east-tec InvisibleSecrets can create encrypted self-decrypting packages to be safely sent as zip files by email or if you don't want to send the package by email but save it locally, you will also have to specify a location where you want the package to be saved. All the receiver needs to decrypt the package is the correct password (no need of special programs), since the package is a program itself. You also have the option to add a message to your SFD Package to be shown after the receiver of the package will decrypt the package. This message is useful because you can transmit instructions, readme files, or other comments to the receiver of the package.