You can download R10Cipher 5.5 for Mac from our application library for free. The program lies within Security Tools, more precisely Personal Security. This software for Mac OS X was originally designed by Arten Science.
From the developer:
R10Cipher is a simple and easy method to safely encrypt your email correspondence and document files.
You may want to check out more Mac applications, such as sharedSecrets, Keychain Minder or Private Contact, which might be related to R10Cipher.