List the security attacks that cannot be prevented by encryption.

Attacks against the encryption scheme ( cryptoanalysis attacks).

•    choosen - plaintext - same as known - plaintext attack, but the analyst gets a to choose the known plaintext.

•    Cyphertext - only - Attempt to recover plaintext from encrypted text sent in the message.

•    Known - plaintext - Attempt to discover the key used when the analyst has access to the plaintext of the encrypted message.

•    Brute force.

•    Differential cryptoanalysis.

•    Linear cruptoanalysis.

•    Passive - An attack such as listening to communications then attacking the encryption shceme offline may be done.

•    Active - A common attack of this type is the main in the middle attack. During this attack the attacker may try to convience the victim that they are communicating with another party when they are really communicating with the attacker. The attacker may as use the attack to gain passwords or other vital information.

•    Dictonary attack - A means attacking a system to determine passwords from hashed or encrypted passwords.