Abstract: A cryptographic anonymization method, apparatus, and system are disclosed. An example apparatus includes a server configured to receive encrypted usage information and an identifier from an application operating on a user terminal and trans-cypher the encrypted usage information from a first encryption scheme to a second encryption scheme to create second encrypted usage information without decrypting the encrypted usage information. The server is also configured to convert and encrypt the identifier to an encrypted unique identifier. The server is further configured to compare the second encrypted usage information to a taxonomy of data labels using rules. For each match of at least some of the second encrypted usage information to a data label, the server is configured to add the encrypted unique identifier to the matching data label. The server uses the data labels and/or the encrypted unique identifier for serving advertisements to the user.