201310051915 1nt8ae

explained decrypted filler

seed 677

Metadata

Post ID: 1nt8ae
Title: 201310051915 → 2013-10-05 19:15 on A858's clock
Posted (UTC): 2013-10-05 23:15:14
Timezone: UTC−4 · title 19:15 against posted 23:15 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(A858DE45F56D9BC9201310051915) = f6f9ec9fea93600e4c37a9d9ed705b03 (name+title)
GUIDs: 44
Filler GUID seed: new Random(677).Next(9) ✓ verified
Run: Run 53 (seed 26,950,390) (seed)
Draw: 156 · predicted N = 44 ✓
Machine boot: 2013-09-12 09:30–10:30 (seed = uptime at app start)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 5 · 3
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

0269876B9B24D0FC F2E20DE0286C4769 305BA0FF2827EB0E C65230A83276732E EDA53E51D50B1C23 0891C82F17A47889 9FD66B1D79D7C762 2DA278DEAE2CCE99 BAA2238E615524BB D357F9469DA88A35 408CBDB2E4496FD5 78D3849C56EEE4C9 7B5CEED6072373E1 E1EB95D197E36422 1109BB073550E9F3 83DCD1CB50D80F2D A48F15E3838D0512 FF0C03F6B64460E8 0204F969DBED7493 F736FB243AADA7C8 2840B73A40F1A737 195C380B55944A88 AFE86EEB03480D64 27D183C723982C9F 29EC65613E4A379B 2627A9E1E413730F 8EB4388178345FDA 37741979FD3BD5D7 3C67936370782902 11650D251BABD6BD DD6E427F54A78EF2 2C78BC52CAD50540 127A19A392D5A465 35C4149B2D89D804 94E4093FB48F3BB2 63E78E44EB714975 F0DE520C657B765A 9D8B6932FD730EA9 4C153B5F89EC8876 7F0EE2109EC9C354 8D0B7A9513F05837 C6947B3BE76115D1 B798CE697B64B83B EA848B2D6A378549 ED4443F00059433F E8EF5337DEBB92DC 34F4714EC17AD19D 77C2A61C8F734B4B C3A208E2A1B8A8A3 99BC4C46514C3AFF 86250F2573B6CFCC A346E88C13090626 22E69EA4AB40BE15 ED0D5D2630367D6F CA1ADEC85180A305 D119976580281E94 084EF84302DBA5FB CC509DDE35DBABAB 5F3D14AF1F147F37 F6B3390C9B5CCAB3 EDAB843671F8BAD0 5FA8746C8908526D C386FFDDF9743ECC 85377E200D8F4811 C993345BE72DD06D 6C4A6305EDBF2E3B 2771277624024EA3 3F8749677AA56D93 4F09A89B61845E57 A57D14C296096A5E A2624F1A8FF3AFB7 FD4A09604F1C1507 A5DEB2BBE1238D69 33576F8073C058F0 D4FFE3873976EC02 BC772FDE844D481F BAE2AB16ED17F138 83B9ABE54653F354 636ED5C019B1BC14 5DA007050763A0ED 3A997263893557E9 C2DEB66750EF2E25 F4D4F7274DB7BE56 C0F70F110C953BEE 450858D7839BE7D2 F2AFE8D58751BD60 DE9D4C07655DA8FD D5B294D9E8537300 BDA56E72F846331F 757CD84395CE4085 C44EA4AB009E4535 3D13FA2485628129 8658243126A9566D 258935E862990202 A2CDBEE6462D3538 0C0374EBF17E3CDF BFB475A470A53FAC 0C7680B9164F21E1 5EA17ABD1B3FE7E3 35C878558D0582E6 D6EE3F9D21D98879 260888652681C414 A9C9149B47299977 FF9A4B0B2FB2CC65 A8CD1C42AB399E2B 9C669E6DCDC6BD2D 77105CDD71E7864B 1747C1372EE86E44 41A79B00B5CA2E03 91FD37057B0CF333 857148B689BA925F 79AE82968E167C3F 28C45C9B77B53DE2 3EA32AAA9466B303 E686F471397E5488 7C9CAD54C75ECB48 0C095C49B119CBD1 F9558B50ADFB053E 71AE3E572392D4AE 500CA632529983A7 D1444AC0569B6A44 AD03D56CCD9E4575 7540AD015C71D5BB 616C79F84D0D3435 2DA2BD97B6880DE3 3F6F7369EC7CC9FC 801D02D2BB8CE9A9 17FBA1017575D979 3BE7571F55C0D0BF 6B9244F5A37695EE 17CAA84B6379CF7D F828F1B9B7E9FE1F F42B4F06B0638087 90ACE2BBA342F54F 91A378F7F4848B69 61B339B248D63006 BADC355B10D53FB3 0ACADE9121EA8DFA 52E7E08A0EDE42F7 986209D9FE26F472 20D314FBDB381BE8 90D798AB98C3F4EF 60518800307C491C 09714490A3F78CC8 9ABF749E0DC4D4DE 90F3DE260232A07E 0B1E49C3041E0D58 EA6EFA16B46AF7BE A464B10647C18847 53716AF23BB94D64 0FF99919F54C745D 2B8866D999BF8FFC 140143823D16C42D C2E66B95DC102BCF C394BDFEB40C6ECE 1CB576D7740121D4 E002CE98418E9986 1F73E0D2947B566F ED6DA5637348B804 6F5B5793933D911B 1AAE24A16D3D25B7 471F43F145536732 9AAC34648D18758E 08DAC51D11C44C05 C3F3054C0A076D61 5D39966162AEE003 DBBEFD41EBD6602A 37363ADD38387763 5CA40CA132FBDF4E A98AF3EC8CB64C29 73FAC708FC8C5B00 8212B8C2FE731F1C 86AE256263FA70E8 8550C25D266B1532 033967C41CA4804C C399D6EDFAD60D73 B180EEAEAB178C5D

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201310051915 (name+title). Key = MD5(password) = f6f9ec9fea93600e4c37a9d9ed705b03, 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 8669d61e-36af-33a4-bf08-5cd1aa0a8a8a
  2 fde27b5e-ec11-4a9d-9261-00ac3e90fe07
  3 95ab5f40-f394-827f-acbe-f1464a8ac516
  4 b8bd6af6-21ab-0afa-b90c-c559461b2bc4
  5 d7a3c6eb-c33c-760f-9286-219bc795aa8d
  6 853a2746-b9b4-1390-9b58-67f033763f95
  7 b36cc32c-e344-24b6-9519-9593eb94b17b
  8 be25c74b-38d4-0933-87a1-0529b954ac32
  9 37831ee6-4c35-6b92-9b4d-7fe49017f31e
 10 1cb8168d-97d2-8497-bd45-7fb9e7c1746a
 11 a81da976-9528-009b-85aa-7b0fb320f1c5
 12 e2b7033e-c344-0ee8-a01d-dfe4dd96d287
 13 cfe05d23-c4f6-054b-bb3c-73253aac4d42
 14 a4c8b5be-fa2d-693d-8548-b8687e9860cc
 15 6e4c9f6a-04ac-7ae1-b714-80fbfdd94528
 16 b5cd3508-7fe8-75bb-a6bd-857bb08d60ff
 17 dffa0ec6-4fb9-42e9-9f5d-276fe88f7df3
 18 fb79cb96-2f8a-66cf-aa30-40d3e2fefd93
 19 3b6a1cd2-4836-0063-b5ed-2ba3a7fe95cc
 20 8442aaaa-f6cf-4020-9263-9a7162e986b5
 21 75ec01db-200e-66a4-b827-21c3510e57a1
 22 53132637-d652-83cc-b086-ee84e9076611
 23 b8b0c027-2bae-3ec2-9717-0df5f45ab37f
 24 9bde21a7-f04b-4781-a23f-6ac96868d37f
 25 0f60d90d-90f1-0a95-b955-96b7b817b2fa
 26 658f5067-de7a-836f-8b8e-af5860d8a5a4
 27 bb59be0f-3fea-8f28-9a47-c8ca2ee60669
 28 0b445404-b59d-1804-9854-dddca7935e3c
 29 9c93cefa-d0f7-4ad8-8dcb-3f746e16f1f8
 30 59209979-185f-2e70-9d7b-e7b20ad9978b
 31 fb6a0d7b-4097-1383-938d-d7d1142c8427
 32 665be84b-9121-7146-b1cb-af6b5b25391a
 33 182108df-8538-4ecf-98a5-8d0cd0c9f131
 34 d7e67e2e-28df-8149-8fdd-3e009e88e143
 35 6a390619-a059-0f8f-ac0a-f559a8edfbda
 36 d3924c48-b7d9-0f60-a5e4-63d58a69641d
 37 e25d8ed2-ec7d-760c-bffc-d894ed747d02
 38 ed01aa02-526f-65b0-a8f7-75697b9e68d6
 39 315ae239-e6a2-2970-a5bf-c2878be7e4d8
 40 7dd77764-0e63-305e-b4c1-9b4ef4c715d7
 41 e2d47331-5656-23cb-a4d9-a3f0975e6d13
 42 254ec6df-5279-7a7b-b5e5-870b0b9a7579
 43 358c7004-3696-4181-a57f-0b462225b175
 44 cfcbfc4c-68b9-7e1b-8177-713461cc3104

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 34807120680006774604683408814217480076232747. Exactly this sequence comes out of new Random(677).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 156 of Run 53 (seed 26,950,390): new Random(26950390), 4·Next(1,12) 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 2013-09-12 09:30–10:30).
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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