Alec David Edward Muffett (born 22 April 1968) is an Anglo-American internet security expert and software engineer.. Muffett joined Sun Microsystems in 1992, working initially as a systems administrator.

He rose through the ranks to become the principal engineer for security, a position which he held until he was retrenched, with many others, in 2009[1] (shortly before Oracle acquired Sun).

[2] He created Crack, the original password cracker for Unix, and for the CrackLib password-integrity testing library.

In 2015, Muffett was named as one of the top six influential security thinkers by SC Magazine.

[3] Muffett assisted in creating .onion websites for The New York Times,[4] Wikipedia,[5] BBC News,[6] Brave,[7] Twitter,[8] The Guardian,[9] and Reddit.