GNU Collaborative International Dictionary of English

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Found one definition

1.       
   cryptanalysis (?), n.
   1. the science which studies methods to discovering the secret meaning of encrypted messages for which one does not possess the secret decoding information (called the key).
   
   [PJC]
   
   
   2. the methods and procedures used to discover the secret meaning hidden in encrypted messages.
   
   [PJC]