Question 1

Which is a block cipher developed by Belgian researchers and providing 128-,192-,and 256-bit key sizes?
A)AES
B)Blowfish
C)DES3
D)RSA

Accepted Answer

AES (Advanced Encryption Standard) was developed by Belgian researchers Vincent Rijmen and Joan Daemen. It supports key sizes of 128, 192, and 256 bits, making it versatile for various security needs.

Question 2

Which is true about public key encryption?
A)It uses symmetric keys.
B)It uses two different keys.
C)Both keys must be closely protected to avoid hacking.
D)It is based on the PGP protocol.

Accepted Answer

Public key encryption uses a pair of keys: a public key, which can be shared openly, and a private key, which must be kept secret. This is why it's said to use two different keys.

Question 3

Which is NOT an encryption method?
A)AES
B)ASCII
C)DES
D)PGP

Accepted Answer

ASCII (American Standard Code for Information Interchange) is a character encoding standard for electronic communication, not an encryption method. AES (Advanced Encryption Standard), DES (Data Encryption Standard), and PGP (Pretty Good Privacy) are all encryption methods.

Question 4

Changing a message in a such a way that it can be read easily by the intended recipient but cannot be read easily by any intercepting party is called ____________.

Accepted Answer

The answer of Changing a message in a such a...

Question 5

Many encryption techniques such as XOR are easily broken because:
A)brute force techniques can break them
B)their basis in binary numbers makes them easy targets for math processors
C)their public keys are readily available
D)the underlying letter and word frequency can still be determined

Accepted Answer

The underlying letter and word frequency can still be determined, making it possible to break the encryption.

Question 6

Operations not found in normal math that can be performed on binary numbers include all of the following EXCEPT:
A)AND
B)OR
C)NOT
D)XOR

Accepted Answer

The answer of Operations not found in normal math that...

Question 7

Which is a very complicated block cipher using 128-bit keys to generate sub-keys to be applied to multiple blocks at the same time?
A)AES
B)DES
C)DES3
D)IDEA

Accepted Answer

The answer of Which is a very complicated block cipher...

Question 8

Which is a symmetric block cipher developed in 1993 that provides variable-length key sizes ranging from 32 to 448 bits?
A)AES
B)Blowfish
C)DES3
D)IDEA

Accepted Answer

Blowfish is a symmetric block cipher designed by Bruce Schneier in 1993, notable for its variable-length key, ranging from 32 bits to 448 bits, making it adaptable for both domestic and exportable use.

Question 9

Which is NOT a way in which quantum physics might improve encryption in the future?
A)Computers based on quantum physics would be much faster.
B)If someone tried to read a key without authorization,it could result in destruction of the key.
C)Transferring keys would be immune to interference with subatomic particles.
D)Transferring keys could be based on changing states of subatomic particles.

Accepted Answer

Quantum encryption improvements are primarily based on the principles of quantum mechanics, such as superposition and entanglement, rather than immunity to interference with subatomic particles. While quantum encryption can make eavesdropping detectable (as in choice B) and relies on the properties of subatomic particles for secure key distribution (as in choice D), it does not inherently provide immunity to all forms of interference, such as that from subatomic particles. The speed of quantum computers (choice A) is also a factor in their potential to improve encryption, but it's more about computational capabilities than direct encryption enhancements.

Question 10

Which is a powerful password cracker that works on Windows and Linux platforms?
A)Brutus
B)John the Ripper
C)Quantum Cracker
D)Solarwinds

Accepted Answer

John the Ripper is a well-known password cracking tool that supports various operating systems, including Windows and Linux. It is designed to detect weak Unix passwords, though it also works on other platforms.

Question 11

Which is a symmetric key encryption system?
A)AES
B)DES
C)PGP
D)RSA

Accepted Answer

The answer of Which is a symmetric key encryption system?
A)AES
B)DES
C)PGP
D)RSA...

Question 12

Which is a very early encryption method?
A)AES
B)Caesar cipher
C)DES3
D)WEP

Accepted Answer

The Caesar cipher is one of the earliest known and simplest encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is shifted a certain number of places down or up the alphabet.

Question 13

Attempting to determine a password by simply trying every possible combination within the set parameters until successful is called:
A)authentication auditing
B)brute force
C)password cracking
D)password recovery

Accepted Answer

This method is known as a brute force attack, where an attacker systematically checks all possible passwords until the correct one is found.

Question 14

An improvement over the Caesar cipher is based on ____________ substitution.

Accepted Answer

The answer of An improvement over the Caesar cipher is...

Question 15

Which type of encrypted communication is most common?
A)Computer and Internet communications
B)Radio communications
C)Telephone conversations
D)Written documents

Accepted Answer

Computer and Internet communications are the most common types of encrypted communication today, largely due to the vast amount of sensitive data transmitted over the Internet, including financial transactions, personal communications, and confidential business information. Encryption is essential for protecting this data from unauthorized access.

Question 16

Which is a weakness of Data Encryption Standard?
A)It is based on a 1970s era block cipher.
B)It's complexity in scrambling text makes it very processor-intensive and slow.
C)The key must be transmitted,thus risking it being compromised.
D)Throughput is minimal,making it a poor choice for large files.

Accepted Answer

The answer of Which is a weakness of Data Encryption...

Question 17

Which is a public key encryption standard developed by three mathematicians in 1977 that provides very high but slow security?
A)AES
B)DES
C)DES3
D)RSA

Accepted Answer

RSA is the correct answer because it is a public key encryption algorithm developed in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman, which provides high levels of security through the use of two mathematically linked keys, one public and one private.

Question 18

Which is NOT a part of a step in the XOR operation of encryption method.
A)Convert message text to ASCII
B)Convert ASCII to binary
C)XOR binary numbers with a key
D)XOR ASCII with a key

Accepted Answer

XOR operations for encryption are performed on binary data. Therefore, after converting the message text to ASCII (A) and then to binary (B), the binary numbers are XORed with a key (C). XORing ASCII directly with a key (D) is not a standard step in this process, as the XOR operation is applied to binary representations.

Question 19

The ____________ cipher is a very old encryption method used by ancient Romans.

Accepted Answer

The answer of The ____________ cipher is a very old...

Question 20

Which is a widely used public key system that is considered by many experts to be very secure and is available as a plug-in for Netscape Messenger,MSN Messenger,and other communication software?
A)AES
B)Blowfish
C)IDEA
D)PGP

Accepted Answer

PGP, or Pretty Good Privacy, is a widely used public key system known for its high level of security. It is available as a plug-in for various communication software, including Netscape Messenger and MSN Messenger, allowing users to securely encrypt their communications.

Quiz 6: Encryption

Which is a block cipher developed by Belgian researchers and providing 128-,192-,and 256-bit key sizes?

Which is true about public key encryption?

Which is NOT an encryption method?

Changing a message in a such a way that it can be read easily by the intended recipient but cannot be read easily by any intercepting party is called ____________.

Many encryption techniques such as XOR are easily broken because:

Operations not found in normal math that can be performed on binary numbers include all of the following EXCEPT:

Which is a very complicated block cipher using 128-bit keys to generate sub-keys to be applied to multiple blocks at the same time?

Which is a symmetric block cipher developed in 1993 that provides variable-length key sizes ranging from 32 to 448 bits?

Which is NOT a way in which quantum physics might improve encryption in the future?

Which is a powerful password cracker that works on Windows and Linux platforms?

Which is a symmetric key encryption system?

Which is a very early encryption method?

Attempting to determine a password by simply trying every possible combination within the set parameters until successful is called:

An improvement over the Caesar cipher is based on ____________ substitution.

Which type of encrypted communication is most common?

Which is a weakness of Data Encryption Standard?

Which is a public key encryption standard developed by three mathematicians in 1977 that provides very high but slow security?

Which is NOT a part of a step in the XOR operation of encryption method.

The ____________ cipher is a very old encryption method used by ancient Romans.

Which is a widely used public key system that is considered by many experts to be very secure and is available as a plug-in for Netscape Messenger,MSN Messenger,and other communication software?