Definition(s)
Cryptanalysis
The operations performed in defeating or circumventing cryptographic protection of information by applying mathematical techniques and without an initial knowledge of the key employed in providing the protection.
Extended Definition: The study of mathematical techniques for attempting to defeat or circumvent cryptographic techniques and/or information systems security.
Adapted from: CNSSI 4009, NIST SP 800-130
Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global Standards