cryptanalysisPronunciation: /ˌkrɪptəˈnalɪsɪs/Definition of cryptanalysis noun [mass noun] the art or process of deciphering coded messages without being told the key. Derivatives cryptanalystPronunciation: /-ˈan(ə)lɪst/ noun cryptanalyticPronunciation: /-anəˈlɪtɪk/ adjective cryptanalyticalPronunciation: /-anəˈlɪtɪk(ə)l/ adjective Origin: 1920s: from crypto- + analysiscryptanalysis in other Oxford dictionaries Definition of cryptanalysis in the US English dictionary