Over deze norm
This document establishes a method of encrypting certain of the elements of the ALERT-C coded data carried in the RDS-TMC type 8A data group, such that without application by a terminal or receiver of an appropriate keys, the information conveyed is virtually worthless. Before a terminal is able to decrypt the data, the terminal requires two 'keys'. The first 'key' is given in confidence by the service provider to terminal manufacturers with whom they have a commercial relationship; the second 'key' is broadcast in the 'Encryption Administration group', which is also a type 8A Group. This specification explains the purpose of the two 'keys' and how often and when the transmitted 'key' may be changed. Before an individual terminal may present decrypted messages to the end-user, it must have been activated to do so. Activation requires that a 'PIN' code be entered. The PIN code controls access rights to each service and subscription period, allowing both 'lifetime' and 'term' business models to co-exist. The specification also describes the considerations for service providers wishing to introduce an encrypted RDS-TMC service, migrating from either a 'free-to-air' service based on public 'Location Tables' or a commercial service based on a proprietary 'Location Table'. Finally, 'hooks' have been left in the bit allocation of the type 8A group to allow extension of encryption to other RDS-TMC services.
|Nederlandse titel||Verkeers- en reizigersinformatie (TTI) - TTI-berichten via TMC - Deel 6: Encryptie en voorwaardelijke toegang tot Radio Data System - Traffic Message Channel met ALERT C|
|Engelse titel||Traffic and Travel Information (TTI) - TTI Messages via traffic message coding - Part 6: Encryption and condition access for the Radio Data System - Traffic Message Channel ALERT C coding|