the procedures, processes, methods, etc., used to translate or interpret secret writings, as codes and ciphers, for which the key is unknown.
the science or study of such procedures.Compare cryptography(def 1).
Origin of cryptanalysis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the study of codes and ciphers; cryptography
Word Origin for cryptanalysis
C20: from cryptograph + analysis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012