Introduction to cryptography

What is cryptography?

• The study of ancient languages

• The art of hiding secret messages

• The analysis of computer viruses

• The practice of predicting future events

What is the purpose of encryption in cryptography?

• To authenticate the sender of a message

• To compress the size of a message

• To convert plaintext into ciphertext

• To ensure message delivery

Which of the following is an example of a symmetric encryption algorithm?

• RSA

• AES

• Diffie-Hellman

• Elliptic Curve Cryptography

What is a key in cryptography?

• A special character used in encoding messages

• A mathematical function used to encrypt messages

• A secret value used to encrypt and decrypt messages

• A type of encryption algorithm

Which type of encryption uses two different keys: a public key and a private key?

• Symmetric encryption

• Asymmetric encryption

• Hashing

• Steganography

Which cryptographic technique is used to verify the integrity of a message?

• Hashing

• Encryption

• Key exchange

• Digital signatures

What is a digital signature?

• A unique identifier for a digital file

• A technique to hide sensitive information within an image

• A cryptographic technique used to verify the authenticity and integrity of a message

• A type of encryption algorithm

Which encryption method involves substituting each letter with a fixed number of positions down the alphabet?

• Vigenère cipher

• Caesar cipher

• Playfair cipher

• Enigma machine

What is the main advantage of using a one-time pad encryption?

• It is impossible to break

• It is computationally efficient

• It requires minimal key management

• It allows for easy decryption

What is the purpose of a nonce in cryptography?

• To generate random numbers for encryption

• To protect against replay attacks

• To verify the integrity of a message

• To encrypt and decrypt messages