Cryptanalysis ( from the Greek kryptÃ s , `` hidden '' , and analÃ 1\/2 ein , `` to loosen '' or `` to untie '' ) is the study of methods for obtaining the meaning of encrypted information , without access to the secret information which is normally required to do so . Cryptanalysis ( from the Greek kryptÃ s , `` hidden '' , and analÃ 1\/2 ein , `` to loosen '' or `` to untie '' ) is the study of methods for obtaining the meaning of encrypted information , without access to the secret information that is normally required to do so .