Yes. Every API Key can encrypt or decrypt the data associated with its Registered Application (which has its own unique Master Encryption Key). We recommend using separate API Keys for each service or host that needs to interact with a given encrypted dataset and creating different Registered Applications for each encrypted dataset. For instance, if you use the Ubiq Platform to encrypt user database records in a web application, each back-end host should have and use a unique API Key. We strongly recommend that you create a new Registered Application for each unique application or dataset you’d like to encrypt data for.