201307230944 1iuojz

explained decrypted filler

seed 685

Metadata

Post ID: 1iuojz
Title: 201307230944 → 2013-07-23 09:44 on A858's clock
Posted (UTC): 2013-07-23 00:45:00
Timezone: UTC+9 · title 09:44 against posted 00:45 UTC
Author: [deleted]
Account: A858DE45F56D9BC9 main account
Subreddit: r/A858DE45F56D9BC9 the main subreddit
Category: F3 filler: 3DES(name/title) → GUID list, seed known
Size: 2,832 hex characters · 1,416 bytes
Cipher: 3DES-EDE2 (two-key Triple DES), ECB, PKCS7
Key: MD5(A858DE45F56D9BC9201307230944) = 5c5e7444b2a2d900d3e4b2f3c204c656 (name+title)
GUIDs: 44
Filler GUID seed: new Random(685).Next(9) ✓ verified
Run: Run 49 (seed 822,652,546) (seed)
Draw: 82 · predicted N = 44 ✓
Machine boot: 2013-07-10 11:27–11:29 (seed = uptime at app start)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 2 · 1
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

E9DE85F553FB4B6D EC5603B9A18F8821 E7AF9E9E7A53DE14 AFAC2B2CD8B63863 ED5C0D0647F33E53 CFA521C7571E0930 D70AC3F68C27B394 6B0F8C8DE2362070 EA9E649BF5E49834 DE8EA57AFAF5904A AC252E6D4E3BEF27 55044C7F1977C273 F7BD727B4002CEDC B7D59AEAD928F045 71AF87004CF67986 17A31D1055367F50 CAE21AEE19D59937 9EE4FBDBD6D91D85 FE444A29F1BF459C E55513971EA5A7B7 4652997B6AAAD764 8483AE4E122EAD33 F2D915A52BCCF6F2 07558F726E138DA4 3352C5FA2DA4145D FD38D48107C3C3D3 7CE58B86BE37E43F D850D674B7644BE6 E800EEF50EC1C501 435024F17BFE7EE9 28969AAE9CF3E267 0849F64DE614EBFD 457204AA8E8E41AC 7F20B4796AA6948A 9B7FEE03853E45EB 8E967D16543AFC99 9E720C4FFAFD64EA D8D4470A4AD6B9B9 861726160BF3B4D9 FF556F64B628677C E1886889E6DFF70E DB3D6E6A3EC3640C 6451979511DD81CC BD971B947D40637D 4BC863191AD956DE DD6E4790E6721C02 700D17F94EB00392 2B657F6848266977 10FF397DF9667473 77285BCE3CBACBA5 4AC9092F666C4ED6 E1FFA26B72CE2DB4 C1AA8A01305294AF F5C3A2FBDCD98566 D0E18A36337BFDAD E4429DD8910B88D3 E473721D8E18687D E3AA7DD07BDED917 5149C8859BF8398B ED3502108595FC17 8BC60702D5533311 7113EB112474E744 24FACF3DCB602C62 E7772543BA8B3BDD A4648C62F0C895A0 E77946EB3016527B CDCD0C07D60C27E9 01674C2C04754366 489BCE25695E149A 844B7747698361AA C3AD360656F2B7F8 E79D02686B0056E0 2FD07C9A2332C876 7EE1B7BBE40B4A3F 35BDB36B33F07FCD 86FBED25129A6426 9F033586D36E770B 69881B55FBEF03CA 66F565E35982225F C2A2A38D696F6A51 0BFF55738C5AFBC8 8D1B94A77DD8CC72 9B6520F5DB68D54D 092C36EBC89F18DE F8B4B3F0C7D20683 D022762E87D24054 D3E32DE268EEF39E 9B96B25B22147CA7 487A974FB7AF89B3 DBAEC5DCFE7CC9D6 4AA0733CA5AEA89B 39233F611A2895E5 1C000371CF8C2995 9CBA7C1DB27C6179 D8E2EC1179EDC979 0F35814236F39ED5 6670AD5DC6587D58 4810ACEF49E2200C 3BA61D26DD72E1E3 A790A068CD80B5FC 57CAEC922A5B3CD2 53B9075FF4337821 B594CFA014047672 01CB545890BD1608 F2E135CCE3174456 9E5272D40FF26E87 E6AEC0F6263A8970 C84045102D0F8D8E 3327CF11668E72FC 9D7F81BBA1F9B374 B0589118C4EF0349 35E218B19D9CFA7C D9EAC3BC872FDA06 D3D6CC0854973575 C4450335F58044F4 FC34DFC288CF78BB 574868BE7F64F433 BC30E3B54CF5CAAC 58DC1FD677337C2E BBD5A0AC79F0B20C 9C716C5822F5BAC1 FD28FAA3EE439136 939CE37611113717 77AB7EA0E52B1D22 4ED9B34C6B5C61F9 96350AB3457E73E4 2D21552AF5C94AA8 9F9B303447F2EE50 0BD808C81E1D9D8C 7C3C2F81C57F112F 44021EB3C09553B6 616077C2DB65EF80 EEC8EA6F8343BCE9 78DFDE41837CF9E9 F05F674C68B169D5 53E3DDDB04F00457 E0F1092E4A490F56 F589911B66D7A70A E419FAE0FC76EBCB 4D48713172D401BD 14914421D7E88390 4CA8B00BA21EBC93 8B4D72E847370C72 E4E3F5C3F45980A0 ABE2352403B637D5 3EF41A092BB1CDEC E4742E8EEBDFA3B1 2406E9492BF6117D 5600E18590ACD2C4 AA6A9E89505CDA13 0C4DA6372A1923DD 7F47B8D1604CFB76 E28BB4CF54BEEF2B E135F9C2AF694179 10239FC3B33B177B 4C739D44BA4E4BD4 EF6DB5404CC44759 9B29DFFEAA53A1A0 8CA5184C8CEB8401 94B2C28BAF534484 32C60F828C3831C2 AFD18C6CA81F3FB2 1327C3686D0AF62D 044CB327FDD4245B 52DEF0C35826D315 23BCE320A953A4C4 B0418FE04027FBE9 6C26252638F3600B 36857E6DCC328666 202E7F30A0098E46 4231789D59F927E9 2EB8BABA71637056 0CE6E8C42769A278 4E32CBEB51A35B30 7063476EAA1EAC96 1A3CB9A1E1BD8066 58397F7C74294F6A

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201307230944 (name+title). Key = MD5(password) = 5c5e7444b2a2d900d3e4b2f3c204c656, used as a two-key 3DES key.
Decrypt. 3DES-EDE2 in ECB mode, then strip the PKCS7 padding. The plaintext is 44 GUIDs as hex (shown below).

Decrypted: GUID list

  1 30f275ec-12d3-58f4-94b0-4b3c25650766
  2 e9f1e6b8-8148-7641-87fc-54bfbdc8f744
  3 cbd926af-8b4b-5a96-af07-d2c0cb32f8f7
  4 88c2c677-feed-686c-a837-b172a997094f
  5 c2cd9c1d-2528-42d7-a470-12f58542f8fd
  6 994d6ee8-f4d9-1869-85e4-be15b3915f23
  7 ef814ed8-c3ca-722e-b518-7a4d8c91803e
  8 5b1d501b-50b9-0c61-ad96-f81c75649b51
  9 b8c622d4-2eb5-6671-b5a8-8eda7bd57a7c
 10 324224f7-2acc-7ee7-90e5-00dcbbad49aa
 11 6902189c-6957-846c-921f-2526ed13396f
 12 04b92cfe-dcd4-2800-b77c-af9c39f88410
 13 669e9b24-0ad0-4bc3-8e2c-3e37d8ca3af8
 14 bfb632b3-f77f-7faa-86be-0e2915c5856a
 15 4f498d0c-4a10-45c1-91fb-62d46fa83688
 16 84b72a55-25e6-70af-bdff-48c98b299c0e
 17 10794d55-875c-73d5-8374-daa193f5e377
 18 2c6eac9b-ca0d-6d83-9cf2-e5fd0b6d0035
 19 af147c68-0397-158d-b295-4c91b76a15f1
 20 ba6450b4-b3e5-41df-a178-765072cf91fa
 21 20597b91-1dd1-7c91-b8a9-949bd1fb1761
 22 f1212b09-fa77-8bf4-a530-05bbfc1c195a
 23 8dfd03c3-9ee1-65e6-939a-a02ecc106f56
 24 6776b88b-3453-3d84-8017-f64e785a6274
 25 9f77dfdd-b8d9-7537-b498-b66a2826bdf2
 26 466ddd01-8348-0ec6-862f-991a67efbd6e
 27 3048dd06-98ae-7fca-b6ab-929992dee298
 28 42a1bdee-2a84-11ec-8e72-06658ed31a7f
 29 1e09c51d-eca7-6c67-a5e7-17302de86213
 30 936715be-18ea-6c8e-82bc-a05617e88567
 31 d96ee22d-1b16-02b5-be26-626b6523e9d2
 32 37563a27-8ac9-7c47-8b12-43f923f91e94
 33 3e41cf96-da9f-6790-b0d8-67f7b1cf1bcc
 34 7c154a57-ce04-1791-8441-1d46cc7b2d6e
 35 3fcf2fec-a04a-79ee-ad43-f2e47628f0c7
 36 41e7151d-133c-4dfb-a0fc-b502cfc7127c
 37 6c9e52b4-78b0-4ab4-9e9e-39a3b1a49309
 38 de4688b3-1e4a-16fd-95ec-d9590bcb26d5
 39 d8319a44-968c-5853-be27-bf903dc22cd1
 40 deeae6c7-84ce-8fb7-857b-8ae2964489e9
 41 121cb1c0-9b3f-3398-ba95-a64f92d5e810
 42 e0e3e831-bba0-0f09-8321-f55d27b94594
 43 a9f472c8-babb-001e-b609-28b66cc43120
 44 76054908-e86f-7d0f-9646-344e232b15a6

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 57564170678247477614786370716607617441583007. Exactly this sequence comes out of new Random(685).Next(9): the per-post millisecond seed of the mask generator. The other 30 hex digits of each GUID are Guid.NewGuid() output and carry no message.
Explain the count. This post is draw 82 of Run 49 (seed 822,652,546): new Random(822652546), 4·Next(8,16) per post. The RNG predicts N = 44; the post has N = 44 ✓. The seed is the machine's uptime in ms when the app started (boot 2013-07-10 11:27–11:29).
Conclusion. Filler. The content is fully explained by the two RNGs.

Metadata

From the post to its content

As posted (encrypted)

Decrypted: GUID list

Explanation

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