Level 5 - Crypto Quiz 1 of 2

In the Caesar cipher, if the word "HELLO" is shifted three spaces to the right, what does it become?

• A. "KHOOR"
• B. "JGNNQ"
• C. "DOLWW"
• D. "HELLO"

How are symmetric and asymmetric encryption methods different?

• A. Symmetric encryption uses the same key to encrypt and decrypt data, whereas asymmetric encryption uses one key to encrypt and a different key to decrypt data.
• B. Symmetric encryption uses one key to encrypt and a different key to decrypt data, whereas asymmetric encryption uses the same key to encrypt and decrypt data.
• C. Symmetric encryption uses a single key for encryption only, while asymmetric encryption uses a single key for decryption only.
• D. Symmetric encryption is more secure than asymmetric encryption.

Which of the following statements about hashing is NOT correct?

• A. When a piece of data is run through a hashing algorithm, it always generates the same hash.
• B. Hashing is used on data that does not need to be decrypted, such as a password.
• C. A hash can easily be decrypted back to its original value.
• D. If even one letter in a file has been altered, the resulting hash would be different.

What does the process of "salting the hash" involve?

• A. Removing additional characters from a password before hashing it
• B. Adding random characters to a password before hashing it
• C. Increasing the complexity of a password after hashing it
• D. Reducing the complexity of a password before hashing it

What is the main function of a digital signature?

• A. Encrypting the data
• B. Providing non-repudiation
• C. Creating a secure connection
• D. Hashing the data

What is the advantage of Elliptic Curve Cryptography (ECC) over other cryptography methods?

• A. ECC is able to generate smaller keys that are more secure than most other methods.
• B. ECC uses longer keys which makes it more secure.
• C. ECC is the oldest method of cryptography.
• D. ECC is the least CPU-intensive encryption method.

What is one of the main drawbacks of symmetric encryption?

• A. It uses the same key to encrypt and decrypt data
• B. It is easily hacked
• C. The key must be shared before a user can decrypt a message
• D. It is no longer in use

Why is the Diffie-Hellman method important in cryptography?

• A. It allows two users who have never met to safely create a shared key over a public channel such as the internet.
• B. It was the first method to use hashing for encryption.
• C. It is the fastest method for encryption and decryption.
• D. It provides the most secure encryption for passwords.

What is a main feature of hybrid cryptosystems?

• A. They only use symmetric encryption.
• B. They only use asymmetric encryption.
• C. They combine the efficiency of symmetric encryption with the convenience of asymmetric encryption.
• D. They use a different key for each transmission.

What is an ephemeral key?

• A. A key that is used throughout an entire session.
• B. A key that is generated for each new session or message sent.
• C. A key that is shared publicly.
• D. A key that is used for a limited time period.