What are cryptanalysis?

Cryptanalysis

Cryptanalysis (from the Greek kryptós, "hidden", and analýein, "to loosen" or "to untie") is the art and science of analyzing information systems in order to study the hidden aspects of the systems. Cryptanalysis is used to defeat cryptographic security systems and gain access to the contents of encrypted messages, even if the cryptographic key is unknown.

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Some articles on cryptanalysis:

Black-bag Cryptanalysis
... In cryptography, black-bag cryptanalysis is a euphemism for the acquisition of cryptographic secrets via burglary, or the covert installation of keystroke logging or trojan horse software/hardware installed on (or ... Although sophisticated technology is often used, black bag cryptanalysis can also be as simple as the process of copying a password which someone has unwisely ... Black-bag cryptanalysis is in contrast to a mathematical or technical cryptanalytic attack ...
Truncated Differential Cryptanalysis
... In cryptography, truncated differential cryptanalysis is a generalization of differential cryptanalysis, an attack against block ciphers ... Whereas ordinary differential cryptanalysis analyzes the full difference between two texts, the truncated variant considers differences that are only partially determined ...
Quantum Computing Applications For Cryptanalysis
... Quantum computers, which are still in the early phases of research, have potential use in cryptanalysis ...
Partitioning Cryptanalysis
... In cryptography, partitioning cryptanalysis is a form of cryptanalysis for block ciphers ... by Carlo Harpes in 1995, the attack is a generalization of linear cryptanalysis ... the bit sums (affine transformations) of linear cryptanalysis with more general balanced Boolean functions ...