Free XOR Cipher Tool
Quick Tips
- • This tool runs entirely in your browser - your data stays private.
- • Press Ctrl+V (Cmd+V on Mac) to quickly paste text.
- • Use the Copy button to save your result to clipboard.
- • Bookmark this page for quick access!
Apply XOR operation with a key for simple encryption and decryption.
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Examples
Hello (key: K)
\x03\x2e\x27\x27\x24
Secret (key: KEY)
Hex encoded result...
Why Use This Tool?
What problems does this solve?
Learn how XOR forms the basis of modern cryptography. Understand stream ciphers and one-time pads. Perform quick XOR operations for analysis and debugging.
Common use cases:
- Learning fundamental cryptographic operations
- Analyzing XOR-obfuscated data (malware analysis)
- Understanding stream cipher principles
- CTF challenges involving XOR ciphers
- Quick data obfuscation (not secure)
Who benefits from this tool?
Cryptography students learning fundamentals. Security researchers analyzing obfuscated data. CTF participants. Developers understanding encryption primitives.
Privacy first: All XOR operations happen locally in your browser. Your data never leaves your device.
Frequently Asked Questions
XOR is self-inverse (A⊕K⊕K=A), fast to compute, and provides good diffusion. With a proper key, it creates perfect secrecy. It is a fundamental building block of modern ciphers.
A one-time pad uses XOR with a truly random key as long as the message, used only once. It provides mathematically proven perfect secrecy - the only unbreakable cipher. The challenge is secure key distribution.
XORing two ciphertexts encrypted with the same key reveals the XOR of the plaintexts, eliminating the key. With enough samples, the original messages can be recovered.
No, repeating a short key makes XOR trivially breakable through frequency analysis and known-plaintext attacks. Use proper encryption like AES for security.
Stream ciphers generate a pseudorandom keystream from a key and nonce. This keystream is XORed with plaintext. The security comes from the keystream generator, not the XOR itself.
XOR is used in checksums, hash functions, error detection/correction, RAID data recovery, swap operations in programming, and detecting differences between data.
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