{"id":1673,"date":"2012-09-29T11:05:59","date_gmt":"2012-09-29T04:05:59","guid":{"rendered":"http:\/\/snt.com.vn\/blog\/?p=1673"},"modified":"2012-09-29T11:05:59","modified_gmt":"2012-09-29T04:05:59","slug":"h%e1%bb%87-th%e1%bb%91ng-truy-nh%e1%ba%adp-co-di%e1%bb%81u-ki%e1%bb%87n-trong-truy%e1%bb%81n-hinh-s%e1%bb%91","status":"publish","type":"post","link":"https:\/\/snt.com.vn\/blog\/h%e1%bb%87-th%e1%bb%91ng-truy-nh%e1%ba%adp-co-di%e1%bb%81u-ki%e1%bb%87n-trong-truy%e1%bb%81n-hinh-s%e1%bb%91\/","title":{"rendered":"H\u1ec7 th\u1ed1ng truy nh\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n trong truy\u1ec1n h\u00ecnh s\u1ed1"},"content":{"rendered":"


\n <\/span><\/strong>\"\"<\/p>\n


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H\u1ec7 th\u1ed1ng truy nh\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n CA (Conditional Access) \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c ph\u00e2n ph\u1ed1i c\u00e1c d\u1ecbch v\u1ee5 truy\u1ec1n h\u00ecnh tr\u1ea3 ti\u1ec1n. M\u1ee5c \u0111\u00edch ch\u00ednh c\u1ee7a h\u1ec7 th\u1ed1ng n\u00e0y l\u00e0 cung c\u1ea5p m\u1ed9t c\u01a1 ch\u1ebf ki\u1ec3m tra \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00e1ch h\u00e0ng truy c\u1eadp \u0111\u00fang n\u1ed9i dung \u0111\u00e3 \u0111\u01b0\u1ee3c tr\u1ea3 ti\u1ec1n. B\u00e0i b\u00e1o tr\u00ecnh b\u00e0y t\u1ed5ng quan v\u1ec1 m\u1ed9t h\u1ec7 th\u1ed1ng truy c\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n h\u00ecnh s\u1ed1, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong truy\u1ec1n h\u00ecnh di \u0111\u1ed9ng.<\/span><\/em><\/p>\n

<\/em><\/p>\n

-M\u1ed9t s\u1ed1 th\u00f4ng tin v\u1ec1 th\u1ebb CAM c\u1ee7a SNT:<\/span><\/em><\/p>\n<\/h1>\n

<\/em>http:\/\/truyenhinhso.biz.vn\/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=30&category_id=31&option=com_virtuemart&Itemid=87
\n <\/a>http:\/\/truyenhinhso.biz.vn\/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=29&category_id=31&option=com_virtuemart&Itemid=87
\n <\/a>http:\/\/truyenhinhso.biz.vn\/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=28&category_id=31&option=com_virtuemart&Itemid=87#<\/a>
\n <\/span><\/h1>\n

1. Gi\u1edbi thi\u1ec7u<\/span>
\n <\/span>Qu\u00e1 tr\u00ecnh truy\u1ec1n n\u1ed9i dung c\u1ee7a c\u00e1c k\u00eanh ch\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n h\u00ecnh s\u1ed1 qua m\u1ea1ng vi\u1ec5n th\u00f4ng hay m\u1ea1ng qu\u1ea3ng b\u00e1 g\u1ed3m 3 giai \u0111o\u1ea1n:
\n <\/span>– T\u1eebng ch\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n h\u00ecnh \u0111\u01b0\u1ee3c s\u1ed1 h\u00f3a (hi\u1ec7n nay ph\u1ed5 bi\u1ebfn s\u1eed d\u1ee5ng MPEG-4). C\u00e1c n\u1ed9i dung s\u1ed1 n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u1eadt m\u00e3 h\u00f3a, nh\u1eb1m b\u1ea3o v\u1ec7 quy\u1ec1n s\u1edf h\u1eefu n\u1ed9i dung c\u1ee7a nh\u00e0 cung c\u1ea5p n\u1ed9i dung (b\u1eb1ng DRM) ho\u1eb7c kh\u00f4ng \u0111\u01b0\u1ee3c m\u1eadt m\u00e3 h\u00f3a (n\u1ed9i dung kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7).
\n <\/span>– C\u00e1c n\u1ed9i dung s\u1ed1 c\u1ee7a c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh \u0111\u01b0\u1ee3c gh\u00e9p v\u1edbi nhau th\u00e0nh m\u1ed9t lu\u1ed3ng s\u1ed1 chung (S\u1eed d\u1ee5ng MPEG-2). C\u00e1c n\u1ed9i dung s\u1ed1 n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u1eadt m\u00e3 h\u00f3a tr\u01b0\u1edbc (cho t\u1eebng k\u00eanh) ho\u1eb7c sau khi gh\u00e9p lu\u1ed3ng s\u1ebd \u0111\u01b0\u1ee3c m\u1eadt m\u00e3 h\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ec9 c\u00e1c thu\u00ea bao \u0111\u01b0\u1ee3c ph\u00e9p m\u1edbi c\u00f3 th\u1ec3 xem \u0111\u01b0\u1ee3c c\u00e1c n\u1ed9i dung n\u00e0y.\u00a0\u0110\u00e2y l\u00e0 giai \u0111o\u1ea1n b\u1ea3o v\u1ec7 n\u1ed9i dung truy\u1ec1n h\u00ecnh s\u1ed1 b\u1eb1ng truy c\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n (CA).
\n <\/em><\/span>– <\/em>Truy\u1ec1n\u00a0c<\/em>\u00e1c lu\u1ed3ng s\u1ed1 \u0111\u00e3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a qua m\u1ea1ng vi\u1ec5n th\u00f4ng ho\u1eb7c qu\u1ea3ng b\u00e1:
\n <\/span>C\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 nh\u01b0 truy\u1ec1n d\u1eabn b\u1eb1ng m\u1ea1ng 3G-s\u1eed d\u1ee5ng an ninh m\u1ea1ng 3G \u0111\u1ec3 b\u1ea3o v\u1ec7 truy c\u1eadp m\u1ea1ng, ho\u1eb7c truy\u1ec1n d\u1eabn qua m\u1ea1ng xDSL c\u0169ng y\u00eau c\u1ea7u x\u00e1c th\u1ef1c
\n <\/span>C\u00f3 th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 nh\u01b0 khi ph\u00e1t qu\u1ea3ng b\u00e1.
\n <\/span> \"\"
\n <\/span> H\u00ecnh <\/strong>1<\/strong><\/em>. T\u1ed5ng quan qu\u00e1 tr\u00ecnh truy\u1ec1n n\u1ed9i dung truy\u1ec1n h\u00ecnh s\u1ed1<\/em>
\n <\/strong><\/span>2. C\u1ea5u tr\u00fac chung cho h\u1ec7 th\u1ed1ng CA
\n <\/span> <\/span>H\u1ec7 th\u1ed1ng truy c\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n s\u1eed d\u1ee5ng s\u1ef1 x\u00e1o tr\u1ed9n v\u00e0 m\u1eadt m\u00e3 \u0111\u1ec3 ng\u0103n ch\u1eb7n truy c\u1eadp kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1eadn d\u1ea1ng, \u0111\u1ec3 b\u1ea3o v\u1ec7 n\u1ed9i dung v\u00e0 d\u1ecbch v\u1ee5. S\u1ef1 x\u00e1o tr\u1ed9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00edn hi\u1ec7u ch\u01b0\u01a1ng tr\u00ecnh v\u1edbi m\u1ed9t thu\u1eadt to\u00e1n x\u00e1c \u0111\u1ecbnh, nh\u01b0 l\u00e0 thu\u1eadt to\u00e1n x\u00e1o tr\u1ed9n chung CSA (Common Scrambling Algorithm). Th\u1ef1c t\u1ebf, thu\u1eadt to\u00e1n x\u00e1o tr\u1ed9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u1ea7u h\u1ebft c\u00e1c h\u1ec7 th\u1ed1ng qu\u1ea3ng b\u00e1 s\u1ed1 CA hi\u1ec7n nay tr\u00ean to\u00e0n th\u1ebf gi\u1edbi, trong khi m\u1eadt m\u00e3 \u1edf \u0111\u00e2y h\u01b0\u1edbng v\u00e0o vi\u1ec7c b\u1ea3o v\u1ec7 kh\u00f3a x\u00e1o tr\u1ed9n th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0\u00a0kho\u00e1 \u0111i\u1ec1u khi\u1ec3n <\/em>CW (Control Word), nh\u1eb1m cho ph\u00e9p x\u00e1o tr\u1ed9n \u1edf m\u00e1y ph\u00e1t v\u00e0 gi\u1ea3i x\u00e1o tr\u1ed9n \u1edf m\u00e1y thu. Do \u0111\u00f3 qu\u1ea3n l\u00fd kh\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o CW \u0111\u01b0\u1ee3c trao m\u1ed9t c\u00e1c an to\u00e0n cho \u0111\u00fang ng\u01b0\u1eddi s\u1eed d\u1ee5ng \u0111\u00e3 \u0111\u01b0\u1ee3c nh\u1eadn d\u1ea1ng, l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 c\u1ea7n thi\u1ebft trong m\u1ed9t h\u1ec7 th\u1ed1ng CA.
\n <\/span> \"\"
\n <\/span> H\u00ecnh <\/strong>2<\/strong><\/em>. C\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng CA DVB chung<\/em>
\n <\/strong><\/span>H\u00ecnh\u00a02\u00a0\u0111\u01b0a ra m\u00f4 h\u00ecnh t\u1ed5ng th\u1ec3 m\u1ed9t h\u1ec7 th\u1ed1ng CA cho truy\u1ec1n h\u00ecnh s\u1ed1 n\u00f3i chung. M\u1ed9t h\u1ec7 th\u1ed1ng CA bao g\u1ed3m 5 th\u00e0nh ph\u1ea7n quan tr\u1ecdng:
\n <\/span> * \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd thu\u00ea bao SMS,
\n <\/span> *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0H\u1ec7 th\u1ed1ng x\u00e1c th\u1ef1c thu\u00ea bao (SAS),
\n <\/span> * \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0B\u1ed9 x\u00e1o tr\u1ed9n,
\n <\/span> * \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0B\u1ed9 gi\u1ea3i x\u00e1o tr\u1ed9n
\n <\/span><\/em> * \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0v\u00e0 th\u1ebb th\u00f4ng minh.<\/em>
\n <\/span>Ba th\u00e0nh ph\u1ea7n \u0111\u1ea7u l\u00e0 \u1edf b\u00ean m\u00e1y ph\u00e1t c\u00f2n 2 th\u00e0nh ph\u1ea7n sau l\u00e0 tr\u00ean m\u00e1y thu (th\u01b0\u1eddng l\u00e0 set-top-box).
\n <\/span>H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd thu\u00ea bao (SMS – Subscriber Management System )
\n <\/span><\/em><\/strong>SMS l\u00e0 m\u1ed9t trung t\u00e2m kinh doanh, n\u00f3 \u201cph\u00e1t h\u00e0nh th\u1ebb th\u00f4ng minh, g\u1eedi h\u00f3a \u0111\u01a1n v\u00e0 nh\u1eadn ti\u1ec1n tr\u1ea3 t\u1eeb thu\u00ea bao\u201d. M\u1ed9t t\u00e0i nguy\u00ean quan tr\u1ecdng c\u1ee7a SMS l\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1ch h\u00e0ng, bao g\u1ed3m th\u00f4ng tin nh\u1ea1y c\u1ea3m cao trong kinh doanh, nh\u01b0 l\u00e0 th\u00f4ng tin c\u00e1 nh\u00e2n v\u1ec1 thu\u00ea bao, nh\u1eefng s\u1ed1 seri c\u1ee7a c\u00e1c set-top box v\u00e0 th\u00f4ng tin v\u1ec1 c\u00e1c d\u1ecbch v\u1ee5, t\u1eeb \u0111\u00f3 NSD \u0111\u1eb7t h\u00e0ng. \u0110\u1ea7u ti\u00ean, c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 qu\u1ea3n l\u00fd quy\u1ec1n truy c\u1eadp c\u1ee7a thu\u00ea bao v\u00e0 b\u1ea3o v\u1ec7 c\u00e1c n\u1ed9i dung v\u00e0 c\u00e1c d\u1ecbch v\u1ee5. N\u1ebfu ng\u01b0\u1eddi v\u1eadn h\u00e0nh d\u1ecbch v\u1ee5 c\u1ea7n thay \u0111\u1ed5i th\u00f4ng tin c\u1ee7a kh\u00e1ch h\u00e0ng, c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1ebd c\u1eadp nh\u1eadt b\u1eb1ng c\u00e1ch th\u00eam v\u00e0o c\u00e1c tham s\u1ed1 v\u1edbi \u00fd \u0111\u1ecbnh thay \u0111\u1ed5i quy\u1ec1n truy c\u1eadp c\u1ee7a thu\u00ea bao \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c d\u1ecbch v\u1ee5 v\u00e0 c\u00e1c n\u1ed9i dung. V\u00e0 SMS s\u1ebd g\u1eedi m\u1ed9t y\u00eau c\u1ea7u c\u1eadp nh\u1eadt v\u1edbi th\u00f4ng tin m\u1edbi t\u1edbi SAS.
\n <\/span>H\u1ec7 th\u1ed1ng nh\u1eadn d\u1ea1ng thu\u00ea bao (SAS – Subscriber Authorization System)
\n <\/span><\/em><\/strong>H\u1ec7 th\u1ed1ng nh\u1eadn d\u1ea1ng thu\u00ea bao c\u00f3 tr\u00e1ch nhi\u1ec7m t\u1ea1o, t\u1ed5 ch\u1ee9c v\u00e0 ph\u00e2n ph\u1ed1i lu\u1ed3ng d\u1eef li\u1ec7u \u0111i\u1ec1u khi\u1ec3n, v\u00ed d\u1ee5 b\u1ea3n tin qu\u1ea3n l\u00fd quy\u1ec1n h\u1ea1n EMM (Entitlement Management Message) v\u00e0 b\u1ea3n tin \u0111i\u1ec1u khi\u1ec3n quy\u1ec1n h\u1ea1n ECM (Entitlement Control Message), d\u1ef1a tr\u00ean SMS. M\u1ed9t EMM l\u00e0 m\u1ed9t b\u1ea3n tin nh\u1eadn d\u1ea1ng m\u1ed9t ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 gi\u1ea3i x\u00e1o tr\u1ed9n m\u1ed9t d\u1ecbch v\u1ee5, trong khi ECM l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u m\u1eadt m\u00e3 c\u1ee7a kho\u00e1 \u0111i\u1ec1u khi\u1ec3n v\u00e0 th\u00f4ng tin v\u1ec1 quy\u1ec1n h\u1ea1n.
\n <\/span>B\u1ed9 x\u00e1o tr\u1ed9n<\/em><\/span>
\n <\/span><\/em><\/strong>Thi\u1ebft b\u1ecb n\u00e0y s\u1eed d\u1ee5ng m\u1ed9t thu\u1eadt to\u00e1n m\u1ea1nh \u0111\u1ec3 x\u00e1o tr\u1ed9n n\u1ed9i dung (hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 lu\u1ed3ng truy\u1ec1n t\u1ea3i TS-Transport Stream). Trong h\u1ec7 th\u1ed1ng DVB, b\u1ed9 x\u00e1o tr\u1ed9n s\u1eed d\u1ee5ng CSA \u0111\u1ec3 x\u00e1o tr\u1ed9n.
\n <\/span>B\u1ed9 gi\u1ea3i x\u00e1o tr\u1ed9n<\/span>
\n <\/span><\/em><\/strong>Thi\u1ebft b\u1ecb n\u00e0y c\u0169ng s\u1eed d\u1ee5ng m\u1ed9t thu\u1eadt to\u00e1n m\u1ea1nh \u0111\u1ec3 gi\u1ea3i x\u00e1o tr\u1ed9n lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1o tr\u1ed9n. Trong h\u1ec7 th\u1ed1ng DVB, b\u1ed9 gi\u1ea3i x\u00e1o tr\u1ed9n s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng gi\u1ea3i x\u00e1o tr\u1ed9n (CDS) chung \u0111\u1ec3 gi\u1ea3i x\u00e1o tr\u1ed9n.
\n <\/span>Th\u1ebb th\u00f4ng minh<\/span>
\n <\/span><\/em><\/strong>Th\u1ebb th\u00f4ng minh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 \u201cm\u1ed9t d\u1ea5u hi\u1ec7u c\u1ee7a quy\u1ec1n h\u1ea1n \u0111\u1ec3 gi\u1ea3i x\u00e1o tr\u1ed9n c\u00e1c t\u00edn hi\u1ec7u qu\u1ea3ng b\u00e1\u201d. SMS ph\u00e1t h\u00e0nh th\u1ebb th\u00f4ng minh v\u00e0 x\u00e1c nh\u1eadn t\u00ednh h\u1ee3p l\u1ec7 th\u00f4ng qua vi\u1ec7c l\u1eadp tr\u00ecnh ch\u00fang tr\u01b0\u1edbc v\u1edbi c\u00e1c kh\u00f3a \u0111\u1ec3 nh\u1eadn d\u1ea1ng truy c\u1eadp t\u1edbi c\u00e1c n\u1ed9i dung ch\u01b0\u01a1ng tr\u00ecnh hay c\u00e1c d\u1ecbch v\u1ee5, ho\u1eb7c c\u1ea3 hai.
\n <\/span>2.1.\u00a0\u00a0X\u00e1o tr\u1ed9n v\u00e0 gi\u1ea3i x\u00e1o tr\u1ed9n<\/span>
\n <\/span>M\u1ed9t TS \u0111\u01b0\u1ee3c m\u1eadt m\u00e3 b\u1edfi b\u1ed9 x\u00e1o tr\u1ed9n v\u1edbi m\u1ed9t thu\u1eadt to\u00e1n \u0111\u1ee7 m\u1ea1nh, nh\u1eb1m gi\u1ea3m t\u1ed1i thi\u1ec3u kh\u1ea3 n\u0103ng t\u1ea5n c\u00f4ng c\u1ee7a tin t\u1eb7c. B\u1ed9 x\u00e1o tr\u1ed9n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t CW nh\u01b0 l\u00e0 m\u1ed9t ch\u00eca kh\u00f3a m\u1eadt m\u00e3, ho\u1eb7c \u0111\u01b0\u1ee3c t\u1ea1o b\u1edfi m\u1ed9t CW \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1eb7t cho tr\u1ea1ng th\u00e1i \u0111\u1ea7u c\u1ee7a b\u1ed9 t\u1ea1o m\u00e3 gi\u1ea3 ng\u1eabu nhi\u00ean \u0111\u1ec3 n\u00f3 \u0111\u01b0a ra m\u1ed9t kho\u00e1 m\u1eadt m\u00e3. \u0110\u1ea7u ra c\u1ee7a b\u1ed9 tr\u1ed9n \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i \u0111\u1ebfn NSD qua m\u1ea1ng qu\u1ea3ng b\u00e1. CW \u0111\u01b0\u1ee3c l\u1ea5y l\u1ea1i t\u1eeb TS \u0111\u00e3 b\u1ecb tr\u1ed9n v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 tr\u1ea3 l\u1ea1i n\u1ed9i dung g\u1ed1c v\u1edbi thu\u1eadt to\u00e1n gi\u1ea3i x\u00e1o tr\u1ed9n t\u01b0\u01a1ng \u1ee9ng.
\n <\/span>T\u1ed5 ch\u1ee9c DVB ch\u00e2u \u00c2u \u0111\u00e3 ph\u00e1t tri\u1ec3n m\u1ed9t chu\u1ea9n cho x\u00e1o tr\u1ed9n v\u00e0 gi\u1ea3i x\u00e1o tr\u1ed9n, v\u00ed d\u1ee5 nh\u01b0 CSA:
\n <\/span>– CSA bao g\u1ed3m hai ph\u1ea7n: h\u1ec7 th\u1ed1ng gi\u1ea3i x\u00e1o tr\u1ed9n (CDS) v\u00e0 c\u00f4ng ngh\u1ec7 x\u00e1o tr\u1ed9n (ST), c\u00f3 nh\u1eefng gi\u1ea5y ph\u00e9p ph\u00e2n ph\u1ed1i ri\u00eang \u0111\u1ec3 s\u1eed d\u1ee5ng y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt cho t\u1eebng ph\u1ea7n.
\n <\/span>– ETSI qu\u1ea3n l\u00fd b\u1ed1n c\u00f4ng ty ph\u00e1t tri\u1ec3n CSA. C\u00e1c h\u00e3ng s\u1ea3n xu\u1ea5t STB s\u1ebd tr\u1ea3 ti\u1ec1n gi\u1ea5y ph\u00e9p c\u00f4ng ngh\u1ec7 x\u00e1o tr\u1ed9n v\u00e0 ti\u1ebfp t\u1ee5c tr\u1ea3 ti\u1ec1n gi\u1ea5y ph\u00e9p con cho nh\u1eefng ng\u01b0\u1eddi mua b\u1ed9 x\u00e1o tr\u1ed9n.
\n <\/span>2.2. H\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p kho\u00e1<\/span>
\n <\/span>N\u00f3i chung, m\u1ed9t h\u1ec7 th\u1ed1ng CA s\u1eed d\u1ee5ng h\u1ec7 ph\u00e2n c\u1ea5p kho\u00e1 ba l\u1edbp nh\u01b0 \u0111\u01b0\u1ee3c ch\u1ec9 ra trong. CW thay \u0111\u1ed5i ng\u1eabu nhi\u00ean l\u00e0 l\u1edbp d\u01b0\u1edbi c\u00f9ng trong h\u1ec7 ph\u00e2n c\u1ea5p kho\u00e1. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 h\u1ea1t gi\u1ed1ng c\u1ee7a b\u1ed9 t\u1ea1o m\u00e3 gi\u1ea3 ng\u1eabu nhi\u00ean PRG (Pseudo Random Generator) \u0111\u1ec3 t\u1ea1o ra m\u1ed9t chu\u1ed7i gi\u1ea3 ng\u1eabu nhi\u00ean, chu\u1ed7i n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 x\u00e1o tr\u1ed9n TS. CW l\u00e0 m\u1ed9t kho\u00e1 b\u00ed m\u1eadt, h\u1ea7u h\u1ebft h\u1ec7 th\u1ed1ng truy\u1ec1n h\u00ecnh tr\u1ea3 ti\u1ec1n s\u1eed d\u1ee5ng m\u1eadt m\u00e3 \u0111\u1ed1i x\u1ee9ng, t\u1ee9c l\u00e0 CW v\u1eeba l\u00e0 kho\u00e1 x\u00e1o tr\u1ed9n v\u1eeba l\u00e0 kho\u00e1 gi\u1ea3i x\u00e1o tr\u1ed9n. Xem x\u00e9t \u0111\u1ebfn t\u00ednh b\u1ea3o m\u1eadt th\u00ec CW n\u00ean \u0111\u01b0\u1ee3c l\u00e0m m\u1edbi trong kho\u1ea3ng 5 \u0111\u1ebfn 20 gi\u00e2y. S\u1ef1 li\u00ean k\u1ebft c\u00e1c l\u1edbp c\u1ee7a h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p kho\u00e1 l\u00e0 s\u1eed d\u1ee5ng m\u1ed9t kho\u00e1 nh\u1eadn d\u1ea1ng AK (Authorization Key) \u0111\u1ec3 m\u1eadt m\u00e3 CW v\u00e0 sau \u0111\u00f3 t\u1ea1o ra ECM. Kho\u00e1 nh\u1eadn d\u1ea1ng AK l\u00e0 duy nh\u1ea5t cho t\u1eebng k\u00eanh v\u00e0 \u0111\u00f4i khi \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ch\u00eca kh\u00f3a d\u1ecbch v\u1ee5 cho nh\u00e0 cung c\u1ea5p CA. N\u00f3 th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt m\u1ed7i chu k\u1ef3 n\u1ea1p ti\u1ec1n, \u0111i\u1ec1u \u0111\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o ch\u00ednh s\u00e1ch d\u1ecbch v\u1ee5 n\u1ea1p ti\u1ec1n c\u1ee7a nh\u00e0 kinh doanh, c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t tu\u1ea7n hay m\u1ed9t th\u00e1ng. M\u1ed7i khi CW \u0111\u01b0\u1ee3c l\u00e0m m\u1edbi, ch\u1ec9 ph\u00e1t qu\u1ea3ng b\u00e1 m\u1ed9t ECM duy nh\u1ea5t, do \u0111\u00f3 gi\u00fap ti\u1ebft ki\u1ec7m b\u0103ng th\u00f4ng hi\u1ec7u qu\u1ea3 v\u00e0 gi\u1ea3m t\u1ea3i trao \u0111\u1ed5i v\u1edbi h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p kho\u00e1 hai l\u1edbp. L\u1edbp tr\u00ean c\u00f9ng s\u1eed d\u1ee5ng kho\u00e1 ri\u00eang ch\u00ednh MPK (Master Private Key) \u0111\u1ec3 m\u1eadt m\u00e3 AK c\u00f9ng v\u1edbi th\u00f4ng tin quy\u1ec1n truy c\u1eadp kh\u00e1c.
\n <\/span>\u0110o\u1ea1n m\u1eadt m\u00e3 \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra l\u00e0 EMM. MPK l\u00e0 duy nh\u1ea5t cho m\u1ed7i thu\u00ea bao. N\u00f3 \u0111\u01b0\u1ee3c l\u01b0u trong m\u1ed9t th\u1ebb th\u00f4ng minh, th\u1ebb n\u00e0y \u0111\u01b0\u1ee3c SMS ph\u00e1t h\u00e0nh \u0111\u1ea3m b\u1ea3o an ninh.
\n <\/span> \"\"
\n <\/span> H\u00ecnh <\/strong>3<\/strong><\/span>. C\u1ea5u tr\u00fac ba t\u1ea7ng kho\u00e1<\/span>
\n <\/strong><\/span>ECM, EMM v\u00e0 TS \u0111\u00e3 x\u00e1o tr\u1ed9n s\u1ebd \u0111\u01b0\u1ee3c gh\u00e9p v\u00e0o m\u1ed9t TS m\u1edbi v\u00e0 ph\u00e2n ph\u1ed1i t\u1edbi thu\u00ea bao qua k\u00eanh qu\u1ea3ng b\u00e1. M\u00e1y thu s\u1ebd ch\u00e8n th\u1ebb nh\u1edb v\u00e0o STB, gi\u1ea3i m\u00e3 EMM r\u1ed3i \u0111\u1ebfn ECM, v\u00e0 cu\u1ed1i c\u00f9ng nh\u1eadn l\u1ea1i CW \u0111\u1ec3 gi\u1ea3i x\u00e1o tr\u1ed9n TS \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ea3o m\u1eadt. C\u1ea7n ch\u00fa \u00fd r\u1eb1ng ph\u00eda m\u00e1y thu ph\u1ea3i s\u1eed d\u1ee5ng PRG gi\u1ed1ng v\u1edbi chu\u1ed7i gi\u1ea3 ng\u1eabu nhi\u00ean \u1edf m\u00e1y ph\u00e1t \u0111\u1ec3 gi\u1ea3i x\u00e1o tr\u1ed9n.
\n <\/span>2.3 So s\u00e1nh m\u1eadt m\u00e3 ho\u00e1 d\u1ef1a tr\u00ean thu\u1eadt to\u00e1n v\u00e0 d\u1ef1a tr\u00ean kho\u00e1<\/span>
\n <\/span>Ph\u1ea7n n\u00e0y s\u1ebd th\u1ea3o lu\u1eadn nh\u1eefng \u0111\u1eb7c t\u00ednh c\u01a1 b\u1ea3n ch\u00ednh kh\u00e1c bi\u1ec7t c\u00e1c h\u1ec7 th\u1ed1ng CA. Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u1edf tr\u00ean, ECM v\u00e0 EMM \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy\u1ec1n t\u1ea3i th\u00f4ng tin v\u1ec1 CW v\u00e0 quy\u1ec1n m\u00e0 c\u00e1c thu\u00ea bao \u0111\u01b0\u1ee3c ph\u00e9p c\u00f3 th\u1ec3 nh\u1eadn CW v\u00e0 nh\u1eefng ch\u01b0\u01a1ng tr\u00ecnh \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7. C\u00f3 hai ph\u01b0\u01a1ng th\u1ee9c m\u1eadt m\u00e3 ho\u00e1 \u0111\u1ec3 t\u1ea1o CW cho thu\u00ea bao l\u00e0:
\n <\/span>*\u00a0\u00a0\u00a0\u00a0C\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u1eadt m\u00e3 ho\u00e1 d\u1ef1a tr\u00ean thu\u1eadt to\u00e1n
\n <\/span>* \u00a0 \u00a0V\u00e0 m\u1eadt m\u00e3 kho\u00e1 d\u1ef1a tr\u00ean kho\u00e1.
\n <\/span>Trong ph\u01b0\u01a1ng th\u1ee9c d\u1ef1a tr\u00ean thu\u1eadt to\u00e1n, EMM ch\u1ee9a tham s\u1ed1 d\u1ecbch v\u1ee5, n\u00f3 l\u00e0 k\u00fd hi\u1ec7u duy nh\u1ea5t, thay cho c\u1ea3 kho\u00e1 d\u1ecbch v\u1ee5 hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 AK trong h\u1ec7 th\u1ed1ng CA m\u1eadt m\u00e3 ho\u00e1 d\u1ef1a tr\u00ean kho\u00e1. M\u1ed7i th\u1ebb th\u00f4ng minh ch\u1ee9a c\u00e1c thu\u1eadt to\u00e1n kh\u00e1c nhau. M\u1ed9t d\u00f9ng \u0111\u1ec3 gi\u1ea3i m\u00e3 CW, nh\u1eefng thu\u1eadt to\u00e1n kh\u00e1c s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 d\u1ef1 ph\u00f2ng trong tr\u01b0\u1eddng h\u1ee3p b\u1ecb \u0103n tr\u1ed9m. ECM ch\u1ee9a m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh m\u00f4 t\u1ea3 cho vi\u1ec7c ki\u1ec3m tra quy\u1ec1n truy c\u1eadp. Th\u1ebb th\u00f4ng minh s\u1ebd so s\u00e1nh th\u00f4ng tin quy\u1ec1n truy c\u1eadp b\u00ean trong n\u00f3 v\u1edbi th\u00f4ng tin ch\u1ee9a trong ECM v\u00e0 EMM. N\u1ebfu th\u1ea9m tra th\u00e0nh c\u00f4ng, thu\u1eadt to\u00e1n \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf trong SMC s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o \u0111\u1ec3 gi\u1ea3i m\u00e3 CW c\u1ea7n thi\u1ebft cho vi\u1ec7c gi\u1ea3i x\u00e1o tr\u1ed9n.
\n <\/span>Trong ph\u01b0\u01a1ng th\u1ee9c d\u1ef1a tr\u00ean kho\u00e1, m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p kho\u00e1 s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0 h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p kho\u00e1 3 m\u1ee9c \u0111\u00e3 ch\u1ec9 ra trong ph\u1ea7n tr\u01b0\u1edbc.
\n <\/span>Trong ph\u01b0\u01a1ng ph\u00e1p d\u1ef1a tr\u00ean thu\u1eadt to\u00e1n, c\u00e1c thu\u1eadt to\u00e1n \u0111\u01b0\u1ee3c l\u01b0u trong th\u1ebb th\u00f4ng minh l\u00e0 b\u00ed m\u1eadt ch\u00ednh. Khi thu\u1eadt to\u00e1n t\u1ea1o WC b\u1ecb x\u00e2m h\u1ea1i, h\u1ec7 th\u1ed1ng b\u1ecb r\u1ea1n n\u1ee9t. \u0110\u1ed1i v\u1edbi ph\u01b0\u01a1ng ph\u00e1p d\u1ef1a tr\u00ean kho\u00e1, t\u00ednh b\u1ea3o m\u1eadt ph\u1ee5 thu\u1ed9c v\u00e0o \u0111\u1ed9 tin c\u1eady c\u1ee7a kho\u00e1, v\u00ec v\u1eady vi\u1ec7c l\u00e0m m\u1edbi c\u00e1c kho\u00e1 (CW, AK, MPK) trong m\u1ed9t th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh l\u00e0 v\u1ea5n \u0111\u1ec1 c\u1ed1t y\u1ebfu.
\n <\/span>Ti\u00eau \u0111\u1ec1 c\u1ee7a EMC v\u00e0 EMM s\u1ebd nh\u1ea1y \u0111\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng l\u1edbn c\u00f3 s\u1ed1 l\u01b0\u1ee3ng thu\u00ea bao l\u1edbn. Ph\u01b0\u01a1ng th\u1ee9c d\u1ef1a tr\u00ean thu\u1eadt to\u00e1n c\u00f3 ti\u00eau \u0111\u1ec1 l\u1edbn h\u01a1n ph\u01b0\u01a1ng th\u1ee9c d\u1ef1a tr\u00ean kho\u00e1. V\u1edbi h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p ba t\u1ea7ng, AK ch\u1ee9a trong EMM s\u1ebd \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i tr\u1ef1c ti\u1ebfp th\u00f4ng qua MPK cho m\u1ed7i thu\u00ea bao m\u1ed7i l\u1ea7n n\u00f3 \u0111\u01b0\u1ee3c l\u00e0m m\u1edbi. Gi\u1ea3 s\u1eed c\u00f3 S thu\u00ea bao v\u00e0 T k\u00eanh truy\u1ec1n, s\u1ebd c\u00f3 x\u1ea5p x\u1ec9 SxT g\u00f3i \u0111\u01b0\u1ee3c m\u1eadt m\u00e3 v\u00e0 truy\u1ec1n \u0111i. \u0110i\u1ec1u n\u00e0y t\u1ed1n nhi\u1ec1u th\u1eddi gian v\u00e0 \u0111\u1eb7c bi\u1ec7t r\u1eafc r\u1ed1i \u0111\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng l\u1edbn. C\u00f3 m\u1ed9t v\u00e0i ph\u01b0\u01a1ng th\u1ee9c m\u1eadt m\u00e3 ho\u00e1 qu\u1ea3ng b\u00e1 \u0111\u1ec3 gi\u1ea3m b\u1edbt t\u1ea3i tr\u1ecdng cho m\u1ecdi l\u1ea7n l\u00e0m m\u1edbi v\u00e0 truy\u1ec1n l\u1ea1i c\u1ee7a AK.
\n <\/span>3. Kh\u1ea3 n\u0103ng li\u00ean k\u1ebft CA<\/span>
\n <\/span>An ninh c\u1ee7a h\u1ec7 th\u1ed1ng CA ph\u1ee5 thu\u1ed9c ch\u1ee7 y\u1ebfu v\u00e0o b\u00ed m\u1eadt c\u1ee7a c\u01a1 ch\u1ebf s\u1edf h\u1eefu c\u1ee7a ng\u01b0\u1eddi b\u00e1n h\u00e0ng \u0111\u1ec3 ph\u00e2n ph\u1ed1i CW, li\u00ean quan \u0111\u1ebfn quy\u1ec1n s\u1edf h\u1eefu tr\u00ed tu\u1ec7 c\u1ee7a ng\u01b0\u1eddi b\u00e1n h\u00e0ng, do \u0111\u00f3 li\u00ean k\u1ebft c\u00e1c h\u1ec7 th\u1ed1ng CA nh\u01b0 th\u1ebf n\u00e0o.
\n <\/span>3.1 M\u1eadt m\u00e3 \u0111\u1ed3ng th\u1eddi-SimulCrypt<\/span>
\n <\/span>SimulCrypt l\u00e0m cho n\u00f3 c\u00f3 th\u1ec3 mang nhi\u1ec1u b\u1ea3n tin m\u1ed9t l\u00fac, c\u00e1c b\u1ea3n tin \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi c\u00e1c h\u1ec7 th\u1ed1ng CA kh\u00e1c nhau, nh\u01b0ng t\u1ea5t c\u1ea3 c\u00f9ng cho ph\u00e9p \u0111i\u1ec1u khi\u1ec3n n\u1ed9i dung MPEG \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1o tr\u1ed9n. \u0110\u1ec3 m\u00e3 h\u00f3a \u0111\u1ed3ng th\u1eddi c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c th\u00ec n\u1ed9i dung MPEG \u0111\u01b0\u1ee3c x\u00e1o tr\u1ed9n b\u1eb1ng thu\u1eadt to\u00e1n x\u00e1o tr\u1ed9n chung v\u1edbi kho\u00e1 chung. M\u1ed7i h\u1ec7 th\u1ed1ng CA t\u1ea1o ra nh\u1eefng b\u1ea3n tin \u0111i\u1ec1u khi\u1ec3n c\u1ee7a ri\u00eang n\u00f3 (ECM v\u00e0 EMM) d\u1ef1a theo \u0111\u1ecbnh d\u1ea1ng b\u1ea3n tin \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi DVB. N\u1ed9i dung x\u00e1o tr\u1ed9n v\u00e0 b\u1ea3n tin CA c\u1ee7a m\u1ed7i h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c gh\u00e9p k\u00eanh v\u00e0o m\u1ed9t lu\u1ed3ng MPEG-TS v\u00e0 qu\u1ea3ng b\u00e1 t\u1edbi STB. STB l\u1ecdc ra c\u00e1c b\u1ea3n tin ri\u00eang, \u0111\u1ec3 t\u00e1i t\u1ea1o kho\u00e1 m\u00e3 h\u00f3a chung r\u1ed3i gi\u1ea3i x\u00e1o tr\u1ed9n n\u1ed9i dung.
\n <\/span>3.2 \u0110a m\u1eadt m\u00e3-MultiCrypt<\/span>
\n <\/span>M\u00e3 h\u00f3a nhi\u1ec1u m\u00e3 cho ph\u00e9p ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ed9t STB v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng CA kh\u00e1c nhau qua giao di\u1ec7n chung CI (Common Interface). Giao di\u1ec7n chung n\u00e0y l\u00e0 m\u1ed9t giao di\u1ec7n chu\u1ea9n \u0111\u1ec3 k\u1ebft n\u1ed1i m\u1ed9t STB v\u1edbi m\u1ed9t modul c\u00f3 th\u1ec3 t\u00e1ch r\u1eddi ra \u0111\u01b0\u1ee3c (m\u1ed9t modul PCMCIA chung). Modul PCMCIA th\u1ef1c hi\u1ec7n c\u00e1c ch\u1ee9c n\u0103ng ri\u00eang \u0111\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng CA li\u00ean quan. \u0110\u1ec3 xem ch\u01b0\u01a1ng tr\u00ecnh \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a b\u1edfi c\u00e1c h\u1ec7 th\u1ed1ng CA kh\u00e1c m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t tr\u00ean STB, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 chuy\u1ec3n k\u00eanh c\u00e1c modul b\u1eb1ng tay.
\n <\/span>3.3 So s\u00e1nh<\/span>
\n <\/span>S\u1eed d\u1ee5ng SimulCrypt \u0111\u00f2i h\u1ecfi c\u1ea7n ph\u1ea3i c\u00f3 nh\u1eefng th\u1ecfa thu\u1eadn v\u1ec1 l\u1ee3i \u00edch gi\u1eefa c\u00e1c nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 \u0111\u1ec3 li\u00ean k\u1ebft c\u00e1c h\u1ec7 th\u1ed1ng CA l\u1ea1i v\u1edbi nhau, nh\u01b0 l\u00e0 trao \u0111\u1ed5i c\u00e1c b\u1ea3n tin CA. M\u1ed9t nh\u01b0\u1ee3c \u0111i\u1ec3m kh\u00e1c c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 t\u0103ng m\u1ee9c s\u1eed d\u1ee5ng b\u0103ng th\u00f4ng, do b\u1ea3n tin CA \u0111\u01b0\u1ee3c sao ch\u00e9p cho m\u1ecdi h\u1ec7 th\u1ed1ng CA v\u00e0 trao \u0111\u1ed5i gi\u1eefa c\u00e1c h\u1ec7 th\u1ed1ng. \u0110i\u1ec1u \u0111\u00f3 c\u0169ng l\u00e0m n\u1ea3y sinh th\u00eam nhi\u1ec1u v\u1ea5n \u0111\u1ec1 kh\u00e1c. V\u00ed d\u1ee5 nh\u01b0 c\u1ea7n th\u00eam m\u1ed9t b\u1ed9 \u0111\u1ed3ng b\u1ed9 SimulCrypt \u0111\u1ec3 gi\u1ea3m t\u1ed1i thi\u1ec3u xung \u0111\u1ed9t tr\u00ean b\u1ea5t k\u1ef3 th\u00e0nh ph\u1ea7n n\u00e0o c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng CA v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n vi\u1ec7c t\u1ea1o, t\u1eadp h\u1ee3p v\u00e0 \u0111\u01b0a ra c\u00e1c ECM t\u1eeb nhi\u1ec1u h\u1ec7 th\u1ed1ng CA. Ngo\u00e0i ra, v\u1edbi SimulCrypt th\u00ec t\u00ednh b\u1ea3o m\u1eadt c\u1ee7a h\u1ec7 th\u1ed1ng l\u00e0 y\u1ebfu nh\u1ea5t. Tuy nhi\u00ean,\u01b0u \u0111i\u1ec3m ch\u00ednh c\u1ee7a ph\u01b0\u01a1ng th\u1ee9c m\u1eadt m\u00e3 n\u00e0y l\u00e0 kh\u00f4ng t\u1ea1o th\u00eam chi ph\u00ed n\u00e0o cho NSD.
\n <\/span>Nh\u01b0\u1ee3c \u0111i\u1ec3m ch\u00ednh c\u1ee7a MultiCrypt n\u1eb1m trong ph\u1ea7n tr\u1ea3 th\u00eam ti\u1ec1n c\u1ee7a NSD. Trong n\u0103m 2001 m\u1ed9t thi\u1ebft b\u1ecb CI STB \u0111\u01b0\u1ee3c t\u1ea1o ra c\u00f3 gi\u00e1 65USD, \u0111\u1eaft h\u01a1n so v\u1edbi m\u1ed9t thi\u1ebft b\u1ecb STB v\u1edbi m\u1ed9t h\u1ec7 th\u1ed1ng CA \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p, t\u00ednh c\u1ea3 gi\u00e1 cho m\u1ed9t modul CA (60 USD) c\u1ed9ng v\u1edbi gi\u00e1 c\u1ee7a m\u1ed9t giao di\u1ec7n CI STB t\u00edch h\u1ee3p (5 USD). \u0110\u1ec3 xem ch\u01b0\u01a1ng tr\u00ecnh \u0111\u01b0\u1ee3c x\u00e1o tr\u1ed9n b\u1edfi m\u1ed9t h\u1ec7 th\u1ed1ng CA kh\u00e1c kh\u00f4ng \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t trong STB c\u1ea7n ph\u1ea3i th\u00eam v\u00e0o m\u1ed9t m\u00f4 \u0111un CA cho h\u1ec7 th\u1ed1ng CA, v\u1edbi gi\u00e1 trong n\u0103m 2001 x\u1ea5p x\u1ec9 60 USD. M\u1ed9t nh\u01b0\u1ee3c \u0111i\u1ec3m kh\u00e1c l\u00e0 giao di\u1ec7n l\u00e0 c\u1ed1 \u0111\u1ecbnh v\u00e0 kh\u00f4ng linh ho\u1ea1t, \u0111i\u1ec1u \u0111\u00f3 d\u1eabn \u0111\u1ebfn gi\u1edbi h\u1ea1n h\u1ed7 tr\u1ee3 c\u1ee7a c\u00e1c ch\u1ee9c n\u0103ng h\u1ec7 th\u1ed1ng CA. V\u1ec1 ph\u00eda nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5, kh\u00f4ng c\u1ea7n th\u00eam tho\u1ea3 thu\u1eadn th\u01b0\u01a1ng m\u1ea1i hay t\u0103ng th\u00eam chi ph\u00ed.
\n <\/span>4. K\u1ebft lu\u1eadn<\/span>
\n <\/span>B\u00e0i b\u00e1o tr\u00ecnh b\u00e0y t\u1ed5ng quan c\u0169ng nh\u01b0 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a h\u1ec7 th\u1ed1ng truy c\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n-h\u1ec7 th\u1ed1ng an ninh truy\u1ec1n d\u1eabn cho truy\u1ec1n h\u00ecnh s\u1ed1. Tuy nhi\u00ean vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c h\u1ec7 th\u1ed1ng CA hi\u1ec7n nay s\u1ebd g\u00e2y ra kh\u00f3 kh\u0103n cho m\u1ee5c ti\u00eau li\u00ean k\u1ebft v\u00e0 roaming, l\u00e0m cho th\u1ecb tr\u01b0\u1eddng truy\u1ec1n h\u00ecnh s\u1ed1 d\u1ec5 b\u1ecb ph\u00e2n \u0111o\u1ea1n, kh\u00f3 li\u00ean k\u1ebft to\u00e0n c\u1ea7u. Ngo\u00e0i ra h\u1ec7 th\u1ed1ng truy c\u1eadp c\u00f3 \u0111i\u1ec1u ki\u1ec7n m\u1edbi ch\u1ec9 th\u1ecfa m\u00e3n \u0111\u01b0\u1ee3c an ninh cho c\u00e1c nh\u00e0 khai th\u00e1c m\u1ea1ng, nh\u01b0ng ch\u01b0a \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c nhu c\u1ea7u an ninh c\u1ee7a c\u00e1c nh\u00e0 cung c\u1ea5p n\u1ed9i dung. V\u00ec v\u1eady hi\u1ec7n nay c\u00f9ng v\u1edbi s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng CA, trong an ninh n\u1ed9i dung truy\u1ec1n h\u00ecnh s\u1ed1 ng\u01b0\u1eddi ta c\u00f2n s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng ngh\u1ec7 qu\u1ea3n l\u00fd b\u1ea3n quy\u1ec1n s\u1ed1 (DRM).
\n <\/span>T\u00e0i li\u1ec7u tham kh\u1ea3o
\n <\/span>[1]. NGUY\u1ec4N QU\u00dd S\u1ef8, \u0111\u1ec1 t\u00e0i \u201cNghi\u00ean c\u1ee9u c\u00e1c c\u00f4ng ngh\u1ec7 an ninh n\u1ed9i dung truy\u1ec1n h\u00ecnh s\u1ed1 v\u00e0 kh\u1ea3 n\u0103ng \u00e1p d\u1ee5ng t\u1ea1i Vi\u1ec7t Nam<\/em>\u201d, m\u00e3 s\u1ed1 84-09-KHKT-RD, B\u1ed9 TT&TT.
\n <\/span>[2]\u00a0AMITABH KUMAR,\u00a0Mobile<\/em> TV: DVB-H, DMB, 3G Systems and Rich Media Applications<\/em>, Elsevier Inc., 2007
\n <\/span>B\u00e0i vi\u1ebft do C\u00f4ng ty Vi\u1ec5n th\u00f4ng Qu\u1ed1c t\u1ebf VTI t\u00e0i tr\u1ee3<\/span><\/em><\/strong><\/h1>\n","protected":false},"excerpt":{"rendered":"

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