Network security - cryptography

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

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

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

A symmetric encryption scheme has _________ ingredients.

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

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

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

Public key cryptography is __________ .

The most common key length in modern algorithms is ________ .

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

The private key is known only to its owner.

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

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

Ciphertext is the scrambled message produced as output.

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

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

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

________ protects against passive attacks (eavesdropping).

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

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

The most important hash function is ________.