201305171007 1ehqhy

explained decrypted filler

seed 755

Metadata

Post ID: 1ehqhy
Title: 201305171007 → 2013-05-17 10:07 on A858's clock
Posted (UTC): 2013-05-17 02:08:00
Timezone: UTC+8 · title 10:07 against posted 02:08 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(A858DE45F56D9BC9201305171007) = 7693758f018cb077e07e1ef5556b97eb (name+title)
GUIDs: 44
Filler GUID seed: new Random(755).Next(9) ✓ verified
Run: Run 46 (seed 39,043,781) (seed)
Draw: 32 · 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: 12 · 1
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

D27730BD38F85DD7 797350A1BEF59902 90056CE58B89E6DC 06AF1CFCFA6D7D9B A35D7C0EEB84C290 E795F5D9992AB362 FF26FBB3BBF94F28 4222DBC2697986CA 49100A5133505135 A56A2AB548050767 F20D377F417DB294 5B7CC329A5EDAA81 CDEC8DF2A6BF4526 E6520DC91D21E123 DAC43BC6E0A40E0C 107C1101D6B2D9E4 D365B8848B5BA43B B305C0F378A26065 B6BD64CE053EB965 197BD4CD598CBFF0 B964703B07822F9C 9C128E562F59E80E 67D11DE595095496 11D2476028D34107 AA1277DA99C95C37 D57128C2D978435B 3425FD0A742B759A D3C5B37998001E23 58737D7EEBF751D4 E865BBC67500C3FD D2CF46E63CEAE6EB C3EB7E4149CB80B6 AD66BD94822CAA2F 98062B60993B7A34 51F2D60B7FBEC1D6 742B040DD6A6EAD8 4D982EDCD2623093 B90BDCBEEA14BD4D 9E75943C805866C6 72F2B9F2C3A41549 DB5B50C7670D05AE 9B2893F585E5A209 1E8CCBC95750DFBA 1B43F25F6DF7C12A 238995FFA7EF05FA BA4358A66C0D6D86 5EC9304B1F4456A8 E86A8EB18B0BDD40 1F51B0E1137A4A07 D547F9FE774F5F3C BA00C6BDBA701136 E27723F9D8C26170 C7D7A864B9528E13 73CAAE6F6A19D1C3 5EB2E9A0F162755A 2F7AC38D11FA4A14 8EDD2F9C3116483B 8387A5FA466EA162 A69331B254F4B96E 8AD4F4D8DB02F647 13465697B4606BDD FCD5C4AF86972037 957D9EB229A3747B 48570A8AFB91C0F1 C091D6F65371CB98 DD22FF2FA0A02FAD CB98B6E2DDFC2004 37ABA78EFDD6E3C8 812DB276B1303457 BE0CB3A515ABBDDE 663C8F8036C54414 6B4640885353EF40 D9B2AA37087719F9 0E5C60DB6520D8D0 EC67AEC5C1208BE8 2A950362CECB3A0B FC703B9BD8859114 EC8E5AE57BB68688 6719359160FCD9B6 FC57EE3089DC6E8B 284DB58DFE29E418 D5775E38396D36EC 9DCD6D3077084255 CDB5DD8DAA6E85BC D4A2B3528CA2A46E C11FD10C62AC348D 7202D91F40CED9C2 CAA8E3FF146ED713 1E0650F4928E24D9 48C775A78A1ACA87 926572B7188664E7 42CAB458ECE4450C A95E5C4B2D6354A5 8047C49226631442 56CDECC976D7C63A D342A9B35334CB96 AB8BF102A7148EB9 0AE3AAD8B49AD61B BD498E6234270191 08284EBBB30AAF50 B2D3760EB5A27573 1AC10A1DE0E96AC5 FA03F4433BF39D3B A4BAD8B54900160B CBFFA326D4679033 9D64D4180588089C E61B8FF19ECDAF93 14A449F072DC8453 6AC586E320B575AA 409C96F14730C5A5 FAFF4FBE489AB55F 1AF8344BCA46F641 73188468D82CA886 FC68F46F435674F6 7FBFD5C85AEDADEB ADC7374092379661 7AFFA3EDAE894332 4DE2EF1A2C38C529 286CF9648B156B4E C3BB884E2F38197D 040788ED2492B50A 90CAD41F1AB3CEF7 35B270247F87488A 0F1ACF3FDF514F1A B779FDF2BD377CEB 2F2CA63AAE6C65F7 D7D0945C79063585 54404FC0F3E5F028 8C9B724FF4890342 49C9C9F3607B1D84 FE731ABD3C969C41 28DCB64A3246DB2A 368F8D17CFE436F8 B69BE695E9C224F7 81D0A7D56D2D7EED 59F7D3E7A2D3195B 359FC8751566284A BA8B54AFA40753EC 4B0A368E632FB6D4 B05698E80741A8C7 3B3538C37E02E9D6 430F3FB43C6ECF00 36CBC3F64F50DEBF 34DC4FAAF13E17C6 5BC0F6500CDA94F0 1DC0944574229ED3 BB5D3B2EC38A6257 CA55C8E5B3400648 4F3E54A2B0AD4B01 CBB588B6E2D105FC 280F67710D2E525F 558AF75D2EA34BBF 451A13491CEBF7AD C1B3CEA4CB6DDE6C 00BADB48A31CD282 30457153E7F6F9B3 3D9562DDBD9845FA ED50D6B7627D4B31 05507BDF27A82602 17A7DA7B65CE1219 BAF4BEB5A4130942 21350F5858C75542 8ED5F64C3A958A25 CB3AA7B7CE56BD5D F5BE4BE17C28ACB2 788AFAFE11B83C18 6430C6B7DBB4FC59 E3B5DEB502406651 059520BC67610956 0D309D0B84BE6343 E0343F05E722E5E4 01AAE3C75F9FC281 29F5ED95EEFBB4BF F8BAACFA41D75AC0 DB7AF8C8C8BB3F15 D5CACBCE0BC9F2E1 3E584BD52EEF189A

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201305171007 (name+title). Key = MD5(password) = 7693758f018cb077e07e1ef5556b97eb, 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 70ca9dc6-3453-10d5-b358-e6762f54b5b8
  2 4d52a0da-a519-34ad-8e54-fec429e45135
  3 851d9904-95ca-4a8f-ab49-e01fadcd987b
  4 6ee2f61d-cfbf-6140-8119-5cdff9a2a7f2
  5 c2f9c1c4-2fb5-0ead-9efb-64b234499824
  6 868b9d2d-962a-32aa-9a69-87e42e9fdcbb
  7 150aadce-debf-169a-bfaf-69fd2d55cd12
  8 703d0281-a9a2-1149-af85-d9fcfff19417
  9 da361feb-acb3-39cd-8470-0c7b96070166
 10 8b65ad6e-ee02-6ecb-b993-aa86767cf6e7
 11 ec6a61a7-3166-47ac-b662-0df69dd510a1
 12 e3d64688-e4e9-8d98-94b1-d15df30341b9
 13 2ff7d839-1b0a-5e93-a16f-8bcfedc35db8
 14 f6b0c862-5e09-26e3-a6ba-6f32fa0ee287
 15 9eed90db-606d-47ec-bfbc-e9142962db0b
 16 14362d2c-248a-4fab-92af-df9ef746297e
 17 1e7c27d1-ae3b-2327-ad18-91e7f3968ad1
 18 aa609f17-60c3-0ccc-a53f-5e226e688963
 19 bf1329f6-12cd-16e1-b448-098f156e6edb
 20 df6dfb31-83b1-5b54-88c2-9fc55b680505
 21 0aac15eb-f730-19bf-9c20-dcd8dcd56dd5
 22 f5378450-a285-08e6-9b79-5c21f51f6672
 23 bce09985-2a2b-5d71-886a-212414264914
 24 2d4b313e-7908-7eef-9047-20b9df4f01c9
 25 6926e2e9-d326-6a45-a542-cd2ebe82d2c5
 26 136b7598-a128-1fcf-8e97-eb9f5886cd2c
 27 671bc3ff-47fd-0965-8a4f-f960617746b1
 28 da57aa36-421c-410d-8e09-5759129a69cb
 29 a3acffe8-12cd-0e41-b624-cf3aeae7dc02
 30 8495be91-53ea-17b6-b089-899a0d01456e
 31 727f187d-0c19-89d0-8723-eb0fe67d30ca
 32 2fa93de6-a87c-22a0-b393-f25ef4b7c9b0
 33 21631761-d5d9-8a26-8d76-844cbf3d999e
 34 05ce7e87-efc8-8348-a456-cbfd60507b0d
 35 1a443c54-c753-27c3-8e39-87559c0b0a24
 36 9530fce9-b5ff-478e-94c2-adf3b8c80bb5
 37 e81cdaf7-b86b-3b91-af4f-ea9ec27ee4ec
 38 288cdf4c-afbd-88d8-ac5c-fe4005483f50
 39 606276c5-6259-5ded-a023-26e67f6c3c27
 40 0592d35a-b070-58e7-bef3-b7ae716cb800
 41 4fc05056-1a9f-1062-ab97-54cb6b2bca85
 42 39967dd0-c3de-4189-ac69-a371264add2f
 43 19a12fca-673a-084d-9c50-bf63b85ac290
 44 2d3d8ae7-f886-6c00-acf3-d2f99f2591cf

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 13460311364852442015105761040182882438551406. Exactly this sequence comes out of new Random(755).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 32 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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