what is gcm-nonceless fr?

This project is a specialized tool for recovering encrypted data when you've lost a critical piece of the decryption puzzle called a "nonce." AES-GCM is a popular encryption method that relies on a key, the actual message, and a nonce (a number used once) to scramble data. If you have the key but lose the nonce, you're normally stuck. This tool lets you work backwards and recover that missing nonce so you can decrypt your data. The tool takes the encryption key, the scrambled message, a short authentication tag, and any extra metadata, then reverses the math to figure out the missing piece. For the common 12-byte nonce format, it can pull the exact original value back out. For other sizes, it can still calculate what it needs to generate the right decryption stream and recover your data. This is explicitly for security researchers, forensics experts, and data salvage scenarios. The README gives a concrete example: recovering a hidden message with coordinates like "Meet me at 35.89278, 137.48028." You might use this if you're analyzing an old encrypted backup or database where the key is available but the nonce was stored separately and lost, or if you're studying how encryption systems fail when pieces go missing. A major tradeoff: the tool's own README warns this is "super sketchy cryptanalysis" that strips away the integrity and authenticity guarantees that make AES-GCM secure. It's labeled as hazardous for anything beyond research and forensics. Once you use this approach, you can read the data, but you lose the mathematical proof that it hasn't been tampered with.