Unauthorized Descrambling of a Random Line Inversion Scrambled TV Signal

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Simple techniques for unauthorized descrambling of a random line inversion scrambled television signal are proposed. An analysis of the complexity of the proposed descrambling process is presented and it is shown that high-quality estimates of moderately long encoding sequences can be obtained with reasonable memory and delay. An improvement to the basic scheme which substantially reduces memory requirements with only a slight increase in delay is also evaluated. Finally, it is shown that varying code lengths among a finite number of alternatives does not significantly increase descrambler complexity.

Original languageEnglish (US)
Pages (from-to)816-821
Number of pages6
JournalIEEE Transactions on Communications
Issue number6
StatePublished - Jan 1 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Engineering(all)

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