METHOD FOR PROCESSING AN UPDATE FILE OF AN AVIONIC EQUIPMENT OF AN AIRCRAFT, A COMPUTER PROGRAM PRODUCT, RELATED PROCESSING ELECTRONIC DEVICE AND PROCESSING SYSTEM

This method makes it possible to validate an update file of at least one set of computer data of a piece of avionics equipment of an aircraft. The processing method is implemented within a processing system comprising a mobile terminal independent of the aircraft, an update unit integrated into the aircraft, and a database separate from the aircraft and the mobile terminal, and comprises obtaining a computed message digest, the computed message digest resulting from the application, by the update unit, of a cryptographic hash function to the update file, obtaining a reference message digest, the reference message digest being acquired by the mobile terminal by secure access to a database comprising the reference message digest, and processing the update file based on a comparison of the computed message digest with the reference message digest.