Three year old Books ' 'June 19th page from page 19,' Flow of decryption by B-CAS card ' Among these, EMM is transmitted for each B-CAS ID. First, the encryption of EMM is canceled with Km, the Kw is taken out, the encryption of ECM is canceled with the extracted Kw, the Ks is taken out, and the content of the encryption finally encrypted with this Ks It turns out to be a proper video signal and it is reflected on the TV. ECM is a program for deciphering program information and encrypted programs Scramble key (Ks)The one containing EMM Work key (Kw)It is encrypted and contained. In digital broadcasting, TV programs are sent in an encrypted state, but along with the program data ECM(Entitlement Control Message) and EMM(Entitlement Management Message) has also been sent.
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