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Stream Cipher

5 minutes 5 Questions

Stream ciphers are symmetric encryption methods that process messages bit-by-bit, or a byte at a time, using a keystream. A keystream is an infinite sequence of pseudorandom bits derived from a key and a nonce value. Stream ciphers apply a bitwise XOR operation between the plaintext message and the…

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CompTIA Security+ - Stream Cipher Example Questions

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Question 1

An IT company uses a stream cipher for secure communication between their servers. Recently, they experienced a security breach due to key reuse. Which of the following is the best solution?

Correct Answer: Implement unique keys for each encryption session

Key reuse in stream ciphers can lead to patterns and vulnerabilities. Using unique keys for each encryption session ensures that no patterns can be formed, hence maintaining security.

Question 2

A company wants to securely send data packets using an encryption method where each bit of the plaintext is encrypted with a separate bit of a continuous key stream. Which of the following techniques should they use?

Correct Answer: Synchronous stream cipher

Synchronous stream ciphers use a continuous key stream to encrypt plaintext bits individually, providing security and synchronous functionality.

Question 3

A company plans to use a stream cipher for video streaming on their website. Which of the following characteristics of stream ciphers is an advantage for this scenario?

Correct Answer: Low latency

Stream ciphers have low latency as they encrypt data in real-time, bit-by-bit. This characteristic is advantageous for video streaming as it allows for smooth playback and minimal buffering.

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