cryptanalysis
Concise Oxford English Dictionary © 2008 Oxford University Press:
cryptanalysis/krɪptəˈnalɪsɪs/
▶noun the art or process of deciphering coded messages without being told the key.
– derivatives
cryptanalyst noun,
cryptanalytic adjective,
cryptanalytical adjective.
cryptanalyst noun,
cryptanalytic adjective,
cryptanalytical adjective.
'cryptanalysis' also found in these Oxford entries:

