In one aspect, systems and techniques for modifying a storage structure with newly encryptable fields is described. A delta encryption system loads a current database schema and an object model for a new database schema to a memory. The current database schema includes meta information identifying multiple fields and field information for a current application build. The object model includes meta information identifying multiple fields and field information for a new application build. The fields identified by the object model meta information include one or more encryptable fields. The delta encryption system calculates a field size information for the encryptable fields and compares the meta information from the current database schema with the meta information from the object model. In response to the comparison, the delta encryption system identifies which of the encryptable fields are newly encryptable fields and modifies a database based on the calculated field size information.
