Relating to the practice, methods, or science of secret communication through codes and ciphers.
Extended adjective form from 'cryptograph' using '-ical' suffix, preferred in formal or academic contexts to emphasize the systematic and scientific nature of cryptographic practice.
The rise of 'cryptographical' in academic papers coincides with cryptography shifting from a spy-craft art into a mathematical discipline taught at universities—the word itself marks this professionalization.
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