XOR Decoder with Automatic Key Recovery
Decode XOR-encrypted payloads even when you do not know the key. CyberNexus Decoder recovers single-byte and multi-byte XOR keys using null-byte frequency analysis, known-plaintext correlation (PE, ZIP, XML headers), and autocorrelation — then decrypts in one step.
Open the xor decoder tool →How to use the xor decoder
- Paste or upload the XOR-encrypted payload.
- Run "XOR Key Recovery" to automatically recover the key.
- Review the recovered key (hex and ASCII) and the decrypted output.
- If the payload is Base64-wrapped, use "Base64 + XOR Combo Decode" instead.
Features
- Automatic single-byte and multi-byte key recovery (up to 32 bytes).
- Known-plaintext attacks against common file headers.
- Manual XOR with UTF-8 or Hex keys also supported.
- Combined Base64 + XOR decoding for layered malware.
Frequently asked questions
Can I decode XOR without knowing the key?
Yes. XOR Key Recovery uses statistical analysis and known-plaintext attacks to recover the key automatically, then decrypts the payload.
Does it support multi-byte XOR keys?
Yes. The recovery engine handles repeating multi-byte keys up to 32 bytes using autocorrelation.