Axantum Software - (Open Source)
AxCrypt is a tool that covers the need of security by encrypting any document desired.
AxCrypt is a software utility specially designed for data encryption. Using the application is very simple since it is directly accessible from the context menu in Windows Explorer by just selecting a folder or file, and then entering a custom encryption key.
When it is needed to consult a document, the authentication key is required. If there are changes made to the file, it is automatically encrypted again. Similarly, temporary files are permanently deleted from the hard drive without a recovery is possible later. Encryption is done with a 128-bit key, which makes it impossible for hackers. It is imperative that the password to open a file, otherwise it is impossible. For editing an encrypted file, simply double-click it.
It is able to encrypt files that are more than 4 Gb, except for those who are self-extracting.
AxCrypt also includes many other features such as administration from the command line or the compression before encryption.
Further changes to make it more Vista-aware. The largest change is
re-compilation as a full Unicode application and dropping support for
Windows 95, 98, ME and NT. We're no open for translations to more
languages, as we're not limited in the texts. Filenames are still
stored in Ansi only, will be fixed in next version.