What is luksbox?

LUKSbox is an open source encrypted vault tool that lets you store sensitive files in cloud storage, on USB drives, or other shared media without having to trust whoever controls that storage. The core idea is simple: you create a single encrypted container file, ending in .lbx, on your own machine, and that file gets uploaded to Dropbox, Google Drive, iCloud, or wherever you want. The cloud provider only ever sees a blob of random looking data. They cannot read it, and neither can anyone who later demands access from them. The vault mounts as a real drive on Linux, macOS, and Windows, so once unlocked you drag files in and out like normal. Unlocking requires one of several keyslots: a passphrase, a physical security key such as a YubiKey or Titan Key using the FIDO2 standard, a TPM chip built into a computer, or a hybrid approach that also uses post quantum encryption, ML-KEM-768 or ML-KEM-1024, to protect against future quantum computers that could break today's encryption. The vault header can be stored in a separate file on different storage, making the main container file completely opaque with no identifiable metadata. The project is built in Rust, released under the Apache 2.0 open source license, and is currently in pre 1.0 status. The on-disk format is described as locked, the cryptographic algorithms are established NIST and RFC standards, and the README reports 9 internal audit rounds plus more than 30 million fuzz test iterations, though an independent third party audit has not yet been completed. The README is explicit that a LUKSbox vault should be a travelling copy of data, not the only copy, since a corrupted container or lost keys means the data cannot be recovered.