VideoCrypt

VideoCrypt is a cryptographic, smartcard-based conditional access television encryption system that scrambles analogue pay-TV signals.

It was introduced in 1989 by News Datacom and was used initially by Sky TV and subsequently by several other broadcasters on SES' Astra satellites at 19.2° east.

The VideoCrypt-S system differed from the typical VideoCrypt implementation as it used line shuffle scrambling.

The system also included a cryptographic element called the Fiat Shamir Zero Knowledge Test.

The VideoCrypt-S variant, used by the BBC Select service, was based on line shuffle scrambling.