To encrypt file and folders as parcels just drag & drop files and folders onto the Silver Key shell icon on your desktop, and enter any encryption password of your choosing. Silver Key, by default, uses the AES encryption algorithm, but you can change these and other settings by invoking the Crypto Settings utility from your Silver Key program folder.
If you don’t want to use Silver Key in quick mode open the shell to get the full options at your fingertips. There, If you switch from standard to advanced pages, you can choose from a number of installer features to control your parcel's decryption on the recipient’s computer.
Silver Key, again by default, creates standard parcels, for which the recipient has to download the free Silver Key decrypter, but you can change that during parcel creation in Properties, Parcel Type to Executable.