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Cryptography: Symmetric Key Algorithms and AES

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Cryptography: Symmetric Key Algorithms and AES

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Questions and Answers

What operation is used to combine the plaintext with the key stream in RC4 encryption?

Multiplication

Addition

Bitwise Exclusive OR (correct)

Bitwise AND

Why is RC4 known to be a symmetric operation for decryption?

Because it uses bit-wise exclusive OR operation (correct)

Due to its use of asymmetric keys

By employing multiplication as its decryption technique

It uses a different algorithm for encryption and decryption

What does the Key-Scheduling Algorithm (KSA) do in RC4 encryption?

Creates the key stream using a variable-length key

Generates the secret key

Permutates each of the 256 available bytes (correct)

Uses asymmetric keys for encryption

Why has there been a call to stop using RC4 encryption algorithms?

Proof of flaws and cyber attacks Signup and view all the answers

What is the main advantage of using RC4 stream ciphers?

Ease of implementation and operation speed Signup and view all the answers

Which organization banned the usage of RC4 in TLS protocols in 2015?

Internet Engineering Task Force (IETF) Signup and view all the answers

What is a drawback identified in using RC4 stream ciphers?

Inability to operate with small data streams Signup and view all the answers

What does RC4A+ offer as an improvement over basic RC4?

Enhanced security with a longer key schedule Signup and view all the answers

What type of operation is used in RC4 encryption to combine the plaintext with the key stream?

Bitwise XOR Signup and view all the answers

What was urged by major software companies like Microsoft and Mozilla due to threat vulnerabilities associated with RC4?

To limit the use of RC4 encryption algorithms Signup and view all the answers