#017 · Security ProfessionalsLegendaryLocked in

Wietse Venema

Author of TCP Wrapper and Postfix

Defensive software that a generation of admins just ran

Rating

90Impact score
Technical depth96
Defensive craft97
Research86
Influence90
FromNetherlands
Era1990–present

Domains

Host securityMail securityForensics

Scouting report

Wrote TCP Wrapper, which for years was the access control on a very large share of Unix hosts on the internet, and Postfix, a mail server written from the start around privilege separation. Co-wrote SATAN with Dan Farmer and later the Coroner’s Toolkit and Forensic Discovery, giving incident responders their first real open tooling.

Curator’s note

Shipped the defence, then shipped the tools to work out how it was beaten.

Portrait

Painted from a photograph of Wietse Venema by Alexandre Dulaunoy, licensed CC BY-SA 2.0.

Sources