Etymology
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cryptology (n.)

1640s, "secret or occult language," from crypto- "secret, hidden" + -ology. From 1945 as "science of secret characters or codes."

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Definitions of cryptology

cryptology (n.)
the science of analyzing and deciphering codes and ciphers and cryptograms;
Synonyms: cryptanalysis / cryptanalytics / cryptography
From wordnet.princeton.edu