Robert A. Highbarger, 84, a cryptologist who retired from the National Security Agency in 1985, died May 23 of complications from bone cancer at Suburban Hospital in Bethesda. He lived in Potomac.

His son, Lane Highbarger, confirmed his death.

For seven years after retiring from the NSA, Mr. Highbarger was a customer consultant for Cray Inc., which develops supercomputers.

Robert Allen Highbarger was born in Muscatine, Iowa. He graduated from Northwestern University in 1950 and received a master’s degree in mathematics at the University of Iowa in 1951. He served in the Army from 1954 to 1957. He then worked at the NSA until 1985, including postings in Germany and England.

He was a former president of the Washington Map Society.

Survivors include his wife of 63 years, Virginia G. Isaacs Highbarger of Potomac; three children, Cynthia Obermaier of Arnold, Lynn Roberts of Bowie and Lane Highbarger of Silver Spring; and five grandchildren.

— Bart Barnes