weizmann Institute of Science. He later joined the faculty of the University of Haifa, where he currently holds a professorship in computer science. He has held visiting research roles at École Normale Supérieure and Katholieke Universiteit Leuven, broadening his collaborative network across Europe.

### Research Focus
Dunkelman’s work centers on symmetric-key cryptography. His research spans design and analysis of block ciphers, stream ciphers, and hash functions, with an emphasis on practical cryptanalytic attacks that expose design weaknesses. Key techniques he has refined include meet-in-the-middle attacks, rebound attacks, and related-key differential cryptanalysis.

### SHAvite-3 and HAIFA
In 2008 Dunkelman and Eli Biham released SHAvite-3, a hash function tailored for the NIST SHA-3 competition. The submission introduced the HAsh Iterative FrAmework (HAIFA), a method for constructing hash functions that incorporates a block counter and a salt, mitigating several known generic attacks. SHAvite-3 advanced to the competition’s second round, and the HAIFA construction has since been adopted and cited in numerous academic designs.

### Professional Service and Outreach
Dunkelman has served on program committees of leading cryptography conferences and has reviewed for NIST and ISO standardization efforts. He maintains an active online presence, sharing research updates via Twitter (@mkilmo) and Mastodon (@mkilmo@tooot.im), and publishes papers in open archives, supporting transparent scientific discourse.

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## References

1. Czech National Authority Database
2. Mathematics Genealogy Project
3. [ORCID Public Data File 2020](https://pub.orcid.org/v3.0_rc1/0000-0001-5799-2635/education/5849657)
4. [Orr Dunkelman's Personal Webpage](http://www.cs.haifa.ac.il/~orrd/)
5. [Source](http://www.cs.haifa.ac.il/~orrd/)
6. National Library of Israel Names and Subjects Authority File
7. X