DES uses a 64-bit key.

Sequence encryption is a series of encryptions and decryptions between a number of systems, wherein each system in a network decrypts the message sent to it and then reencrypts it using different keys and sends it to the next neighbor, and this process continues until the message reaches the final destination.

Two hundred and eighty five computers can crack a 56-bit key in one year, ten times as many would do it in a little over a month.

A method of encryption that requires the same secret key to encipher and decipher the message is known as ____ encryption.

One encryption method made popular by spy movies involves using the text in a book as the key to decrypt a message.

Hash algorithms are public functions that create a hash value by converting variable-length messages into a single fixed-length value.

A(n) registration authority issues, manages, authenticates, signs, and revokes users’ digital certificates, which typically contain the user name, public key, and other identifying information.

Complete loss of power for a moment is known as a(n) ____.

The most common hybrid system is based on the Diffie-Hellman Key Exchange method, which is a method for exchanging private keys using public key encryption.

SHA-1 produces a(n) _____-bit message digest, which can then be used as an input to a digital signature algorithm.