Things n' Stuff Thoughts about the universe in general

As Intel confirmed, the HDCP master key has been leaked (using PasteBin of all things¹ ), and have been reproduced² around the web in blogs and forum posts.

One, more industrious, individual went a step further and reproduced the HDCP master key as a Python program to generate sink and source keys according to the leaked instructions – which is reproduced here fully for the purpose of mirroring (no copyright notice was added so I don’t know who to thank for this). More musings about the meaning and purpose of all this – after the break:

"""
hdcp.py

Generates HDCP keys (sink and source)

Based on the anonymous post of the HDCP master key
posted here: http://pastebin.com/kqD56TmU

Relevant instructions included in post:
  This is a forty times forty element matrix of fifty-six bit
  hexadecimal numbers.

  To generate a source key, take a forty-bit number that (in
  binary) consists of twenty ones and twenty zeroes; this is
  the source KSV.  Add together those twenty rows of the matrix
  that correspond to the ones in the KSV (with the lowest bit
  in the KSV corresponding to the first row), taking all elements
  modulo two to the power of fifty-six; this is the source
  private key.

  To generate a sink key, do the same, but with the transposed
  matrix.
"""
import random

# Matrix (used for source keys)
m = [["6692d179032205", "b4116a96425a7f", "ecc2ef51af1740", "959d3b6d07bce4", "fa9f2af29814d9", "82592e77a204a8", "146a6970e3c4a1", "f43a81dc36eff7", "568b44f60c79f5", "bb606d7fe87dd6", "1b91b9b73c68f9", "f31c6aeef81de6", "9a9cc14469a037", "a480bc978970a6", "997f729d0a1a39", "b3b9accda43860", "f9d45a5bf64a1d", "180a1013ba5023", "42b73df2d33112", "851f2c4d21b05e", "2901308bbd685c", "9fde452d3328f5", "4cc518f97414a8", "8fca1f7e2a0a14", "dc8bdbb12e2378", "672f11cedf36c5", "f45a2a00da1c1d", "5a3e82c124129a", "084a707eadd972", "cb45c81b64808d", "07ebd2779e3e71", "9663e2beeee6e5", "25078568d83de8", "28027d5c0c4e65", "ec3f0fc32c7e63", "1d6b501ae0f003", "f5a8fcecb28092", "854349337aa99e", "9c669367e08bf1", "d9c23474e09f70"],
["3c901d46bada9a", "40981ffcfa376f", "a4b686ca8fb039", "63f2ce16b91863", "1bade89cc52ca2", "4552921af8efd2", "fe8ac96a02a6f9", "9248b8894b23bd", "17535dbff93d56", "94bdc32a095df2", "cd247c6d30286e", "d2212f9d8ce80a", "dc55bdc2a6962c", "bcabf9b5fcbe6f", "c2cfc78f5fdafa", "80e32223b9feab", "f1fa23f5b0bf0d", "ab6bf4b5b698ae", "d960315753d36f", "424701e5a944ed", "10f61245ebe788", "f57a17fc53a314", "00e22e88911d9e", "76575e18c7956e", "c1ef4eee022e38", "f5459f177591d9", "08748f861098ef", "287d2c63bd809e", "e6a28a6f5d000c", "7ae5964a663c1b", "0f15f7167f56c6", "d6c05b2bbe8800", "544a49be026410", "d9f3f08602517f", "74878dc02827f7", "d72ef3ea24b7c8", "717c7afc0b55a5", "0be2a582516d08", "202ded173a5428", "9b71e35e45943f"],
["9e7cd2c8789c99", "1b590a91f1cffd", "903dca7c36d298", "52ad58ddcc1861", "56dd3acba0d9c5", "c76254c1be9ed1", "06ecb6ae8ff373", "cfcc1afcbc80a4", "30eba7ac19308c", "d6e20ae760c986", "c0d1e59db1075f", "8933d5d8284b92", "9280d9a3faa716", "8386984f92bfd6", "be56cd7c4bfa59", "16593d2aa598a6", "d62534326a40ee", "0c1f1919936667", "acbaf0eefdd395", "36dbfdbf9e1439", "0bd7c7e683d280", "54759e16cfd9ea", "cac9029104bd51", "436d1dca1371d3", "ca2f808654cdb2", "7d6923e47f97b5", "70e256b741910c", "7dd466ed5fff2e", "26bec4a28e8cc4", "5754ea7219d4eb", "75270aa4d3cc8d", "e0ae1d1897b7f4", "4fe5663e8cb342", "05a80e4a1a950d", "66b4eb6ed4c99e", "3d7e9d469c6165", "81677af04a2e15", "ada4be60bc348d", "dfdfbbad739248", "98ad5986f3ca1f"],
["971d02ada31b46", "2adab96f7b15da", "9855f01b9b7b94", "6cef0f65663fbf", "eb328e8a3c6c5d", "e29f0f0b1ef2bf", "e4a30b29047d31", "52250e7ae3a4ac", "fe3efc3b8c2df1", "8c997d15d6078b", "49da8b4611ff9f", "b1e061bc9be995", "31fd68c4ad6dc6", "fd8974f0c506dd", "90421c1cd2b26c", "53eec84c91ed17", "5159ba3711173b", "25e318ddceea6a", "98a14125755955", "2bb97fd341cea2", "3f8404769a0a8e", "bce5c7a45fb5d4", "9608307b43f785", "2a98e5856afe75", "b4dbead4815cac", "d1118af62c964a", "3142667a5b0d14", "6c6f90933acd3d", "6b14a0052e2be4", "1b1811fda0f554", "12300aa7f10405", "1919ca0bff56ea", "d3e2f3aad5250c", "4aeeea5101d2ec", "377fc499c07057", "6cb1a90cdb7b11", "3c839d47a4b814", "25c5ac14b5ec28", "4ef18646d5b9c2", "95a98cc51ebd3b"],
["310e98028e24de", "092ffc76b79f44", "0740a1ca2d4737", "b9f38966257c99", "a75afc7454abe4", "a6dd815be8ccbf", "ec2cac2df0c675", "41f7636aa4080f", "30e87b712520fd", "d5dfdc6d3266ac", "ee28f5479f836f", "0bf8ee2112173f", "43ae802fa8d52d", "4e0dffd36c1eac", "3cbda974bb7585", "fb60a4700470e3", "d9f6b6083ef13d", "4a5840f02d0130", "6c20ef5e35e2bf", "dad2f85c745b5b", "61c5ddc65d3fc9", "7f6ec395d4ae22", "2b8906fb3996e2", "e4110f59eb92ac", "1cb212b44128bb", "545afda80a4fd1", "b1ffea547eab6b", "fac3d9166afce8", "3fe35fe17586f2", "9d082667026a4c", "17ffaf1cb50145", "24f27b316acfff", "b6bb758ec4ad60", "995e8726359ef7", "c44952cb424035", "5ec53461dbd248", "40a1586f04aee7", "49ea3fa4474e52", "c13e8f52c51562", "30a1a70162cfb8"],
["ccbada27b91c33", "33661064d05759", "3388bb6315b036", "0380a6b43851fb", "0228dadb44ad3d", "b732565bc37841", "993c0d383cfaae", "0bea49476758ac", "accc69dbfcde8b", "f416ab0474f022", "2b7dbcc3002502", "20dc4e67289e50", "0068424fde9515", "64806d59eb0c18", "9cf08fb2abc362", "8d0ee78a6cace9", "b6781bd504d105", "af65fab8ee6252", "64a8f8dd8e2d14", "cb9d3354e06b5b", "53082840d3c011", "8e080bedab3c4c", "e30d722a455843", "24955a20397c17", "82495c1c5114e8", "656e71c31d813d", "1f0a6d291823a1", "6327f9534353fa", "b89529c2f034fb", "70e9b12205c7b3", "a06c87969407a2", "520bfa2fe80f90", "da1efc3d345c65", "313936ec023811", "a8cc87128be2fa", "4cd0e8645ee141", "be7975519e2b63", "9543d23113c2a8", "3d87b0da033f22", "df0464c704e9d4"],
["7e1a30947e867e", "014ae464b37935", "5c4babf689fa4e", "c4aec0cb01cc35", "328c0e4a0230e4", "fdacb93b419594", "26deefc8a553e6", "6e75a2d790cb55", "2c4554518f7396", "94b77184cb145d", "95f883f620a8bb", "edff42866a2783", "7b4ee6304b711d", "ed56e077a4b9fb", "c4e60e687ff6c3", "0cbf144b8f64d5", "023dd10a35eddd", "beaa3323e999c6", "d2e016b31c38c4", "8d2917a888f799", "18c3abd28e736b", "8d38e69b4966cc", "624db0143dd2e7", "5e2fa510f632b7", "ee6e64d45b139a", "a1c6d852e74be7", "429843b9e6bb7e", "db9ab07c8dc267", "9efa092299f071", "dcca9e0e61e960", "94406fac95f1d8", "d19122f3f88782", "1b11a662e9c83f", "d161fd6fb7f032", "89f7d984da9d48", "a3583fea45fe58", "885e2c4839e254", "47e87235f713b1", "f4732e05b71aee", "ae026d063f4349"],
["0a481d2db197af", "abfce1039d4ac0", "4a6b89d2d1aeac", "0842eb7178cc53", "b82ce2835f1937", "3b4002ca21d6b6", "e64a78a78abb27", "8bd6142ad04526", "e035dacb23624a", "4cf80110135771", "7a52fafc92745e", "efa28a290ea782", "735617cd8b0221", "b095e9f4b286a5", "021e9ba0727645", "3e58e9ec16ed1c", "d7732bb5ba99a6", "374bde43fa89a9", "cb83e5ef2e4d04", "1da4f73566d134", "e01da194625c25", "d62018764d7473", "64643721313d24", "5a01badd970941", "481c9578781414", "a4d3faa92d1fef", "bd4b247d37862a", "5332a7ca3c2ca6", "393ee51989d5a9", "01a6e564040d37", "390c472ee27892", "f0217fe009e9b4", "5d3f04da415b35", "612ecd5b8e4eac", "757e27d2169f2d", "92853b737b7526", "9ac837c86476df", "e956c2b45ebd5e", "d4fa6da687ac39", "60f4343669ddd3"],
["64b8d778e72e78", "f86cd55efe92b8", "a9adbf2e728440", "966c8282cee1f9", "ea195972b883f4", "46ac03b37e7f24", "744df253954ae5", "22e3f9a0adbc58", "6add7c7d8a2961", "ba963e4912d17c", "2840ac28fcfad9", "8d8ec3ad6dfc32", "a3c788dd094910", "e65ebb61dabb5f", "b50e906b28c881", "003b11eb83e6a9", "a2fac0595b138d", "3d55a28f915330", "c343bd1849a085", "54c786629d2b42", "1d465cb22ccbc2", "d8f87fd52aded1", "ecb34f46656b71", "b4cbe50f839f2c", "2df6a553cc3698", "40b2dd25f26d51", "492f3c5c6fa566", "f80dd453864548", "d4be786d8735d9", "e364511a0fb62d", "3c2df64d6d1c9f", "f640e4ef4186be", "41773025d6ff57", "6147e75d7df3f5", "49809548639d16", "01067ef6034247", "4e7c1b20deb154", "3f8172a6b98ea0", "b0691d4b575801", "136a88607a3e5b"],
["0180058ca8742e", "972bc2ca1c4cb6", "7b05bbc57e63df", "5f01049697eaa2", "c537f3121384dc", "edb1fa0b34f132", "689b1374cafe25", "802d7bca5c6674", "f8e01e75e9eb3d", "a59c2d9126d85d", "f10f603f8c4fd9", "d5a358aa84b2d5", "f8320f2a3bd078", "019bcf0dabb5c3", "43dd8dd5e173f0", "45169f788a0233", "d62daee0e9839c", "7d673cf77a53d2", "008730faf272d0", "3c08080778ae8d", "920e40fad87d7e", "bf118230ffb194", "692baf40b951b4", "83549affe4e382", "68e172f86a40b3", "aa5e2c1b74636d", "c3d7809ac68aae", "33c344fd9bcc33", "6e6057dc7d71f0", "bceef547db57fa", "ec91cc1056e4b5", "8153f00c8ef4f8", "a2ca943ab03915", "079a070121782d", "d592dcec23dd3f", "44ba5fe5078279", "e6f8ed790ffa59", "e7877e834b4391", "d1ca3db32bccd7", "b382e35bff1ba1"],
["96cb3b9ef8671e", "70342fff9216a5", "d635530148dcc6", "bf40909f72ba4b", "e3697761ac11f1", "f2a77a5f435c5c", "a57729bb9aaf37", "14f78a30f9bf6f", "1a7fe7f0271b01", "0b224bc83ef07b", "0d409ce2157473", "adefa793287d48", "a6b13ce8e00a7f", "74d735fd54a00b", "e2dc16285d1b5a", "8b3d55371ce703", "bb3909153586b6", "03c8c622aa53e9", "89ee3322e069aa", "325ce41fbd0175", "2cd1326421cd83", "3c47eed2daadda", "87c2177de0c63f", "39b496d688c971", "179359349f5e0e", "3cfa9ea9345dbc", "47b1948cbfe45f", "2a13b18cf3a0d1", "00b03fc13e6cde", "656ef26757f5d1", "7c584630c27fb2", "02f2e14ca8a67e", "fcfec527978154", "4ec09910379625", "e90fc0a898a5b7", "5beb0f3ee5d03a", "2383832708cfb7", "6905747e27453e", "1714e418f0f0a3", "53bcdef0965e8d"],
["2c9b5813b90c3c", "bb9a20c8ebb80e", "045e04f3d57918", "6fe6ffb0718731", "201760abf11c27", "e289872adda7e1", "233e7ef2b2c83b", "423b4c0ba711db", "334b15e5bd4c01", "034d1e41bff0e8", "58a436cce28ea3", "e6ef4d94b49962", "ec8728db63716b", "8c8ffc95c21b06", "0beb50502d9acb", "c1eb732268091a", "e45e0c30cfed36", "31d58c384bc3e4", "8a26ae8b7a5c60", "83991e11e8a21e", "e4f193c0183e07", "691fbbf9ccb4c2", "4e5214fae905d8", "2052c969e9699d", "f6cea5a6157de3", "fd84477a6bad8e", "04f37758724bc3", "a491d0fd8f084e", "19933cec5f51f0", "93794e76e1f29b", "ebd1f1c057b30c", "7ec220fa6d31d9", "867d711c9a7674", "a700cf5f177e37", "cf3fae5da3ddc4", "4e8030990c7917", "553a5ce2abaaa4", "c2296c42e2dcea", "19ae4f9b654581", "66d5fff1163703"],
["bb5085e0e7d595", "12605df8a35f9f", "35c6d572c28ea5", "5099437e5f5595", "fb45cdaa8872f1", "6e012db5feedc3", "1ba0e5515be76f", "b793b687fbf1dd", "9d2c01063d4ca1", "c2e6fde5bc3a1c", "c17b11e1a33418", "436fcacef170c5", "e4c3cbc3066618", "2063665d2a1b84", "a8b5b4f2e58850", "ce74bcbc892d71", "b312d96806cdc8", "82d9c95678fff1", "5d8a0120206c3c", "621f13db39bd6e", "4a5db4815f181d", "8dae6e596cebd5", "1b8b1681dd4918", "1dbcbd79f8e5ff", "135064b0968c4e", "d81e91507c1e96", "ce08e072644e54", "e1648d32befadc", "d0b7f41fca118d", "7b9291b680b18a", "10ab9a2fb4f9a0", "9f462d2370dd03", "bb453f4b48b2ea", "b3c3e6d63c2559", "be4aa3d8e8f129", "90af78e01d25c9", "2e06a8715063da", "988dbf792de669", "17eabe5b043c41", "b1f700946e4ad2"],
["e329ae8a66581e", "4a5bda0ff2a313", "79577080aaac8c", "0dd34f4f929df3", "0f5e87f82b9b1f", "1ead67333c42d5", "ebac8fb8797375", "dc26965e625abb", "953ce074d8c84c", "2edd54991b2104", "a45196065c2bca", "98f56533f328bf", "8560a1a390e921", "37d2506aff3d7b", "f88576a47d273e", "562b7c9592ffdc", "2d0ff0ba59787b", "4dd89971bd39a6", "7a4a778d69a4cc", "58bad18bf5fc74", "5cac8d53dcc72c", "ba7e9c7a2b57d7", "ff544acc98f08f", "1d22f503712081", "cf868290f04def", "ba48ab7c61a8ab", "3ca439f055f713", "2401e3a43338e0", "b7c4b19cf1edc8", "37db6b0d8991a7", "10ede95c9c35e6", "a8f021fc870126", "6e5909a7f3217b", "33772e647266ff", "a5c8fd0c786e0f", "04f0bb34025c67", "cc33c6a49bf101", "45c563f33f807d", "6e95e9c2b5e349", "3a0e55d42d44b7"],
["611138d0e928dd", "24d7958e8e6149", "c66faf12b50f45", "eaa5eb19337961", "e68c81cb35d5d3", "ed1fe1f1b8d443", "612ca593de8afe", "6c15ee22ffb8b0", "c27152ca5a1e77", "0133b8165e3ed1", "608c9c1a6ca4aa", "df5272bd1b6425", "6f7efc5b2bbfa0", "b49b5f0c67ee30", "f4ef0e7ed820cb", "4b14d077b672ce", "3a60f2386c0218", "9e8d6e5f6caddf", "a53ccecbae8684", "d3183beeba0cef", "4cd21e6afc08e8", "5db41995d15a93", "6afe570246af77", "d0994bc305b27f", "2de99a0885c909", "1629a47aaa161f", "0f6b6d45ff8967", "cfc4e83f5b469c", "cc22586cab3936", "29e6b3f94d122e", "83f00e419d8980", "bb282b6f3efdef", "30d80463fb25e0", "1846f8f1b935d3", "3c03ed5243b7b4", "cb6b0e6e4c770f", "8bc2856390163a", "73a332bc2ebabd", "b3aeafedbc8c08", "74ff7726398cd4"],
["0071d5d3644b97", "45dd1ae0369e9a", "c1f518cd384512", "b933bc25cb3402", "9377c50007d647", "e609eb009c9245", "7d99fff828ba6e", "9f0adcca6cd0a9", "5c5cf8366b699f", "f00f513ad9e29d", "7c2ecfdb5afe40", "1f131691f0677b", "30e1df0cce8710", "f3c52df030e941", "b2bb6b650cf2d7", "012a5a2d11f1b4", "4699b78e898918", "977b2e06972b36", "674e2619e6be97", "93007948f99eee", "af2b5b80b81bb3", "417446ac93bc16", "14fb20c6ab0e24", "3ffc77d1672771", "36580afea2edec", "48942ed95911c5", "fa312a7aca8f83", "992e36a47ef1db", "3937ff39b1a9b5", "2af79ef5c48c64", "6c88d58111a0b7", "b6fa6dc5f7c8dc", "b1acc64f2b083d", "332baac65b4feb", "e58dae530ad4af", "0fbdb072d0ba36", "e2607b065b6fe4", "f803ae22cb2a6c", "9b639dd91166cc", "f5e430b9cece8c"],
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["0a5b9e2ba4a53b", "63db0419a96d30", "f68e038377a61e", "aa15b78389ec74", "5f532809ff80f1", "f2892acc49ca4e", "e2d68174c08e81", "378254a38f5138", "0b060222bb20b1", "8013f6f4745c47", "ef08e87e2c197d", "b69d5ddaadf417", "7bc66fe482b730", "f4bd76d3bb1dfc", "09492b63f2935b", "43875dd685ab00", "e15a528f666486", "aad1fac042ef90", "b3bb7b8ef9c2e9", "c78967b9392a1c", "2f05fd5ca0230b", "1008345afdd18c", "dac73c313ace60", "346d535e500b62", "12e6357496459b", "ecccdac5a34926", "3b880f7098608f", "e66c3352a9cdd6", "049b176ff1a04d", "897d9569948066", "806230e9740d6e", "179ebf2b7952ab", "3a2c5079b5bbea", "73261b85c35fb1", "5b917dc1bf7e57", "9c55b95581c1d5", "e1fb86e6219639", "c72a22d8404448", "95dc5d7b966027", "457f3fec730d5d"],
["469cd82a2b3cec", "021d9de560b8d6", "85b4d126933886", "c8265dafb87325", "8741d99af7f420", "1329e52d3e66f8", "7d37c458a6ad05", "1241c5ccbc355b", "7fdcad3c3c269d", "05f04a0a23acc7", "ce076aba97cc18", "74b36afc4645b2", "cd7adaad8f5b91", "bd0651649dc722", "3d9b6437c667fb", "6827ec09eed45e", "8ad6102faa934f", "1a80658c0bfe1e", "ef1749235ab59f", "75478ad5949a06", "49ce6e19841851", "8df41dc39cc628", "bd9dc9bec89c8b", "7771a21fe8028c", "65082929b051f3", "c657798a3aebd1", "ce9c37c494cfc8", "156efce8330e42", "d0d95860d39040", "dfb0fb66f814c4", "4b421540a0aece", "9e767cbf7e9c49", "eeea5b5c866a9e", "e2026ca4bfb067", "ec9fff1a5d41c0", "290ed4da32d333", "65208d00dba471", "99e1d15a83b736", "5585401976a265", "1668daeb4aad72"],
["cdabffa646baca", "7a6c7bb29875f7", "1a87a53a2139c1", "1ecf7ae823158a", "b1087bf595f7f2", "d8e668fe076e4e", "b0794cf137a863", "81e2a419a320ac", "8090b1d39e5171", "813903d5f1a68c", "ba31f8211e56bb", "52413eefa30a66", "af88d053eb8a4a", "4d2235fdb9bf91", "69a947973d3ed3", "0dbcf583c26ffd", "b6bfbee58458b7", "5a12f3e625e5d8", "53ae22c2b1bc6a", "8e6f7e7bbde691", "2b692a6746d3be", "686438e4ac66e4", "aa77be21178471", "36aed3fc3ff079", "8c9373ebb1c2f7", "bb99fd5bfaebc1", "665902d08610e8", "8af0db91b80b6e", "00d4995f9a6ce8", "1d503d26442bd9", "e61b181dfd0949", "2a02f5075a277e", "76caa7ddc435fe", "5cedae4cae7a57", "4b5f7c58c4f214", "1446a05c1023ab", "459c93a9f5ad37", "1ea5f5aa4060b2", "a48215350fcd60", "ac21e2a4729a51"],
["f18cf87ecf430f", "0fd48c241ac6bc", "33964cd2e3d9ec", "8bebeffc2e848e", "bb84a5c2ea9b0e", "311f20ff7ce601", "752573f4effe98", "79dbe4d184dce5", "6bb04def99d322", "7d2d5f23c2475b", "7f93f7dbddf04e", "fff303e751fffe", "08d205f8999a3d", "5750d14f75e056", "1107a3f96ca8e9", "f62b50c8ad9f20", "53e7fcc55d72d8", "6345dec1054cb6", "01d52c21dc654a", "aa0bd78e39c594", "2265b675381cd5", "57cc03dd65f821", "1fa373049059a8", "9885886b48085f", "8357ab98192a14", "5bb6cfbf84048b", "5cf862f25ff6ab", "c9382e36ab2dbd", "2357b5ade91fcf", "2db77558ceef24", "d4a0cb3ba50a2a", "12c3cb633dfe47", "db805410168807", "a5e635ac766e1a", "25252810f49fad", "cae296fce18ed4", "b9932d5822c519", "4b7006cc54ea84", "2546d761d284cf", "2346d0a11b1ed9"],
["81ce0d028c4474", "c8002fd0315372", "8670db1a6ad6eb", "4c7f942260e9c9", "822bb2c423cc53", "e3b67febea3672", "59c24223d913c3", "6f4b196f69400f", "51bfb6cc7f3603", "fb9fbef84ffaf4", "7c1632636806f6", "a50ec42076931f", "f68b2be9e5e7ad", "7603302a518bd4", "d7cd9bb97ffa3c", "acf1faaebf7412", "f55d55d548bd86", "5b34112ed53d06", "1b58692e1e33b7", "cc7e3cb6d32fe2", "8f7b35c14a744f", "9a4ed599399554", "8eb369e71641af", "d4a6d1a5c74123", "8cc7ec376acf04", "ec0a470647b248", "2fd9e8eea1f10e", "94439285677960", "4d11f6e6a426e0", "06378817230b68", "ec14f2df152cb7", "199a8c0bd5f05d", "ecad5aab44ac2b", "ca87ab2ba6e905", "69c0bf2acdb36c", "d66279737bc807", "4dd946eb19d81b", "4e9c473b5e9846", "5a016f7ca86f9d", "d02c2b7dca744a"]]

# Transposed matrix (used for sink keys)
tm = map(list, zip(*m))

# Generate a random KSV (40-bit number with exactly 20 zeroes and 20 ones)
def gen_ksv():
  random.seed()
  ones = 0
  zeroes = 0
  ksv = ""
  for i in range(0, 40):
    if ones == 20:
      bit = 0
    elif zeroes == 20:
      bit = 1
    else:
      bit = random.randint(0,1)
    if bit == 0:
      zeroes += 1
    else:
      ones += 1
    ksv += str(bit)
  return ksv

def sum_row(row):
  sum = 0
  for item in row:
    item = long(item, 16)
    item = item % pow(2, 56)
    sum += item
  return sum

def gen_key(matrix, ksv):
  key = 0
  for i in range(39, -1, -1):
    if ksv[i] == "1":
      key += sum_row(matrix[39-i])
  # Key is the first 56-bits of this
  return key & ((1<<56) - 1)

ksv = gen_ksv()
source_key = gen_key(m, ksv)
sink_key = gen_key(tm, ksv)
print "KSV: %s" % ksv
print "Source key: %s (%d)" % (hex(source_key), source_key)
print "Sink key: %s (%d)" % (hex(sink_key), sink_key)

Obviously one way to look at all this is to say that some free-spirited individual in Intel with access to the original master (and a twitter account, as linked above) has decided the world would be a better off place if Chinese manufacturers could create dongles that convert HDMI ports with HDCP encoding to something I can connect my old TV tube to.

At least this is the angle the major media outlets have been taking, and don’t get me wrong – I’m all for that! (The about to be released Boxee Box has only an HDMI out -quite probably HDCP protected- and digital flat panels for TV viewing is still one bandwagon I’m not on.)

But let me offer a different angle on this story:

In Ed Felten’s article Understanding the HDCP master key leak, he mentions the 2001 paper from Carnegie-Mellon and Berkley – A cryptoanalysis of high-bandwidth digital content protection system that explains how an attacker that can gain access to private keys from 40 different HDCP compliant devices can recreat the original HDCP master key in full. Gaining access to 40 different consumer devices and cracking their fail-safes to get at the private key may sound like a lot, but I reckon that a dedicated person can do that when you take into account that having the single device that breaks HDCP protection can be very profitable.

So one way to look at the recent leak, is that Intel has simply taken countermeasures against the future proliferation of HDCP cracking hardware on the market – they deliberately leaked the key, then when suspicions were raised as for its authenticity, they publicly confirmed the leak and made not-so-veiled threats that are easily seen as not applicable to some markets closer to the west side of the pacific.

Either the key is really genuine in which case the angle is probably just to make it less likely that such devices will hit the market soon cheaply and in bulk, by raising the risk of investing in such an enterprise – as many other manufacturers can hit that market just as easily; or more nefariously – that the “confirmed authentic key” is a fake and building devices based on it will yield no actual results – this would throw a very real stick into the wheels of any one currently trying to break the HDCP security: they can’t ignore this new possibility, and getting this key to work in an actual testing environment is still costly and time consuming. After investing a lot of time and money in reverse engineering CE devices, then “getting  the easy way out” to finally found that it was all a hoax – this can really break the spirit of a devoted entrepreneur…

So that’s my take on this, what do you think?

Related articles by Zemanta

• Intel is investigating how a master key for the High-bandwidth Digital Content Protection (robbiz1978.blogspot.com)
• Confirmed: Intel says HDCP ‘master key’ crack is real (engadget.com)
• Intel Threatens To Use The DMCA Against Anyone Who Uses The HDCP Crack (techdirt.com)
• HDCP Master Key Leaked (blogs.securiteam.com)
• HDCP Master Key Is Real, But It Won’t Do You Much Good [Security] (gizmodo.com)

1. Where it quickly went out of control, people don’t seem to understand the concept of  “mirror” or “offsite backup” 😉  [↩]
2. 1890 sources, total for today and not including this one [↩]

This entry was posted on Wednesday, September 22nd, 2010 at 12:13 and is filed under Gadgets, Stuff, Tech. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.