1. A computer system, comprising: one or more processors; and one or more computer-readable storage media having stored thereon computer-executable instructions that are structured such that, when executed by the one or more processors, the computer-executable instructions configure the computer system to map encryption policies to data stored in a database using a policy identifier, including computer-executable instructions that configure the computer system to perform at least the following: receive an indication of a type of encryption that is to be applied when encrypting an identified column of data that is stored in a set of one or more databases, the one or more databases having a database schema that is identified by a database schema identifier, the database schema defining one or more relationships for data that is stored in the set of one or more databases; identify a namespace of the set of one or more databases, in which the identified column of data is accessed in the same manner in each of the one or more databases; and generate a policy identifier that identifies an encryption policy including the identified type of encryption, the policy identifier comprising a hierarchical string identifying the namespace, the database schema identifier, and the identified column.