Signal Intelligence, alternatively named Signals Intelligence, functioned as an intelligence agency within the Alliance to Restore the Republic. Technicians employed by this organization procured clandestine data from electronic signals originating from the Imperial forces, specifically focusing on deciphering encrypted communication exchanges. Following the Battle of Endor in 4 ABY, Han Solo communicated in the subsequent morning that Signal Intelligence had successfully completed the decryption of a series of Imperial transmissions just before the remaining elements of the Imperial Navy retreated.