There are disclosed methods and a system for safe management of various devices of a vehicle. These are car alarm system, immobilizer, central lock, etc. The method can be used in on-board computer of car and in various separate devices managing other devices in car. The method is applicable as a safety measure for all situations where safe management of devices is required, for example, managing the premises security. A central unit and folding key exchanges data via an encrypted channel. Each time the folding key and central unit interchange data, there is formed unique data set so even if the malicious third party intercepts data they will not be able to use it for future interactions.