METHOD AND SYSTEM FOR ENCRYPTION OF MESSAGES IN LAND MOBILE RADIO SYSTEMS

摘要

A method and system for authentication of sites in a land mobile radio (LMR) system and encryption of messages exchanged by the sites. In some embodiments, the method includes transmitting a certificate created by a trusted authority by applying a function to a first site public key using the trusted authority's private key to generate a reduced representation, which is encrypted with the trusted authority's private key. Other sites may receive the certificate, decrypt it using the trusted authority's public key, and authenticate the first site. The method may further include generating a session key, encrypting it with the public key of the first site, and transmitting the encrypted session key to the first site. The first site decrypts the encrypted session key with the first site's private key, and transmits a message encrypted with the shared session key to other sites for decryption using the session key.

主权项

1. A method for authenticating a plurality of sites in a land mobile radio (LMR) system and encrypting messages exchanged by the sites, the plurality of sites being connected by a data network, the method comprising:
receiving, by one or more of the plurality of sites in the LMR system, a certificate transmitted by a first site, wherein the certificate is encrypted; decrypting, by the one or more of the plurality of sites, the certificate transmitted by the first site; authenticating the first site; generating a shared session key that is valid across a group of sites in the LMR system; encrypting the shared session key; and transmitting the encrypted shared session key to the first site for use by the first site to encrypt a message for multicast transmission.