*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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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.).
And cryptanalysis is the security analysis (and attempts to break) all of the above. Hence in modern usage the short form "crypto" (in a technical context) can only reasonably refer to cryptography, and everything else descends from that.
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Thanks, but I've got better things to do with my time.
End of conversation
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