A. Replay attack

B. CrypTanalysis attack

C. Reconnaissance attack
Cryptanalysis is that the science of cracking codes and secret writing secrets. it's accustomed violate authentication schemes, to interrupt scientific discipline protocols, and, additional benignantly, to seek out and proper weaknesses in coding algorithms.
It may be employed in IW applications - for instance, shaping Associate in Nursing encrypted signal to be accepted as authentic. Competitors UN agency are ready to discover the key can currently need to use it to their advantage, thus they're going to need to send phony encrypted messages to the supply so as to gain data or gain a bonus. It might even be used to pretend to be the supply so as to send phony data to others, UN agency currently can assume that it came from the official supply.
Among the kinds of attacks are:
Ciphertext solely attacks
best-known plaintext attacks
Chosen plaintext attacks
Chosen ciphertext attacks
Man-in-the-middle attacks
aspect channel attacks
Brute force attacks
Birthday attacks
There are variety of different technical and non-technical cryptography attacks to that systems will fall victim. cryptographical attacks may be mounted not solely against coding algorithms, however conjointly against digital signature algorithms, MACing algorithms and pseudo-random variety generators.
Ciphertext solely Attack
A ciphertext solely attack (COA) could be a case within which solely the encrypted message is accessible for attack, however as a result of the language is thought a frequency analysis may be tried. during this state of affairs the aggressor doesn't apprehend something concerning the contents of the message, and should work from ciphertext solely.

D. Side-channel attack