# David Chaum

> American computer scientist and cryptographer

**Wikidata**: [Q1173973](https://www.wikidata.org/wiki/Q1173973)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/David_Chaum)  
**Source**: https://4ort.xyz/entity/david-chaum

## Summary
David Chaum is an American computer scientist, mathematician, inventor, and cryptographer. He is the founder of the xx network and the CEO of Elixxir.io, and he was named an IACR Fellow in 2004 for his contributions to cryptography.

## Biography
- Born: 1955
- Nationality: United States
- Education: University of California, Berkeley
- Known for: Work in computer science and cryptography; founder of xx network; CEO of Elixxir.io
- Employer(s): Founder, xx network; CEO, Elixxir.io (as listed in participant references)
- Field(s): Computer science, cryptography, mathematics

## Contributions
David Chaum has combined academic and industry activity across cryptography and computer science. He is listed as the founder of the xx network and as CEO of Elixxir.io (noted in participant records for the Middle East and Africa Summit 2022). In academia he was advised by Bernard Marcel Mont-Reynaud and supervised doctoral students including J. Norbert Eelco Bos and Stefan Popoveniuc, contributing to the training of later researchers. Chaum was recognized as an IACR Fellow in 2004, an honor that marks sustained contributions to the cryptographic research community. He maintains an official website (http://www.chaum.com/) and has a visible professional presence across authority files and bibliographic databases (including MathGenealogy Project ID 118579, DBLP author record c/DavidChaum, MR author ID 47740, and numerous national library identifiers). Public records list his residence in Sherman Oaks and record an Erdős number of 3. These combined activities reflect both scholarly output and industry leadership documented in the provided sources.

## FAQs
### Q: Who is David Chaum?
A: David Chaum is an American computer scientist, mathematician, inventor, and cryptographer. He is known as the founder of the xx network and as CEO of Elixxir.io.

### Q: What formal recognition has he received?
A: He was named an IACR Fellow in 2004, a designation awarded by the International Association for Cryptologic Research.

### Q: Where was he educated?
A: He was educated at the University of California, Berkeley.

### Q: Has he supervised doctoral students?
A: Yes. His doctoral students listed in the record include J. Norbert Eelco Bos and Stefan Popoveniuc.

### Q: How can I find more about his work?
A: He maintains an official website at http://www.chaum.com/ and has bibliographic and authority records across DBLP, MathGenealogy, MR Author, and national library identifiers.

## Why They Matter
David Chaum's recorded roles bridge research and industry leadership. His designation as an IACR Fellow in 2004 signifies peer recognition within the international cryptography community. As a founder and executive (xx network; Elixxir.io), he occupies positions that link academic cryptographic expertise with organizational and product initiatives, as reflected by his participation in public industry events such as the Middle East and Africa Summit 2022. His mentorship of doctoral students extends his influence through subsequent generations of researchers. Extensive cataloging across academic and national authority databases (DBLP, MR, MathGenealogy, library authority IDs, VIAF) documents a sustained scholarly footprint. Without individuals who both publish in and organize around cryptography, the field’s technical advances and their translation into applied systems would be less connected; the provided record shows Chaum as one of the professionals filling that role through recognized scholarship, organizational leadership, and documented mentorship.

## Notable For
- Named an IACR Fellow in 2004 (International Association for Cryptologic Research).
- Founder of the xx network (listed role in participant references).
- CEO of Elixxir.io (listed role in participant references).
- Educated at the University of California, Berkeley and listed with MathGenealogy Project ID 118579.
- Erdős number of 3 and documented supervisory relationships with doctoral students J. Norbert Eelco Bos and Stefan Popoveniuc.

## Body

### Personal and identity data
- Full name: David Lee Chaum.
- Aliases include variants in other scripts (e.g., デイビット・ショーン, Чаум, Дэвид).
- Sex/gender: male.
- Residence: Sherman Oaks (as recorded in available references).
- Birth year: 1955.

### Education and academic lineage
- Educated at the University of California, Berkeley (institution recorded).
- Doctoral advisor: Bernard Marcel Mont-Reynaud.
- Doctoral students: J. Norbert Eelco Bos; Stefan Popoveniuc.
- Mathematics Genealogy Project ID: 118579.
- Erdős number: 3.

### Professional roles and affiliations
- Occupations listed: cryptographer, mathematician, computer scientist, inventor.
- Participant records list him as founder of the xx network and as CEO of Elixxir.io (noted in summit participant metadata for 2022).
- Recognized as an IACR Fellow in 2004.

### Scholarly and bibliographic presence
- DBLP author ID: c/DavidChaum.
- MR (Mathematical Reviews) author ID: 47740.
- ZBMATH author ID: chaum.david.
- ACM digital library author ID: 81100121641.
- Library of Congress authority ID: n82220906.
- VIAF ID: 94442415 and numerous national library identifiers (e.g., national library of Israel, Poland).
- WorldCat entities ID: E39PBJv4m4M6vjX4Rh7JRFFHYP.

### Public-facing presence
- Official website: http://www.chaum.com/ (English).
- Twitter handle recorded as chaumdotcom with historic follower counts recorded at multiple points in time.
- Wikimedia Commons image available: https://commons.wikimedia.org/wiki/Special:FilePath/Chaum.jpg.

### Awards and recognition
- IACR Fellow, 2004 (International Association for Cryptologic Research).

### Miscellaneous
- Citizenship: United States.
- Instance: human; sitelink_count: 14 across data sources.
- Maintained by: WikiProject Mathematics (per maintenance metadata).

## References

1. [Source](https://www.iacr.org/fellows/2004/chaum.html)
2. Mathematics Genealogy Project
3. International Standard Name Identifier
4. MAK
5. Google Knowledge Graph
6. Virtual International Authority File
7. Middle East and Africa Summit 2022 - Speakers
8. Golden
9. National Library of Israel Names and Subjects Authority File