Andreas Software
Free programs for Windows by Andreas Jönsson

Program

AS-File Crypt 6.0 - Encrypt files with Salsa20, ChaCha20 or HC-256.

AS-File Crypt 6.0
Screenshot of AS-File Crypt 6.0

Encryption program for files that uses Salsa20, ChaCha20 or HC-256 with a 256-bit key. The program creates an encrypted (password protected) copy of any file and the program can later be used to decrypt (restore) the original file.

Benefits

Important information: Save the downloaded program if you have information encrypted with it. I do not guarantee compatibility between different versions/revisions of the program.

> Download AS-File Crypt 6.0 (Zip, 1.21 MB)

Revision Date: 2021-09-24.
License: Freeware.
Unicode Support: Yes.
Program Type: Partly portable, x64.
Operating System(s): Windows 7 (SP1+), 8.1 and 10. (Also Windows Server 2012 R2 and 2016.)
Language(s): English and Swedish.

This is the program's official website - download the program here to get the latest version/revision. The program is free.

Speed Reference

Approximate values for an Intel Core i3-9100:
Salsa20/20, 80 MB/sec.
Salsa20/40, 40 MB/sec.
ChaCha20/20, 40 MB/sec.
ChaCha20/40, 20 MB/sec.
HC-256, 80 MB/sec.
HC-256 (Variant), 80 MB/sec.

Information regarding the integration feature

You have to run AS-File Crypt as Administrator in order to add/update or remove the integration feature. This can be done by right-clicking on the EXE file. (Note: When you make a larger Windows upgrade, this integration may be cleared, then you need to add it again.)

Portable?

The only thing that is not portable is the integration feature, but this has to be activated manually. The integration feature writes to the registry (the key "HKEY_CLASSES_ROOT").

Salsa20/40 & ChaCha20/40

If you start the program with the parameter "/SalsaChaChaDoubleRounds", the program uses Salsa20/40 and ChaCha20/40.

HC-256 Variant

If you start the program with the parameter "/HC256Variant", the program uses the proposed alternative variant of HC-256. This variant is expected to be slightly stronger.

Console Crypto

See also AS-ARC5, AS-ARC6, AS-ISAAC64, AS-LEA and AS-Rabbit. These are command line programs for encryption of files. You can also download all in one Zip file, Console_Crypto.ZIP.

For text?

Check out AS-Text Crypt 6.0.