Question 1

To encipher means to decrypt, decode, or convert ciphertext into the equivalent plaintext. _________________________

Accepted Answer

decipher

Question 2

Nonrepudiation means that customers or partners can be held accountable for transactions, such as online purchases, which they cannot later deny.

Accepted Answer

Nonrepudiation is a security principle that ensures that a party cannot deny the authenticity or integrity of a digital message or transaction. It is often used in electronic commerce to ensure that customers or partners cannot later deny that they made a purchase or entered into a contract.

Question 3

Ciphertext or a cryptogram is an encoded message, or a message that has been successfully encrypted. _________________________

Accepted Answer

A ciphertext or cryptogram is a message that has been encoded or encrypted, making it unintelligible without the proper decryption key.

Question 4

As DES became known as being too weak for highly classified communications, Double DES was created to provide a level of security far beyond that of DES. _________________________

Accepted Answer

Triple

Question 5

In a book cipher, the key consists of a list of codes representing the page number, line number, and word number of the plaintext word. _________________________

Accepted Answer

ciphertext, cryptogram

Question 6

AES implements a block cipher called the Rijndael Block Cipher. _________________________

Accepted Answer

The Rijndael block cipher was selected by NIST to be the Advanced Encryption Standard (AES) in 2001. Therefore, AES implements the Rijndael Block Cipher.

Question 7

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

Accepted Answer

This statement is true. Hash algorithms take in variable-length messages and convert them into a fixed-length value, which is called a message digest or hash. Examples of commonly used hash algorithms include SHA-256 and MD5.

Question 8

Secure Electronic Transactions was developed by MasterCard and Visa in 1997 to protect against electronic payment fraud.

Accepted Answer

Secure Electronic Transactions (SET) was indeed developed by MasterCard and Visa in 1997 to provide secure online transactions and protect against electronic payment fraud.

Question 9

Bluetooth is a de facto industry standard for short-range wireless communications between devices.

Accepted Answer

Bluetooth technology is widely accepted as an industry standard for short-range wireless communication between devices. It has been adopted by many manufacturers and is available on numerous devices including phones, speakers, headphones, and wearables.

Question 10

Steganography is a data hiding method that involves embedding information within other files, such as digital pictures or other images.

Accepted Answer

Steganography is indeed a data hiding method that involves embedding information within other files, such as digital pictures or other images.

Question 11

SSL builds on the encoding format of the Multipurpose Internet Mail Extensions protocol and uses digital signatures based on public-key cryptosystems to secure e-mail.

Accepted Answer

SSL (Secure Sockets Layer) is a protocol for securing internet connections, not specifically for securing email. It does not build on the MIME protocol but rather uses encryption to secure data transmitted over the internet.

Question 12

Internet Protocol Security (IPSec) is an open-source protocol framework for security development within the TCP/IP family of protocols.

Accepted Answer

IPSec is indeed an open-source protocol framework for security development within the TCP/IP family of protocols.

Question 13

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

Accepted Answer

The statement is true. The most common hybrid system is based on the Diffie-Hellman key exchange, which allows two parties to exchange a secret key over an insecure channel using public-key cryptography. This key can then be used for symmetric encryption, which is more efficient than public-key encryption for large amounts of data.

Question 14

The encapsulating security payload protocol provides secrecy for the contents of network communications as well as system-to-system authentication and data integrity verification.

Accepted Answer

The Encapsulating Security Payload (ESP) protocol is used to provide confidentiality, authentication, and integrity of network packets. It is a protocol used in IPsec (Internet Protocol Security) for securing IP packets. It provides end-to-end security which includes the encryption of the data, verification of the sender, and integrity checks to prevent packet modification during transmission.

Question 15

Encryption is the process of converting the ciphertext message back into plaintext so that it can be readily understood. _________________________

Accepted Answer

Decryption

Question 16

A multipart authentication code (MAC) is a key-dependent, one-way hash function that allows only specific recipients (symmetric key holders) to access the message digest. _________________________

Accepted Answer

message

Question 17

The S-HTTP security solution provides six services: authentication by digital signatures, message encryption, compression, e-mail compatibility, segmentation, and key management.

Accepted Answer

S-HTTP (Secure Hypertext Transfer Protocol) primarily focuses on secure transactions over the web, providing services like encryption and authentication, but it does not inherently provide all six services listed, such as e-mail compatibility and compression.

Question 18

A(n) key is the set of steps used to convert an unencrypted message into an encrypted sequence of bits that represent the message; it sometimes refers to the programs that enable the cryptographic processes. _________________________

Accepted Answer

algorithm

Question 19

Encryption methodologies that require the same secret key to encipher and decipher the message are using what is called public-key encryption. _________________________

Accepted Answer

private

Question 20

Standard HTTP (S-HTTP) is an extended version of the Hypertext Transfer Protocol that provides for the encryption of individual messages transmitted via the Internet between a client and server.

Accepted Answer

Standard HTTP does not provide encryption for individual messages, whereas HTTPS (HTTP Secure) provides encryption for all messages.

Quiz 8: Cryptography