According to the memoirs of a former MI5 intelligence officer, in the 1960s, Marychurch, then a young GCHQ cryptanalyst, applied computerised cluster analysis to the problem of traffic analysis of espionage traffic. Marychurch lends his name to the "Sir Peter Marychurch award", an honour given annually for work in international cryptology.
According to the memoirs of a former MI5 intelligence officer, in the 1960s, Marychurch, then an emerging GCHQ cryptanalyst, employed computerized classification methods to address the challenge of analyzing espionage communications. The recognition bearing his name, the "Sir Peter Marychurch award", is conferred annually on individuals making significant contributions to international cryptography.