Network security - cryptography

Triple DES was first standardized for use in financial applications in ANSI standard X9.17 in 1985. 

Secure Hash Algorithms with hash value lengths of 256, 384, and 512 bits are collectively known as _________ .

The Feistel structure is a particular example of the more general      structure used by all symmetric block ciphers. 

If the sender and receiver each use a different key the system is referred to as __________ encryption.

________ protects against passive attacks (eavesdropping).

The private key is known only to its owner.

A __________ processes the input elements continuously, producing output one element at a time, as it goes along.

Public key cryptography is __________ .

Cryptographic hash functions generally execute slower in software than conventional encryption algorithms such as DES

Smaller block sizes mean greater security but reduced encryption/decryption speed. 

A symmetric encryption scheme has _________ ingredients.

The most important hash function is ________.

The most common key length in modern algorithms is ________ .

Ciphertext is the scrambled message produced as output.

The advantage of a block cipher is that you can reuse keys.

__________ is a procedure that allows communicating parties to verify that received messages are authentic.

Public key algorithms are based on mathematical functions rather than on simple operations on bit patterns.

The key exchange protocol is vulnerable to a man-in-the-middle attack because it does not authenticate the participants.

_________ is the original message or data that is fed into the algorithm as input.

A _______ approach involves trying every possible key until a translation of the ciphertext into plaintext is obtained

If both sender and receiver use the same key the system is referred to as _________ encryption.