Question 1

In __________cryptography, the same key is used by the sender and the receiver.&#10;A) symmetric-key&#10;B) asymmetric-key&#10;C) public-key&#10;D) open-key

Accepted Answer

In symmetric-key cryptography, both the sender and the receiver use the same key to encrypt and decrypt messages. This means that the same key needs to be kept secret and securely exchanged between the sender and receiver to maintain the confidentiality of the communication. Examples of symmetric-key cryptography include AES and DES.

Question 2

___________ means that the data must arrive at the receiver exactly as they were sent.&#10;A) Nonrepudiation&#10;B) Message integrity&#10;C) Authentication&#10;D) Secrecy

Accepted Answer

Message integrity ensures that the data is not modified, deleted, or added to in any way during transmission. It confirms that the received message is exactly the same as the sent message, and that it has not been altered in any way. Nonrepudiation refers to the assurance that the sender cannot deny sending a message, authentication refers to the process of confirming the identity of the sender or receiver, and secrecy refers to the protection of the message contents from unauthorized access or interception.

Question 3

_________ cryptography is often used for long messages.&#10;A) Symmetric-key&#10;B) Asymmetric-key&#10;C) Public-key&#10;D) Open-key

Accepted Answer

Symmetric-key cryptography is often used for encrypting long messages because it is generally faster and more efficient than asymmetric-key cryptography for large amounts of data.

Question 4

In the asymmetric-key method used for confidentiality, which key(s) is (are) publicly known?&#10;A) encryption key only&#10;B) decryption key only&#10;C) both encryption and decryption keys&#10;D) neither encryption key nor decryption key

Accepted Answer

The answer of In the asymmetric-key method used for confidentiality,...

Question 5

In RSA, if user A wants to send an encrypted message to user B, the plaintext is encrypted with the public key of _______.&#10;A) user A&#10;B) user B&#10;C) the network&#10;D) a third party.

Accepted Answer

In RSA, the plaintext is encrypted with the public key of the intended recipient (in this case, user B).

Question 6

The RSA algorithm for confidentiality uses _______ cryptography.&#10;A) asymmetric-key&#10;B) symmetric-key&#10;C) substitution&#10;D) transposition

Accepted Answer

The RSA algorithm uses asymmetric-key cryptography, which involves the use of a public key for encryption and a corresponding private key for decryption. This allows for secure communication without the need to exchange a secret shared key beforehand.

Question 7

__________means that the sender and the receiver expect confidentiality.&#10;A) Nonrepudiation&#10;B) Integrity&#10;C) Authentication&#10;D) encryption and decryption

Accepted Answer

Encryption and decryption involve the process of converting the original message into a coded form that can only be read by the intended recipient through decryption. This ensures confidentiality, meaning that only the authorized parties can access and decipher the message. Non-repudiation refers to the inability of the sender to deny sending the message, while integrity is the assurance that the message is accurate and has not been tampered with during transmission. Authentication is the process of verifying the identity of the sender or recipient.

Question 8

In _________ cryptography, the same key is used in both directions.&#10;A) symmetric-key&#10;B) asymmetric-key&#10;C) public-key&#10;D) open-key

Accepted Answer

In symmetric-key cryptography, the same key is used for both encryption and decryption. This means that when two parties are communicating, they share the same secret key and use it to both encrypt and decrypt messages. This is different from asymmetric-key cryptography (option B and C), where different keys are used for encryption and decryption. Open-key cryptography (option D) is not a commonly used term in cryptography and does not accurately describe any type of cryptography.

Question 9

Which of the following attacks is threatening availability?&#10;A) Replaying&#10;B) Modification&#10;C) Denial of service&#10;D) Decoding

Accepted Answer

Denial of Service (DoS) attacks aim to disrupt the availability of a system or network by overwhelming it with traffic or other forms of attack. Replaying and Modification attacks focus on the integrity of data, while Decoding involves confidentiality.

Question 10

In __________ cryptography, everyone has access to everyone's public key.&#10;A) symmetric-key&#10;B) asymmetric-key&#10;C) secret-key&#10;D) private-key

Accepted Answer

Asymmetric-key cryptography, also known as public-key cryptography, involves the use of a public key for encryption and a private key for decryption. In this system, everyone has access to everyone's public key, which allows for secure communication without the need for a pre-shared secret key.

Question 11

In ___________, the identity of a party is verified once for the entire duration of system access.&#10;A) entity authentication&#10;B) message integrity&#10;C) message authentication&#10;D) message encryption

Accepted Answer

The answer of In ___________, the identity of a party...

Question 12

Which of the following attacks is threatening integrity?&#10;A) Masquerading&#10;B) Traffic Analysis&#10;C) Denial of service&#10;D) Encoding

Accepted Answer

The answer of Which of the following attacks is threatening...

Question 13

_____________ means concealing the contents of a message by enciphering.&#10;A) Steganography&#10;B) Cryptography&#10;C) Compressing&#10;D) Authentication

Accepted Answer

The answer of _____________ means concealing the contents of a...

Question 14

______________means concealing the message by covering it with something else.&#10;A) Cryptography&#10;B) Steganography&#10;C) Compressing&#10;D) Authentication

Accepted Answer

The answer of ______________means concealing the message by covering it...

Question 15

___________ cryptography is often used for short messages.&#10;A) Symmetric-key&#10;B) Asymmetric-key&#10;C) Secret-key&#10;D) Open-key

Accepted Answer

The answer of ___________ cryptography is often used for short...

Question 16

Three security goals are _____.&#10;A) confidentiality, cryptography, and nonrepudiation&#10;B) confidentiality, encryption, and decryption&#10;C) confidentiality, integrity, and availability&#10;D) confidentiality, denial of service, and masquerading

Accepted Answer

The answer of Three security goals are _____.&#10;A) confidentiality, cryptography,...

Question 17

______________ can provide authentication, integrity, and nonrepudiation for a message.&#10;A) Encryption/decryption&#10;B) Digital signature&#10;C) Compression&#10;D) Key-exchange

Accepted Answer

The answer of ______________ can provide authentication, integrity, and nonrepudiation...

Deck 16: Security