Safety of transferred data is one of the main features of EQU ACC. The transmission between computers and devices is encrypted using advanced algorithms and performed after self-identification. CMAC signature and AES128 advanced encryption algorithm are used as a standard; moreover, for each connection unique encryption keys are generated that are based on codes dedicated to a specific system. These safety measures protect the system against any unauthorised access. When dynamically encrypted contactless cards are used, the system fulfils the highest safety standards (grade 3 and 4 according to PN-EN 60839-1:2014-01).