201302270208 19bddh

explained decrypted filler

seed 474

Metadata

Post ID: 19bddh
Title: 201302270208 → 2013-02-27 02:08 on A858's clock
Posted (UTC): 2013-02-27 07:08:57
Timezone: UTC−5 · title 02:08 against posted 07:08 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(A858DE45F56D9BC9201302270208) = f87095dee285989d5ffb9e5c07e732dd (name+title)
GUIDs: 44
Filler GUID seed: new Random(474).Next(9) ✓ verified
Run: Run 42 (seed 983,934,859) (seed)
Draw: 54 · predicted N = 44 ✓
Machine boot: 2013-02-13 10:26–11:32 (seed = uptime at app start)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 5 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

51CF03D4DC63756B 9501FAF835B04FE9 3B1C7009F2C64854 3A72A743715A837B 8810DE412F58ACC0 51FE427C4605FBBF 524FB4E2EF295709 96D77202AEFE25CD 03223D3C7D46F159 ACA8965ED8F8E729 50C7395244F87319 14B63BF533E856CD 94BCD759D0316214 5C96FF88A86A91DD AEDBF28712331E7D 1096665DE3308136 0E3E864DF39AC793 7C52D8AAD00824BB C38BE34905315F22 D20E25C47E5A6B7E B8213E9CB6754A08 88826E3386621AE9 41CBC14F224B3496 03737DE1984AAEAB 03E1EF5C4859F0EC F470BC46B1A7BDAF CAB1E479E42E4290 E8326A438495EFD1 1592FD5507D9C44A A4FF64BD321C04D1 447F0952C5D7D69C 386F8004BC78712D D76D50483C670E62 6D6B6D587ABFC1F3 DB4A364B58946D18 BDF120B1CDF4CA52 6A435FDE50682FA7 AC66DBFF0347CC84 C2C1481F7FBB2FAA 19979CF2EE4D24A0 5CFCCA06D40C066B 60FF03333A27AC77 A09252353B4797EB 36CF0F3A1FB017CF C130079A674C3527 7F1CFE17368272A6 F6756FEA445A7D05 241AC4F9EDE33B5B FCFDFB1DCC906701 D5B75AE18398A029 BEFFD5643635D7CB C07A8FA16BB68736 33245086106FF5A7 98AC4803E9B23692 1D83A1738AC82EC7 542A11CDEFB43E44 279AFDF0D4623D00 D3B7995F4F831C41 9E93E94868A0F2A1 A7E094F072D75858 4ADDA359784B6EDE C5E39D6D32586281 4C7C3CAD2736D0F8 960E3BC5ECD9D24F EDBB43365CF44E78 38CC642C3A15DD88 DA6ABC280767E75F C71A9153A4774093 6643F03C739A4B08 C64065CEDC8E63CB 0985FE572377D6C0 DBE67BEFF461E62C 01A997285D3256A2 E58D8800383B5072 5E55C6FD3CDE9310 1DCA7A8BCE2F0583 FCA906609C5FEA34 3F24F252D83551E5 9BD0BA3D80D431B9 3044DF761CA1454C 03D33DB2D1EDE1AE 50C59020BA594FC1 81F104E4B0116F7A 22FCD8AE041D17FC DCC1F3D5ABA4A6F4 4DEECB340C735A63 DB4656C0F92B87A2 0C0F87108C9CA3E8 BBB20924FB07B9B3 D54AA089E68CB544 EF2926E394C65584 938462B0CAF1F59D F5F7E53BA285F31E C6A2BF285E5E769E 101E75269F2B268F DEBE5D40321E5552 F070CA0C4D3F8027 498D08D5EDD5269D 50240A08A92FEFB4 0131E0EB5775FD08 EF0A5A4D5F9FFE34 AFB8DE2F4EA255B5 396D0F6BAFA4F9B0 03A4892BB4F48CB8 A2E542C6907B2A63 5AAA5B00BD2D55FE 97F015DE702272BC DB732E78DE91F19C 6F055DD23C7A1A98 733E7ACF2698877F B6609A53F62078C0 703A599ED19CB463 71C60902F0E94817 52352D69C50594C3 3991603A91761204 454FB9C992BF89A8 D61C08975E3D6562 62FD88CFAC9BF5D9 11D52A81020F9A66 3D06688567F61578 F23C7934C0F6EFD6 DD95964B609C80AF 01829C364A46E5B6 B4B423A8ADFD78BE 7E2DD73974DDF745 3C82C154979D5B81 947084F76A79EFE7 6270F8992C68970E 093480680750AFB9 F8F5B4EA806CCD91 FC323E599465C7B1 BE3DE4ECDA4AB03D 23CD011EDF64B896 E435E35B3C9EEC73 39A5D6FD92911EA6 2FCB834D8E5B6471 54B1EC9332078111 E3B7443EAD6A8FEB 9313A74EFD69BF8A 492F11E4607E6A67 CC9C1606B513D26F 0B2D604C46AACB11 5694936E2741ECC4 305F8C8C25F62F32 FDFA49ADDF04770E EB1C47A2165A60BB 533AD6D80BC86042 28EE83A073DA2EE0 192C78BB81CDC4B0 513CEF11A4B9BC39 5052CAABFB5A8194 AEC3ED3D8788890E F16F148581BC54C1 20B774F37563C695 611024AF45E6033D E6464D030069B9EE 5AFE7A9C4EE8558F 10BBDEDA50C24883 E96AC71ECEC627B9 CFDA7BB0E5BEA759 B73CAD5FAAB8EB22 DA9210DA6E89964D 63620A763DF7019A 03893F76A9344CD4 173C66B1C7D1E656 52E6A9FD5F8E89C8 51067D635D7BC9DA C42B033C10FFBDE6 4CDF330CF6FEC3A5 2049338382B37FBB 58ADE86837D772AF A64FDCDFAD251751 5E4A4AE67178B050 C06088773EBE1ABE 2E3230E8E64CCEE9 CE3B2CD319A79089 720213FF8352F401

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201302270208 (name+title). Key = MD5(password) = f87095dee285989d5ffb9e5c07e732dd, 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 975d4cf4-3a9e-3a83-95c8-b2278b821641
  2 0faba79e-c774-85d9-b02e-ad2ff93246b3
  3 870bf691-9a1b-09c3-a1f2-09ba9bb0cd34
  4 d196dc0d-91d9-6e8c-855f-d30f2335df37
  5 c4bcda24-07f7-1802-b3f0-fc343d5af74c
  6 329a440d-fe69-7209-aba2-74490ab9ffbb
  7 f90e0691-beb8-25e3-85f5-745129aad91b
  8 d6ca1af8-3195-2955-acfa-e4ad154d6e40
  9 2a4bbfd9-f540-5d30-8d5d-a57b922311c3
 10 913b5e24-430a-0885-adc3-26f25dd1e68f
 11 8fe0fb82-6ca8-4aa3-85b1-35f9c7e343be
 12 f73cba5f-9d11-4c6b-a19d-4b430aa9a66e
 13 d7f3229b-9427-4f7d-ab80-23372c907de6
 14 f6efc656-ceca-0e0a-aa9a-8e002c77be15
 15 4a927534-cd9c-64ac-b6e2-11359df6d8e7
 16 f81ea153-ad18-0413-ae59-2fd489e51626
 17 4165f994-50dd-19b6-a033-4095bd27df11
 18 075f44e6-abea-7526-b7b7-b7a332481c60
 19 5c17e1f7-cd20-464d-a7e5-a131a35fd2f5
 20 b2dff1b8-917b-70ba-ba12-9a594bdbe54b
 21 77448de5-f2a1-70bc-bbec-fb04680b2591
 22 a2140ec0-a95b-1f93-9546-1bcc052133ac
 23 d068f6b5-daba-0deb-88b2-da9164abf36a
 24 f7c62981-8481-5ea4-b52f-24b44eb303f9
 25 f24880a4-f9fd-12b7-ae26-d3037295e6bf
 26 260092f6-e7f6-3be4-a721-2cf0a289ba16
 27 b3e0cab6-4149-413b-bff3-6576267477bd
 28 8d2630ac-19b3-3984-9c4b-441a99a88fa9
 29 19df9f36-9e1f-4d0e-97cd-43437d718bb6
 30 2b718d67-f6f6-70a2-a284-12d98b659384
 31 93a71cf4-ee58-1020-9f18-40d0894f0341
 32 322a2ebe-232e-2bc7-b5bb-35d11a3b4004
 33 2e68431b-5819-86b3-9285-61e60668a659
 34 484c76cd-341e-7e5c-97e7-df38930c6947
 35 880eac02-6b92-1da7-bdb1-b4b1c26ab8e1
 36 359aa793-c7b1-29a2-b7ce-a6a43e910b2e
 37 a17c2739-2d5e-6003-9c16-cff21f860f48
 38 27209260-3781-3a5e-98b7-517e5e73b8ac
 39 8c499faa-ef05-4fc5-a8d7-14e127ac0e19
 40 94b314a9-ad39-0f0a-bf65-0ea645f7a745
 41 de01c904-9f7b-3ce9-a34a-940fc869d74d
 42 05dc7d54-1d03-3e4b-82df-94b3c571f759
 43 e505ddcc-5884-2dbc-90c4-71c5164ab432
 44 c9342558-0636-80d7-b048-24ef93afa145

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 38061722504440601747710513434712871263403328. Exactly this sequence comes out of new Random(474).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 54 of Run 42 (seed 983,934,859): new Random(983934859), 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 2013-02-13 10:26–11:32).
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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