201307210955 1iq4ju

explained decrypted filler

seed 711

Metadata

Post ID: 1iq4ju
Title: 201307210955 → 2013-07-21 09:55 on A858's clock
Posted (UTC): 2013-07-21 00:55:59
Timezone: UTC+9 · title 09:55 against posted 00:55 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(A858DE45F56D9BC9201307210955) = e6250198116b8768d49f82b0d47f593c (name+title)
GUIDs: 44
Filler GUID seed: new Random(711).Next(9) ✓ verified
Run: Run 49 (seed 822,652,546) (seed)
Draw: 58 · 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: 3 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

54702D3B150FC814 C551C057250EF6DF A5A1572F187DD97F 3C849E249619AC15 687900F80E6F1B60 D8228551EF91C639 7EE35394ECE3BE27 6386E493C0D662DC F415B6A35ACC05C0 B1E12E0E9D428F1A D3FDC1D2BFD50A05 6DFB09E92412144A FFB7BC5B3C039042 019B3C53F66A5114 CFFCAB21472F705E 3B9E4F1C688E5FA4 4A964A76A680F6A9 82F33106E64AF731 DEB2661CB0526173 082A08C3DA595710 8F95B8961DEC0573 D7069A10A21C570C 476716963F86BA21 390EEE12EA60ACF7 172E77398186F779 D0E69D1C7B7D4334 E8723DD70D5CB1D5 C151B3117A373BC9 4B71D6EEAF912700 00AB29246B12C73B 77A85E587DB64DAA 5BD863B5551562CB 760F0695160F8713 EB5B2ECD37993683 7A099A1F386479F9 8BFE0B3A23899684 36B041C75B579846 B4D74E552AA3636C F8B415CA0ACB61D8 04E4F6C8E49BFA63 D52EE76D34B18377 93547DB58B2F3AF3 9333FE27C3424F6B 4A07EBD5FD3D8E08 26C765C38CEAA901 0FF6BE1542F1CA41 B44568C9B70FEECD 9636CD102165F692 3CD8502B8F1EEB3C BB9D8E3C053E4B37 6AA2B8683920C576 B4A1FA907BA6DB68 D475C56D546F621A E05D262EE7D4FCCE 7365E117AA799E73 7EA2EA2CD479507B B009A86F0F73D919 46CC7B36618E94ED B44615FAE00EAB52 9E62CAF9022374BF D7DB1774E91237C0 2AA911E7F60C1BF6 96E064A21738BA80 8F44E5A0526A838A D69A90D2A700FBBE 5FE06C1360A85DB5 A830E4906A0B62FD 09131C4FE188F34D 33AE10213973B7F6 FFB1A721C3B352BD C14A07D542FDDAD6 94E256F3BA9271FC 26CEF3F923408C70 2A9B5F51A2862452 18082191673E92FA 941F86698A7261D0 FDCCBF15253E0F48 2F45B356569C5ECA 2D6C8BA891BA5C07 E54B445DB22F486B 76DCDB73F58C8167 BF8C7ABDA86C525E 3CBC4AE2E5B75D52 55BDD87BA473CDE5 9FF3509AE54D0CED EC1DA0A0B399F916 FB3F1CEE74A7C6BF 802CB4769227AAFB C36DB55F6310D8DB 4E26E5F0C7A25B6B B4F5CC8F9D0BD554 CABFBE04E5E4B6F5 99F140D66DB2B4EE 6DCDFC799360AFEA B244BB5E51428FA9 1DCDD18FA3205742 C8EFC3AF23319772 C558539A8DE56901 C1D93AE13D667319 5C6F817590FBD4D2 C9B2EF2D06164803 ADC7A516D772092F FC3F9B5BA3B775E5 F3B3C2DC75FDF902 C4115215F101179D B28E5FFE5F176E15 65FB22206670B6F8 085F182B53500002 9260D27F37F34DEF E25C20EA5B7F21AD 606A26F54EE646BD 95C4676524FA084E 7E33D1D7E04C2F38 89073987AE9B19AC 11E0F39E2E3A6425 443291F0616CF5CD 8D8F3D93053A4E08 0CA04EAD0B3EACF8 3B2E6A0733935603 622F51BA0426AF25 3CA41EFB52EC833C 791634C62BCD9D2F 5F79959342479999 98A72A2B352A82BF 27B6B30C35F9D14E EF2CD1F7DE5DAE70 5EE74D91406ACA87 8BF1AA36CC39A17E 24BB469C48ED84C3 40492521DFBD5165 7B9D71006EFEE558 51198B4230921751 9937223F13328FFC 14A57ED16E9ED6F8 84327D640A61DE5C D13A6C3CEC5BCAC3 6DA99559D53F7A43 119193F7D594B569 F4F8C6EC26EE04A7 292133F10C90411E 596C3CF45AA73835 97196C2DE255A863 17E9DED7A1AD6B52 E11425AAB43C2195 F3CBA4999E7B1226 FA5E918F01F5C84A 2D588C4761346041 95ADFE4F96EF95AB A1891F4CB26C62F9 5CAF3FB8EAA34540 7D523AE230C6193F FFD28A18BBB8632C B9961EE3DA3C1D34 A8BA37C5E4074620 82D8282340CA941C 909E8FCBCC2D1A58 4513EB2BCAC4DA61 1A1448B4EFD04ADC 50164007DC49C3FC 0B9B0B86123BA08F AE7AB0778E64ACC6 1A374DB591BBD258 69C19EEEAA5EED08 1EBB3A218676F086 5FA098474C7D0358 808AE0BD3EA0903E 610DF279B6B93400 632C860FDE7F8513 FEE4FE8BEFC5FA86 EAEB34B7031A06B1 C66CF89641549622 3969D4150BCA843C AD9CF94E1B79C8CC EF4D1D51248A22A2 BD8433E5A9D351AD 8EE4D741B165119C 19162E31F54DCABF

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201307210955 (name+title). Key = MD5(password) = e6250198116b8768d49f82b0d47f593c, 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 30bb0e11-974a-17d3-896f-8e9bb19f4eb3
  2 26341a63-939f-3aa6-aafa-fdcabff6a8a1
  3 59ae63aa-ac34-6dc2-9f00-1ec27bf84894
  4 89914e2c-549d-20f0-813a-0125d73da06c
  5 8723f98b-d7a7-1f2f-bf73-2abde68ac379
  6 c2b28842-d5e6-896a-9436-b411180dbc42
  7 9d7b07c9-8870-4d16-906c-92a41b5810fb
  8 f4309c3c-8189-1d94-bb2c-51a5044c5fcf
  9 2fe63c05-4c56-8d39-92c8-d5a1565594e7
 10 03bb5a20-33eb-4812-bfcc-c77633b8a498
 11 09359fa5-f097-035e-96a1-5899dd4954fa
 12 91b2811b-2b23-4ebd-9d57-97587a049ca7
 13 847ffc56-84d8-3b89-9687-465abe6a3987
 14 9cd1cc83-86b4-31dc-bff5-2e6db0dec7b2
 15 b3a46ae2-cdc8-5961-b0d5-64f0b77ee875
 16 5eae37aa-5bfe-0d61-a374-045c4997cc3f
 17 c41d7602-4bed-6128-bc4b-9abe1eecbcb8
 18 cdd1aa07-408f-7b9d-b305-b34a06ca40a1
 19 081176bc-682b-8aec-9359-abdb89af1499
 20 f3d7443f-fccd-5f17-8f94-b2fe0d492e8c
 21 ea525e6b-7c4e-2e68-a29a-ccb7de8fdf17
 22 c02cbf2c-e723-2680-9d9f-6e5b474569d6
 23 da891b9b-54ef-14c1-a848-4c0bd34d700a
 24 4e25cab4-beb5-3a69-8e5c-462c244164e7
 25 4abad418-33d0-3c44-9dd8-f1cfbfb78f80
 26 358a5642-2750-7a97-a4a5-82c4e38351a0
 27 892f149d-e4d2-2d03-a100-ff843f131d2b
 28 46774aff-e9fd-2d6b-a6bd-fbb9dc305fbc
 29 2aaeb6fd-5dc8-8f6b-8c88-f172441060db
 30 d4a72285-e916-63b6-aa90-5b8ed3d9f103
 31 28033931-8f16-6218-91bb-2decb22a89e8
 32 767bfc4a-7d70-699d-b6c9-0a3f9f651702
 33 db076485-0e5c-1f92-b5d7-de493ed48223
 34 467d8d60-af70-7692-a35c-96e1a2a58d78
 35 fd70f700-6e29-8235-9533-0cfdbaf872e1
 36 9ff63cc5-3269-59de-b635-6afefe010f19
 37 b6bcb4a7-aaf8-8959-8680-b2bad49ce565
 38 043099e9-8b9f-8e6a-9b5c-3ceff9df8d1e
 39 f4a20e5e-9afb-0783-9ba8-1b7d4b2c6663
 40 361089de-ccde-51dc-98c7-527561d1b75b
 41 0f6ee21e-be33-3cff-81dc-936e884a4dc4
 42 72c1e225-5899-2bcf-b14e-ad92351c1e24
 43 7c2d052b-01e0-8d62-b339-d9ddcd5b7696
 44 2c6d01ce-9949-6ec9-b1ee-a477ff0be308

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 13621841840433506785221337228666178588053286. Exactly this sequence comes out of new Random(711).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 58 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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