201305160901 1ef6na

explained decrypted filler

seed 934

Metadata

Post ID: 1ef6na
Title: 201305160901 → 2013-05-16 09:01 on A858's clock
Posted (UTC): 2013-05-16 01:02:00
Timezone: UTC+8 · title 09:01 against posted 01:02 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(A858DE45F56D9BC9201305160901) = a1aabbd90896fbc5de4a83f61cc1dc9e (name+title)
GUIDs: 44
Filler GUID seed: new Random(934).Next(9) ✓ verified
Run: Run 46 (seed 39,043,781) (seed)
Draw: 6 · predicted N = 44 ✓
Machine boot: 2013-05-15 03:07–10:31 (seed = uptime at app start)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 10 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

40B18FAAAFB3A070 9FC3439F003BF29C 5CE9B5D5B70A6C64 B32ADE78C3E0E973 6FF205F18756CE83 C97D881ACBD432C7 A47544D13A759E7C E40F8878806EC046 4913AC796775DA36 0091AE302E012743 9C5CA659D35378F2 820E161976D2C796 0E88DFF8C863C08D ADF154DF40F38C6F BC3BB96C86ECD11B 5A1F4F94BA33D1DB CCF587262D91F109 1C9F95BC88182E79 59507B66E8D674D3 CAD61E604FBE8139 249FFF8824B34DE9 30C83BCCBF2BDFD2 0CECBC2BBB7C95B5 DD256452C83ECCCA 99F79AE3C21BB61B 465B1DF3855703B4 8335461CCCD74D34 F64A004E95E49AA7 2E3DD997734324E6 7BF632C6D18CFA43 66950DF9C40332A5 80BEB1322C93D3B4 7808FF688DEA0B8C 36B1F6FE53B5682B 193CFD192EBCB050 540605A4B2F285BE 10CEDDB1747CE1E5 E21C8767F047EBC6 32AD2053E7964A28 BD1D4613FFEAF7EC 4D219D9C8A1ED520 8151803B6AFA33D4 2B9BA6F8C68BD1D9 9E831E8912CDAE2E 68E3716C5EFF6D62 A4FFB5888F8FDFC1 177F3F0DECB0FAE0 928D08768778E363 FEDBBB7283A59EBD 8C46AF1790F2B601 F9678A42BC27C472 FB3E00423D711B7A 81D74EFA46EA8AB3 5DD52640CF2150E9 E474B2C608F3EC3B DA0415A3E436A5E7 F94943316968FB34 7B45ED8DA321820C D70AC2B592DF7B7A 4550B93BCF57E796 5B544700BFE52E1C 8238C7344F8CF0AF BBD4F1C4710E0300 856B71D54A65F6B8 E40947C274A0C095 9F57E7D3138ADC92 4C6BFE0FC060B520 A1270A9E39C08994 F549E57D021CF6FB 050AC6624C6F1276 5EFFBFFB1B082366 E1E0CE58A13C4BF5 284C5755CE154050 3F2FB03A5A97391C 23E5882EDCC8162D CF483846BF78D10B 830D34B6ADE425AE D8F0809901723F7C B8639C90318F6313 3C95C7658078A12B D685C75CD859B595 1CE2E10A58ACC978 DF8F34921818456C FFC89DCB73D57B8D 0286CD70DB8EF3E7 1A1231550A5617F0 073D8A7F6A21EDCC 5C5271C51FD6B477 9783CCD6AC6FF63B 5C9CD69D23D25A71 988DF4DBA884E07A 84ACCAE759FDA106 1DDA0E6B9B1F8C48 22889DC6340FFBEB 6A41C7EED37C58CB 601474E3A811544D BCB7ECA174A57678 E08A13A7823F0401 A46D8F1A054FA3DB 409E97602955C61B 444509398849D8BB 9E97D7239A3CDB0E 1B75C56E91E42F0B 3986329ACFE7F581 D323286CD5758A4B 72329912959BED84 A3A087CCA7DA5DE8 E14604297A075C68 48A17CAD565DA242 294512186A0F1B4C E6EE12AE5DDA2E9A B193017587F51182 E7060BD48CE568C0 B78B80226725AF4F CC535014F881B6D6 621F5663308876A9 560B5A1E26AC16F1 3741032D2C1C1054 9CD88B380D21CA23 761CBBA07C669F2A 4065E8306EB38BB7 F1C392A6B7BA918D C0525AED44030BF3 8162A3873E5B8F11 33C7D7EB7752A7E8 11754D74F192B2F7 A9D673389539FBE4 F2FF779B0AC248F3 CB82D733088390D3 1F3A74167F6280E9 2114193D7FC4355F DFF8235A229C69B3 C19D116C9F6A54A8 EB28DC7C73D248E3 C3EC8F42B34A450A 000AFEED923D6B2F C644501BE0B19E07 FD8886FDB2146442 A9D78B41FF4C7A2A 3F0D3568FF28F255 51B79078DBC02DB0 C7E9C314E3E7748A 73475FE8698FB67A B0F6DA82C8740B50 6C306E48B5D8B085 911623A581DBFFCD 866B43CA6D0603FF 81D0B313B141C8B0 D92CCF99DCFB32FC BA03AFB3840B8E98 4928CFD5DABD07EB 8E9CB08282FBE250 AE8E115588F8A54A 733EBFDB89D58E0D BBEF38C47A9533E5 AD1852870B4FA2EC 01A86B0B26AE28E0 2477084FC842B6C2 6693C5CCDC7D270D 78DBF47EA68E2A1E 376BB33753489086 E943FA0B2556A39D A31805DB2AC330B3 DBEADD13D5310766 3F35CC6DA6CFD493 5DF82B1F60958A90 AC47159241FFF472 480183B3ED4B70FC B98143CA4AFAF97D F27BA2BB2E8F9E89 DFB4728161B6F389 C3E56338E4B634C7 EE12AFA9A07C514D FC74A95FDD5F8CE3 61BB63EBBE10A53F F66A0608A741F9A3 D930B4E206E1B6C6

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201305160901 (name+title). Key = MD5(password) = a1aabbd90896fbc5de4a83f61cc1dc9e, 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 85821dee-1278-6bc7-8bad-aa1638f1c441
  2 4702c776-3790-73cc-a473-5d248f880514
  3 0b346041-d4b1-5d99-a23b-f0d1fa84ed58
  4 ec503967-e7a3-8808-8fd1-7f91d7c3abff
  5 c59b2a17-5b39-854f-97f3-d2c65520bf90
  6 0264fbf8-903c-7cd6-9049-ad8b612b9b5b
  7 91f709d2-e550-38e0-b4dd-7635b5bc53aa
  8 2a08f3e1-e9e0-0071-bbc5-29d97925e9b3
  9 55dcd340-49c5-4292-86b0-c3c701769d17
 10 472d325e-bafd-6769-926f-f2bfd3d99375
 11 49f4416b-7f9e-31d9-908b-87e9375fdf0d
 12 ee9643da-62cd-5439-bc61-02293ae32777
 13 6b99a0bf-0b53-6497-b959-9beedce05900
 14 e1827c2a-a26b-3126-bac8-2a218027abc3
 15 eca94884-6d84-65a7-9cdd-0f5dd8cc86bf
 16 d9bfa416-7630-2744-8aa7-9be58d2f573e
 17 d245dbd0-201d-40cd-8ccb-a4f194e89f1d
 18 e3201fd5-f668-0944-a50c-8e4cd7f9251b
 19 3264c1e3-136d-8caa-a260-5db87cf2471a
 20 e61276b4-fcdc-804c-8136-b037e8e4da93
 21 1a291178-193b-895e-abab-25c32e85b86a
 22 9b390700-d804-80c4-be17-87370a1f8587
 23 42ad85d0-539b-79d3-a614-1cf3b0a02ac8
 24 f90f7dd8-5ed2-20f8-9ed2-8a8e5a31b78c
 25 7e322549-b38a-265a-aeb1-291fd0346556
 26 36869676-8300-23be-898e-4341cefb7d1f
 27 707b960c-6daf-8daf-94f3-8431b2980d29
 28 b3748e6b-dc85-3b47-bab5-82240ee2b989
 29 825f0d2a-c72d-44c8-9a7c-1ce2a19e821c
 30 da0a0606-6df9-221d-9d81-09ee7c008f06
 31 71b469d8-acf7-8235-9a42-60d2cf32e496
 32 f4474ff5-6722-484f-8f37-d750f7d98ea9
 33 cb0f088b-e660-776e-9fbd-c928f89e4a90
 34 fcd8ed6c-2ce4-3729-bea0-3dc45c91cf0b
 35 588e26db-e585-6c0a-b95c-3ac5c17a2d5b
 36 52b6beb1-086c-28a7-ba4d-a3d3daa1e3c7
 37 0f0e3ee9-3e94-65f4-8ee6-6ba3a4344525
 38 2688f0db-564a-89b4-8871-ab70f944a409
 39 b6fb970a-e11f-286f-9eb0-91a09ca14777
 40 116a14c8-2712-280c-af0b-942ac773ecf3
 41 d1a7587e-fc32-406d-997e-8fce1b0632c1
 42 41804732-0f88-10c5-bd4d-1030401aa213
 43 ff3b407c-2ed9-4bba-bd6f-a77b695624bd
 44 fc6ec0a9-6694-8ffb-ae36-562724549f51

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 67588730463563624088887222834284736268224148. Exactly this sequence comes out of new Random(934).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 6 of Run 46 (seed 39,043,781): new Random(39043781), 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 2013-05-15 03:07–10:31).
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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