Cryptography or cryptology are basically synonyms these days. In English "cryptography" is the more common term and encompasses not just ciphers, but the entire expanded field (e.g. cryptographic hashes, key exchange schemes, secret sharing, message authentication codes, etc.).
*crypto*currency is called *crypto*currency because it's about *cryptography*, not because it's "hidden" (the original meaning of the prefix "crypto"). Calling cryptocurrency "crypto" is like calling an airplane "air".
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