Abstract: There is provided a safe data signer device and methods to organize a safe data signer device so that certificate located there is completely isolated from unwanted access. The user certificate cannot be copied from this device to any other computer device. The certificate can only be written on the safe data signer once, although in at a future point, this certificate can be rewritten by a new certificate. The method and device assures that the certificate cannot be used even if malicious parties get physical access to the device.

Abstract: 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.

Abstract: 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.