Cybersecurity Review #2 (Ciphers)

True or False? You can strengthen the encryption of a Caesar cipher by shifting the letters twice (using two keys).

• True

• False

When using the Caesar cipher, what is the effect of increasing the shift key value?

• It makes decryption faster

• It changes the encryption to symmetric encryption

• It changes each letter by more positions in the alphabet

• It removes the need for a decryption key

Which of the following is a primary purpose of encryption?

• To make data larger in size

• To allow any user to access data

• To prevent unauthorized access to data

• To simplify data transmission

A secure cryptographic method commonly used for protecting credit card information on the internet is called:

• The Caesar cipher

• 256-bit encryption

• Simple substitution

• Polybius square

Which type of encryption requires both a public and a private key for secure communication?

• Symmetric encryption

• Asymmetric encryption

• Caesar cipher

• Hashing

What is the main disadvantage of using a Caesar cipher for encryption?

• It is too complex to implement

• It requires a large amount of computational power

• It is easily broken with modern computing

• It cannot encrypt numbers

In cryptography, what does the term "plaintext" refer to?

• Encrypted data

• Data that has been compressed

• Original, unencrypted data

• Data that has been hashed

Which of the following is an example of symmetric encryption?

• RSA

• AES

• DSA

• ECC

What is the primary function of a cryptographic hash function?

• To encrypt data

• To compress data

• To generate a unique fixed-size output from input data

• To decrypt data

Which of the following is a characteristic of a strong encryption algorithm?

• It uses a fixed key for all users

• It is easy to reverse without a key

• It produces a ciphertext that is significantly longer than the plaintext

• It is computationally infeasible to break without the key