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Analogue Nagravision (Syster) encoder
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<blockquote data-quote="Captain Jack" data-source="post: 1081786" data-attributes="member: 243342"><p>Here's what I think various bits in msg1[0] byte do. </p><p></p><p>[code] </p><p> b = 0 << 7; /* ?? Unused */</p><p> b |= 0 << 6; /* ?? Unused */</p><p> b |= 1 << 5; /* 0: clear, 1: scrambled */</p><p> b |= 1 << 4; /* Audio inversion frequency: 1: 12.8kHz, 0: ?kHz */</p><p> b |= 0 << 3; /* 0: full frame scrambling, 1: half-frame scrambling */</p><p> b |= 0 << 2; /* Seems to enable cut-and-rotate on some decoders (+ msg2[1] = 0x29) */</p><p> b |= 1 << 1; /* Scrambling type: 0: Discret 11, 1: Syster */</p><p> b |= 0 << 0; /* 6th high bit of audience level */[/code] </p><p></p><p>It's similar to [USER=414304]@homercartman[/USER]'s findings. I am still not able to force the French decoders to use the new permutation table and I don't know how it's controlled. </p><p></p><p>German decoders also have videocrypt-like cut and rotate function. It's unclear yet whether the c/r sequences are affected by card's seed or not (Discret11 isn't). Nor what PRBS function is used but likely to be similar to others'.</p><p></p><p>It's a little different from Videocrypt in that the cut point can be anywhere in the frame. It doesn't seem to be limited to 256 points. Might be wrong though.</p></blockquote><p></p>
[QUOTE="Captain Jack, post: 1081786, member: 243342"] Here's what I think various bits in msg1[0] byte do. [code] b = 0 << 7; /* ?? Unused */ b |= 0 << 6; /* ?? Unused */ b |= 1 << 5; /* 0: clear, 1: scrambled */ b |= 1 << 4; /* Audio inversion frequency: 1: 12.8kHz, 0: ?kHz */ b |= 0 << 3; /* 0: full frame scrambling, 1: half-frame scrambling */ b |= 0 << 2; /* Seems to enable cut-and-rotate on some decoders (+ msg2[1] = 0x29) */ b |= 1 << 1; /* Scrambling type: 0: Discret 11, 1: Syster */ b |= 0 << 0; /* 6th high bit of audience level */[/code] It's similar to [USER=414304]@homercartman[/USER]'s findings. I am still not able to force the French decoders to use the new permutation table and I don't know how it's controlled. German decoders also have videocrypt-like cut and rotate function. It's unclear yet whether the c/r sequences are affected by card's seed or not (Discret11 isn't). Nor what PRBS function is used but likely to be similar to others'. It's a little different from Videocrypt in that the cut point can be anywhere in the frame. It doesn't seem to be limited to 256 points. Might be wrong though. [/QUOTE]
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