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File Encrypt / Decrypt

Password-encrypt any file into a .enc container and restore it later, with AES-256-GCM and no uploads

Password
A lost password cannot be recovered: nothing is uploaded or stored, and there is no backdoor to open the file again.

AES-256-GCM with a PBKDF2-HMAC-SHA256 key (210k iterations) and a random salt and IV per file. The header carries the original name and type and is authenticated as additional data, so changing a single byte breaks decryption.