Horst Feistel
Feistel’s work made a practical, reversible construction from repeated round functions. That design pattern remains central to the history of symmetric cryptography and to the engineering of modern encryption systems.
Horst Feistel was a cryptographer who worked on communications-security problems before joining IBM, where he led research that produced the Lucifer family of ciphers. His name is attached to the Feistel network: a structure that splits a block into two halves and applies a round function repeatedly while preserving invertibility.
Technical legacy
The Feistel construction became the architecture of the Data Encryption Standard (DES) and influenced many later block ciphers. It is significant because decryption can use the same round structure as encryption with the round keys reversed, a property that simplified practical implementations.
In memoriam
Feistel died in 1990. His name remains attached to one of the most enduring design patterns in applied cryptography.
Timeline
- 1915Born in Berlin, Germany.
- 1940sWorks on communications-security research in the United States.
- 1960sLeads IBM research on cryptographic systems, including the Lucifer line.
- 1970sThe Feistel construction becomes a key antecedent of DES.
- 1990Dies; the Feistel network remains a standard term in cryptography.
Horst Feistel
- Type
- Person
- Era
- 1940s-1990
- Born
- 1915
- Died
- 1990
- Known for
- Feistel network; Lucifer cipher research; IBM cryptography
- Tags
- cryptography, block-ciphers, ibm, symmetric-cryptography, academic-research
Created by Joas A Santos · Something wrong or want it removed? Open an issue.