201303020032 19id6d

explained decrypted filler

seed 51

Metadata

Post ID: 19id6d
Title: 201303020032 → 2013-03-02 00:32 on A858's clock
Posted (UTC): 2013-03-02 05:32:54
Timezone: UTC−5 · title 00:32 against posted 05:32 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(A858DE45F56D9BC9201303020032) = 64720cd960bf8d5c6862cb344f91c36c (name+title)
GUIDs: 44
Filler GUID seed: new Random(51).Next(9) ✓ verified
Run: Run 42 (seed 983,934,859) (seed)
Draw: 118 · 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: 1 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

672B25D7D2C17046 B759189CB0664C49 E8AE0DF3BB477D23 7E737CC3C262BD8F DECCC4C4EB7210B9 211F74F1F4C91310 B763B879E7BC58C4 95AB152C06434371 FFAC20118B104D42 23C5C026F1FCD20C 05EAE7C60DDCEE4E 05C33F11A3DFC69B 45917F97677358B4 612887D15D726EBF 798D663BA5D2C778 C170AFB193DE7F04 961A0A5BC8E59C49 1B356972FAC93F49 71ACCB0E8E564AAA E7CE20F9664F82C4 83491E642AB9E30F C210E3BE37473047 C62A50674E04DE4F 9AE9DD8879C6A6ED 777213DC21388F7A 14BCB61A07760C97 9B9034ECB3FF6818 73841C2557EDE48C 934D065378A7DF86 356D3253110A5582 AEA3DF0F76A5BB54 EDCAEAA176638979 9C08805D8D4EE8C2 7585CB3BF73DBB04 9E3514765EC9C9BF 2EC467EC91C7BD35 3821F77A08E4EBC1 01A5AEDAD771E894 824A9E1093ED0203 1B3010360FFFF30B E37945BD423F83C8 70F87FAE49E3A084 22494CA9AD4EF948 A138D6CDE158F61D 386BF1AED8DBD93D 5B08DE44CBA67D0B 273262EE1FFC53A9 73E2A7E973937AAA 31CF30D7C83755B2 3987734870D2444F 5DD9EDD727A44285 57DE1556DC111493 801825AA31BBD98B 86D1AFECA6F82FBD 853DEDBEC3CC5800 E769D45351586454 2B8235E9B7D05656 D0C17F62D5BA8D05 E8C798AC4EC21443 52BD0E80999B61C7 F3CAE6787AD87879 12ED4AB9C2C5B334 36A1BA21D6E77B11 887320F305EE095E DBFE68D8708AB083 12C607B2FCAADE1D B6867BEED6643E2B FCBED9ECBAAB3BAC 70D0B3F99FA8C6F1 5254F53C478B19E4 7112D908C3A4778F 26A99557263AC97E 65E22DA8789AFDA0 FD99115F47AD1517 7B4D228F424C7CC6 946612343D58C8C4 68309E5370B005D5 1EDC6D0DD0172866 6EDDCBCD38A85CD8 B77AE06C7795D530 C3CB26BA38479679 3335E8462BAE427F 2CB8DBE32FEBFB4F 254AFB7227F8C8FC DAE937654CC9BCDF AC06413A0A402F67 B969D8352FD560A2 5B27226607674ED4 92F4A38DA4E17DEA A1A64D25CE8838B9 808620F73ED72826 3848BBEF0E4DB0D7 088C20C743C1AA3F 4EAE715857779251 0A28C29740C5B930 7638F6FA432FA9FF D88BB512FA9ACEA8 6A12900CBA1A1B16 722C42F7F85CAB4D 82C78FA738A7B315 C0E418E77DB4B43C 27D27DE0565952A6 1456100FE0F7E120 4510E9BC82FCA099 8B5E86B5DE0CA0A2 F25155393686D7B9 D1439F1A55E38094 724D59204FAB3EDC 12F2C663C2CABF5F 84984AF0E610AEB7 DF3C9F5BCE1C45B8 83CCA55FC86D35E0 215752EF9FE76D52 7BE70AD9EE1109B0 427EB4C6ED3F4EBD C018B98170E7896A C49626ABB563C1EF D492635548A1800A 017E168B65A4E705 F619F18B4E5B6675 881794B35DE85F5B 8C0612172C9362D9 9ABDA0E5D82E024E D4CFB7CC6899D3B5 1F9C895EE941DDBD 992458368DBE8370 8358400CE386019D 3DDC7D143E4A6A79 7604F7CED2272F16 19CEAF952E343596 B5C3715F342423DC 5256464D18A905A1 E73F7F29CD3C0112 66B4212475487AAD 07CEC6F0EF359945 E227D149AF24A018 1957C4EE262589FD F0AB4C5F5FD6F069 5878E5A13F6D8505 79807C9426E075ED 19A82EF8F6E7F3AB F5E652E9DEAAA430 652A36BD95F5D19C 989881AB44FE8EE0 EE3C1B727D9D6341 B7DF67A336192573 018EF0DF1F227CF3 A8CF0AE35B76340D 6A7E133A2D31907A 905965BA908ED1DB 7C6117D57F8686E0 2D40CB623EB790D0 575DFAF6EAB14AAD 62DB4335B83F4C46 12CEB20F4902434E 52408946EB15FFA8 CDD49F9D18D0BA8A 55D0377CAD96A953 887AA0D348D250DA 6386AFB79A8A082B 3B3D7DAE7EEBDCFD 3B73D1082612ECA2 C27FC8AE8CC92B3D 3039DDAA521965B1 5F173C1144F53A1D A57AFB8B264D4227 C43993CF5773A959 1F7E96F64890794D 78AFE06B37EBCA1C 111A4A91CD77966C 93593A65BB96385D DCE6CC39AE800C67 11B4416F60F196A1 E76371AD5022EF01 BFE8198FF69A121D A475E0EF3D676CA3 F7EC9685AAD4734F

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201303020032 (name+title). Key = MD5(password) = 64720cd960bf8d5c6862cb344f91c36c, 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 37a3390d-bb54-3d72-8df7-e01092874cdf
  2 4dc2974a-aacc-7f5c-979e-c16673795ac4
  3 32da7f77-c318-3ed9-9dff-8e449d1b3071
  4 565d08a6-ff9d-39c8-92c0-db4185a46c80
  5 99c65ef7-8bbf-29cd-b117-a48568a85e1c
  6 fc681e43-703a-1f49-8ada-ee85fd77d339
  7 ea88ecbd-9d21-6420-b132-95705f8bdaf4
  8 04635995-cfec-0dde-98d7-c3c202cc262a
  9 f5c8ea50-7f55-2b46-bd9a-bb80f6c87937
 10 83e39216-e32a-0d8c-ac18-42688b6d7f8f
 11 89e47681-0d15-73db-b3c7-c5129407a458
 12 e8926395-f321-2baa-be22-ddffb192131d
 13 48b428e9-8736-606a-b8b2-8e4a29d53ae3
 14 076054af-9c73-0e3c-a28f-53f05f62e318
 15 cae7e6bb-d777-6ba4-b2df-9b72e88e4220
 16 c577cd90-f88f-73a8-80f8-d85cc413a290
 17 581171de-f62e-2a98-b87c-d846f58d72cf
 18 7acbcb6c-6cef-5a31-960b-fbb2d37c1280
 19 b72d6979-c4d7-0769-80ab-4466552fbd60
 20 2da60448-2628-0118-a4c8-52a99aebcca9
 21 662ec7f5-a8ec-58a5-ab69-02ff29d5f447
 22 1ee904ed-3d3f-3062-b816-bdf385fe0602
 23 dffbfccc-5c0c-54a5-b992-47a819b4e2d7
 24 a66a8d99-64ab-746b-ac95-ab4a80db4530
 25 215c3adf-79ae-6763-832a-858d1542b378
 26 3be17ebc-94c8-2b06-8abe-7cd948ced243
 27 1622162e-f7a1-7405-b160-8a8f55e3a1bb
 28 335ce10e-1dec-2410-bc29-3f2415849c88
 29 e4a83c96-cd14-5ebc-8bc2-347cb9ce8150
 30 17e1554f-1e9b-169e-b36a-d2a34a33d4f6
 31 bf9b7a99-64ad-09b8-a637-5aa8bdf0a693
 32 11fd189d-3bd7-7321-afeb-7b46f80e247e
 33 1ddf5bbf-88e2-73c6-a46a-ab8d5403b712
 34 d4da2ab1-e001-2aac-a08e-8c9020f2ebbd
 35 a2ffb4e7-0333-446b-ac4e-664f03968232
 36 1fa8bc49-dbb0-82d1-b72f-3d0f8060e007
 37 2572bba5-b041-22ce-a352-a318af7e49c2
 38 263530fe-f844-1fa7-b7f2-bc9e5a69a384
 39 bcca0d02-3bc3-038e-8322-7a3c96015b32
 40 ecf9ac49-5d76-803a-b431-35581d27e7c0
 41 8b17ff48-2c7a-5052-919d-8fd30fb1958d
 42 a46d5dd5-9781-7559-86ef-aedcfc0bd081
 43 890a24f9-1002-2036-838c-e7f3b4821088
 44 0689b0fc-04ab-0489-b138-535a3e8d4581

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 37332160207260672500535762725107724821085720. Exactly this sequence comes out of new Random(51).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 118 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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