Question 1

How do I use unXOR with Docker to decrypt a file?

Accepted Answer

First, pull the Docker image with 'docker pull tomchop/unxor', then run it with a mounted volume, e.g., 'docker run --rm -v $PWD:/data tomchop/unxor -f encrypted.bin -g known_text'. The decrypted file will be saved in the same directory. This method is portable and avoids local installation hassles.

Question 2

What's the difference between unXOR and xortool for XOR decryption?

Accepted Answer

unXOR focuses on known-plaintext attacks with linear complexity, making it efficient when plaintext is known, while xortool often includes frequency analysis and brute-force methods for unknown plaintext. unXOR is better for targeted decryption in forensic analysis, whereas xortool might be more versatile for exploratory attacks.

Question 3

Can unXOR handle multi-byte XOR keys or rolling keys?

Accepted Answer

Yes, it supports keys up to half the length of the known plaintext, so it can handle multi-byte keys. However, for rolling or dynamically changing keys, it may not be effective as it assumes a static keystream for the attack, limiting its use in more complex encryption schemes.

Question 4

Is unXOR suitable for brute-forcing XOR keys without any plaintext?

Accepted Answer

No, unXOR is not designed for brute-force attacks; it requires known plaintext to deduce the keystream efficiently. For brute-forcing, tools like XORBruteForcer or xortool with frequency analysis are more appropriate, as they don't rely on prior knowledge.

Question 5

How do I install unXOR on a Windows system for malware analysis?

Accepted Answer

On Windows, you can use the Docker implementation for ease, or install Golang and run 'go get github.com/tomchop/unxor' from a command line. Alternatively, use the Python script, but ensure Python is installed and dependencies are met, which might require additional setup compared to Linux environments.

Question 6

What happens if my known plaintext is shorter than the XOR key length?

Accepted Answer

unXOR will fail or produce incorrect results, as it only works when the known plaintext is at least twice the length of the key. The README specifies it handles keys up to half the known plaintext length, so using a longer known text or supplementing with guesses is necessary.

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