Conditional Access Mechanisms in the DAB System



The conditional access in the DAB system is a set of procedures responsible for controlling access of authorized categories of recipients to the specific DAB data and services. An access lock is implemented by a controlled distortion of the useful signal in a process called scrambling. Scrambling involves adding the bits of the specified information program with a string of bits from a pseudo-random generator. Reading such a signal in the receiver requires summation with identical re-synchronized pseudo-random sequence. For this purpose, it is necessary to know the activation code of a pseudo-random generator. Code is made available after verifying an authorization to receive scrambled information. Conditional access of the DAB system includes mechanisms allowing to distribute entitlements to specified (purchased) content and services.


Service provider server Multiple network server Broadcast network server Operation and management system 


  1. 1.
    ETSI TS 102 367, “Digital Audio Broadcasting (DAB); Conditional access”,Google Scholar
  2. 2.
    EN 50 094, “Access control system for the MAC/packet family: EUROCRYPT”,Google Scholar

Copyright information

© The Author(s), under exclusive license to Springer Nature Switzerland AG 2022

Authors and Affiliations

  1. 1.National Institute of TelecommunicationsWroclawPoland

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