Encryption️ Intermediate Quiz 1
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Encryption️ Intermediate Quiz 1
1. What is a "Block Cipher"?
A cipher that encrypts one bit at a time
An algorithm encrypting fixed-size bit groups as one unit
A cipher used only for blocking unauthorized users
2. What is a "Stream Cipher"?
An algorithm that encrypts digits or bits one by one
A protocol for streaming video securely
An encryption method that requires a constant internet connection
3. What is "Padding" in block ciphers?
Adding extra physical security to a server
Making a password longer for the user
Adding bits to the final block to reach the required size.
4. Which of these is a common stream cipher?
AES
ChaCha20
RSA
5. What is an "Initialization Vector" (IV)?
A random value ensuring identical plaintexts yield unique ciphertexts
The first letter of an encryption key
A tool for starting a VPN connection
6. Why is it dangerous to reuse an IV with the same key?
It makes the encryption process too slow
It causes the computer to crash
It reveals patterns allowing an attacker to deduce the plaintext
7. What is "ECB" (Electronic Codebook) mode?
The most secure way to encrypt images
Encrypting each block independently, often revealing patterns.
A type of digital library for encryption keys
8. What is "CBC" (Cipher Block Chaining) mode?
Plaintext XORed with previous ciphertext before encryption
A way to link multiple servers together for encryption
A protocol used for securing wireless keyboards
9. Which mode of operation turns a block cipher into a stream cipher?
ECB
RSA
CTR (Counter Mode)
10. What is "Diffusion" in a cipher?
Spreading the key over multiple servers
Changing one plaintext bit alters many ciphertext bits.
The process of deleting a key after use
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