They can "roll back" for mass marketed products but not for some simple, open source software in standard C that someone runs on an old PC with PC/DOS, no hard disk and no network connection. So, when turn the power off, the PC forgets everything about the de/encryption. The only non-volatile storage is on diskette. If worried, then just burn those. With the encryption done, the output is just a base 64 file of gibberish safe to mail to the NYT, FBI, CIA, NSA, etc. And with no attempts at security, can use products from Apple, Google, and Microsoft can send such data with no problem.
The little command line programs on PC/DOS? Easy enough for middle school students to use; when that was state of the art computing, middle school students did use it.
The little command line programs on PC/DOS? Easy enough for middle school students to use; when that was state of the art computing, middle school students did use it.