Cryptography Unit1

What is the main goal of modern cryptography?

• To ensure that all data is publicly accessible.
• To eliminate all forms of data encryption.
• To ensure confidentiality, integrity, and authenticity of information.
• To create unbreakable codes for secret messages.

Which encryption method uses a public and private key?

• Asymmetric encryption
• Symmetric encryption
• Base64 encoding
• Hashing

Which algorithm is a popular asymmetric encryption method?

• DES
• RSA
• AES
• Blowfish

RSA encryption relies on which mathematical problem?

• Discrete logarithm problem
• Elliptic curve problem
• Integer factorization problem
• Prime number generation problem

What is the GCD of 48 and 18?

• 6
• 36
• 24
• 12

What does Euler’s Theorem state?

• If n is a positive integer, then a^n ≡ 0 (mod n).
• If n is a positive integer and a is coprime to n, then a^φ(n) ≡ 1 (mod n).
• If a is any integer, then a^φ(n) ≡ n (mod n).
• If n is a prime number, then a^n ≡ a (mod n).

What is the modular inverse of 3 modulo 7?

• 6
• 2
• 5
• 4

What is the probability of drawing an Ace from a deck of 52 cards?

• 2/13
• 1/52
• 1/26
• 1/13

What does the Caesar Cipher do?

• The Caesar Cipher replaces letters with numbers based on their position.
• The Caesar Cipher scrambles text randomly without any fixed pattern.
• The Caesar Cipher decrypts text by reversing the order of letters.
• The Caesar Cipher encrypts text by shifting letters a fixed number of places in the alphabet.

How many keys are possible in a monoalphabetic cipher?

• 26

• 100

• 26^2

• 26!