# Chapter Eight -- Rockey4ND Envelope Encryption
Envelope encryption is a good solution if you do not have the source code or the time to use the API functions. Envelope encryption only works with applications based on Linux. For increased software protection it is strongly suggested to use both the Envelope and API implementations. Below we will discuss how to use the Envelope Encryption: Step 1. Open the terminal of the system： Step 2. R4ndenv under the directory “ROCKEY4ND/enveloper” is the Rockey4ND Envelope Encryption tool： Step 3. We can see the contents of the following after runing r4ndenv： Step 4. You can run the envelope encryption by yourself in accordance to the above examples. For example： Step 5. You can view the encrypted applications of the above-mentioned example： This is OK!
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