1 page about "steganography"
TOTP based file-sharing
A webserver allowing to share files with dynamic URLs.
The files are associated with a TOTP token allowing people that knows this token to guess the URL.
The advantage here is that the URL is only working for a small amount of time.
As soon as your connection is secure against man-in-the-middle attacks, you can consider that it’s a protection against an history replaying.