Robert H. Morris Sr. (July 25, 1932 – June 26, 2011) was an American cryptographer and computer scientist.

Family and education

Morris was born in Boston, Massachusetts. His parents were Walter W. Morris, a salesman, and Helen Kelly Morris, a homemaker. He received a bachelor's degree in mathematics from Harvard University in 1957 and a master's degree in applied mathematics from Harvard in 1958. He married Anne Farlow, and they had three children together: Robert Tappan Morris (author of the 1988 Morris worm), Meredith Morris, and Benjamin Morris.

Bell Labs

From 1960 until 1986, Morris was a researcher at Bell Labs and worked on Multics and later Unix. Together with Douglas McIlroy, he created the M6 macro processor in FORTRAN IV, which was later ported to Unix. Using the TMG compiler-compiler, Morris, together with McIlroy, developed the early implementation of the PL/I compiler called EPL for the Multics project. The pair also contributed a version of runoff text-formatting program for Multics. Morris's contributions to [early versions of Unix](https://bliptext.com/articles/research-unix)[ ](https://bliptext.com/articles/crypt-unix)include[ ](https://bliptext.com/articles/crypt-unix)the[ ](https://bliptext.com/articles/crypt-unix)math[ ](https://bliptext.com/articles/crypt-unix)library,[ ](https://bliptext.com/articles/crypt-unix)the[ ](https://bliptext.com/articles/crypt-unix)[dc[ ](https://bliptext.com/articles/crypt-unix)programming[ ](https://bliptext.com/articles/crypt-unix)language](https://bliptext.com/articles/dc-programming-language),[ ](https://bliptext.com/articles/crypt-unix)the[ ](https://bliptext.com/articles/crypt-unix)program,[ ](https://bliptext.com/articles/crypt-unix)and[ ](https://bliptext.com/articles/crypt-unix)the[ ](https://bliptext.com/articles/crypt-unix)password[ ](https://bliptext.com/articles/crypt-unix)encryption[ ](https://bliptext.com/articles/crypt-unix)scheme[ ](https://bliptext.com/articles/crypt-unix)used[ ](https://bliptext.com/articles/crypt-unix)for[ ](https://bliptext.com/articles/crypt-unix)user[ ](https://bliptext.com/articles/crypt-unix)authentication. The encryption scheme (invented by Roger Needham), was based on using a trapdoor function (now called a key derivation function) to compute hashes of user passwords which were stored in the file ; analogous techniques, relying on different functions, are still in use today.

National Security Agency

In 1986, Morris began work at the National Security Agency (NSA). He served as chief scientist of the NSA's National Computer Security Center, where he was involved in the production of the Rainbow Series of computer security standards, and retired from the NSA in 1994. He once told a reporter that, while at the NSA, he helped the FBI decode encrypted evidence. There is a description of Morris in Clifford Stoll's book The Cuckoo's Egg. Many readers of Stoll's book remember Morris for giving Stoll a challenging mathematical puzzle (originally due to John H. Conway) in the course of their discussions on computer security: What is the next number in the sequence 1 11 21 1211 111221? (known as the look-and-say sequence). Stoll chose not to include the answer to this puzzle in The Cuckoo's Egg, to the frustration of many readers. Robert Morris died in Lebanon, New Hampshire.

Quotes

Selected publications