Cryptology Basics Quiz

The Key Exchange Problem refers to:

• The difficulty of securely transmitting a symmetric encryption key over an insecure channel

• The challenge of creating a long enough encryption key

• The need to frequently change encryption keys

• The risk of losing encryption keys

The Diffie-Hellman Key Exchange is used to:

• Encrypt messages directly

• Securely exchange symmetric keys over an insecure channel

• Generate digital signatures

• Encrypt passwords for storage

Which mathematical operation is fundamental to the security of Diffie-Hellman?

• Multiplication of prime numbers

• Modular exponentiation

• Addition of large numbers

• Matrix multiplication

4. RSA encryption is based on: A) The difficulty of solving the discrete logarithm problem B) The difficulty of factoring large prime numbers C) The unpredictability of elliptic curves D) The efficiency of symmetric key encryption

• The difficulty of solving the discrete logarithm problem

• The difficulty of factoring large prime numbers

• The unpredictability of elliptic curves

• The efficiency of symmetric key encryption

What is the difference between symmetric and asymmetric encryption?

• Symmetric encryption uses the same key for encryption and decryption, while asymmetric encryption uses a public and a private key

• Asymmetric encryption is always faster than symmetric encryption

• Symmetric encryption is only used for securing passwords, while asymmetric encryption is used for all other purposes

• Asymmetric encryption does not require keys at all

Before public-key cryptography, how were encryption keys typically exchanged?

• Through a trusted courier or physical delivery

• Using an unsecured email system

• By embedding the key directly into the encrypted message

• Encryption keys did not exist before the 1970s

Which of the following is a correct conversion of the binary number 1011 to decimal?

• 9

• 10

• 11

• 12

Convert the decimal number 23 into binary.

• 10101

• 11111

• 11000

• 10111

Convert the binary number 11001 into decimal.

• 24

• 25

• 26

• 27

Convert the decimal number 42 into binary.

• 101010

• 110010

• 100101

• 111000