201307230950 1iup16

explained decrypted filler

seed 678

Metadata

Post ID: 1iup16
Title: 201307230950 → 2013-07-23 09:50 on A858's clock
Posted (UTC): 2013-07-23 00:51:00
Timezone: UTC+9 · title 09:50 against posted 00:51 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(A858DE45F56D9BC9201307230950) = da593e7f353e6a082dc52d5c8451d814 (name+title)
GUIDs: 44
Filler GUID seed: new Random(678).Next(9) ✓ verified
Run: Run 49 (seed 822,652,546) (seed)
Draw: 85 · 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: 2 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

272A3097C95F1340 7FE1B91CB942BA3C 8EC705BAC1C8BE81 08E889DEADA3176B E8556C72211BE7BD 307A23C0AD21EDD6 8E0FC9DE54F5FF92 D1A5B431456767CE 3D61150F8DB19A24 938DBB8D5928DE94 A76BA3743A2C2936 86F626A0DF807EC2 3E7B8922252A6A42 767171F2C31CA927 457D7294942CD237 F7DC16D643096925 B284D3575C6A42B9 D0BB878B7F5BBEDB 8AAB31704B5AB14A 58A935743B78CDBE F024D8B6A8DECEB9 6EBB828D055B8510 D9A72A1FA67F39DD 6DBD7AC2B785CA1C B1A0160B4257E87C 21BB279E5AE2E001 84D4DF513BA8EA44 0752F9EB4304E1F8 60D6E6E0A6B58337 713EEEFF11C5EA9C C58FBE918A822244 2442CA7704013637 50514A7D466EE4BC C6E7C2CF99E3FF8E 30B3091172478883 B4B33236530925FD 173647601790496A 29DA4B58A176660E 8F64C4E0A7C8EE44 A9BC0E7D56E57D84 89BD2DD21D2B2A87 E8C44FA46116BACA 6B5B359E72CA0CA5 28F35B4D1C4B7A7C 00EEC462F4995002 5507964344105A00 2F34EAC55DD4AE98 BC64E49F235CDCEE C1AA125BFA9E5EE3 155008C3A57A68D1 7120B4DF61B43477 F51BDC840508294F 93B69CB419B920F7 5C8397B80071FAF5 2A3B27FDC1556360 7F463B4193D2A8E3 38A31E539D358262 90CA7354B2DB6789 8572C0E4A4D94A90 DF274D24DF2A806A 53C1434C94F5C1E4 5A7010441070468C 9506D7D32D2E4519 11E7623ACA422E71 D5D1CEA23FE7C053 C10C7C05CC98DDA9 D4FC7EC062079DB6 1EEA583CE0F6E6B3 F5B59E3B404C0041 AFEA2C333A2550DB C20B127501335242 1EC1209561FAC38C 9960A0AF7DFAD667 AE70C10539F34447 1B4C18D48259FC36 C4A5E6908F351E59 C3D2A22A60C8E27C 6D86B5C08605A744 0C0AF811E148FB81 23C23565B49D80DD 1BFAA440B114E8F9 8823B5DA12AC60DA 62CE4A81264F2399 28B6282E14AA6801 44D59EDFD1CC60E2 C32C5020D86431C6 8037E15CEF0E2957 CE676D753BAF44B6 B0113D753F2679FF 31B0FB1BDFC0FF0B 66FDB80F4BB4249E 0E1D6CCCD512B890 3509259FFD1C6651 9D1F3B022FD0EAE6 B9AE40669C341DF8 164A81E844BC867E CE00DE154B0CD9F8 6B831983F85871C3 D55D8CC388B95405 B1AE4568D6590981 52A6B195B67D3F7B 8EFA7B930776DAA6 9DFCA811914BDA50 6BB8E72D0324BDA8 3C857D67BA1B42F2 CF94DADBBD0812BE 60BD5205456FF41C EF24DDBAF709D934 F455BE14CD4F40F5 BC89614FA1CDD70F E7DB3F9F0A3E52FD 9D50C30E378CDECE A230DD1A4ABB538C 8150F3725474B4DC 436276DCB61AF2F4 98B9352E2B47C648 07445CDC495F3E37 BE668AE22963CF8B 5E1C41CEEF530ACB 3743BD9F1041E417 AFFF5253D5396EAE A51D92395A0FB99E C42D0F38887EBDED 8C711E8DE4EE0B03 16332B6C9A8B457B 4E6B91EA0359D5D2 C96C613267F31255 1F02D63D99745A46 FB65712AFC6CB63A F30A68B1BAC81F5C D9E41183DDF2ECA0 D742AB04848617CA 152F008E1912DF82 E1AFDA5987D98BCE 57FCE5B8756CD866 BDE2D72F67D7EA8F 9AA300A014401055 C0DF975F3015C08C EF0F45A0924B3084 644F6CC54F937B59 A61D4BFF45144227 2A5ADCF66349F524 BFEF18E60350C84E 97E8A67C5C17553E 6EE3E86045A31A98 94525BA814A10E15 36EFAECC6C6F1FFD 108885FB38D7FBBB A16A1978ADB50DD1 BFEA7D998CC8890D FB7930C5DE41F48D 265E7BFA937B1932 85D7A4652420133E 1D44160FC6433D9A 4103E7D7281AE299 1D984A56C2010B40 2CE7B3DF0E2DABB8 5182A3B4250A51CC BD6DB29375D6D768 0E89B9E133243060 E75C8A9AFCA2CCA4 B3BCBF6452653C91 C567117EF28A03B3 3B68B95D96894795 A117205E76538198 62FEB754B7A1D30F FD6A1A5DEB0258BD 2F927D52A874CE9F E5C7719C9A57B075 2561967FB24D93F2 5D81D6AEC4BBA7C4 B2A3F8260A893742 E42CF8D765BB7188 CA8B9EE71E1B2822 675F25DB1C15CC6F 2B395E6BA1E70173 AC119A167EF6C63B

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201307230950 (name+title). Key = MD5(password) = da593e7f353e6a082dc52d5c8451d814, 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 b5fc7b62-e788-8c42-81f0-ce2890dc4de2
  2 105765ca-f2d9-6d00-8e56-ebcd09a2e0db
  3 acc0dafd-dd5b-6545-ba6b-87852b70acf2
  4 05e252e6-b4c0-2b89-bdb3-5eef2cb71776
  5 877ced56-1354-2d34-a886-c2c3f98c5b8a
  6 9250c9a6-65ef-0eb2-b70a-5263e0af811e
  7 d33b231a-db06-603b-aea3-5d8ea2df1030
  8 63e80f0b-baee-54fb-a9cd-ec3eb20c2110
  9 d4c368c1-d5c1-7cc6-8b22-f417b0bf0cdd
 10 5b7d8b84-9a3f-2800-9b5c-9e0206faf582
 11 c4f5ee2f-332c-7ca5-a8b5-66831b0410a4
 12 e3b50ca2-13a5-7542-96d1-b070779f15a8
 13 b2be4b49-bd50-6a37-a85c-20c64f0170f1
 14 ccf1c60f-3cfb-1527-98c0-7193c2daead4
 15 533f5209-e097-55bb-8d80-72a54c773542
 16 a4c062d7-8e5e-4805-9231-6c9212041bf6
 17 5328fdd4-4d7a-7b59-b01d-782d1fb77bb4
 18 90de252e-54e8-3d6c-a9fe-bc2a3a2fbc89
 19 c74185dd-8772-03c0-9e5e-66de0ed55002
 20 4322bc54-f906-7eee-a2ab-bd53f5fca2ca
 21 9f360f83-d08a-873c-be04-47c39a9b2e79
 22 9278a23d-d4ed-14f4-af4e-df68596f9913
 23 ab8fd916-b66f-5423-865b-f653631de1a9
 24 a005ddd2-b2db-80c7-b067-94ef0e44444b
 25 7fb69805-04c3-1c0e-9a39-f7a6107bac1d
 26 e595c37c-0cbc-5023-8eec-91d3d69456e6
 27 f92ecfcf-709f-7026-9c55-3de868cb1af3
 28 f3db9dfb-85d3-746b-8c39-85c808e64e9e
 29 004698ef-86d6-7899-acf4-bf696bd4819b
 30 df641ce8-fa9b-134a-9643-d4e264739c66
 31 ce0152d9-8965-4a9f-88db-274309dd45f8
 32 f95e896c-757a-06e7-a0a8-4dfd7122c516
 33 170005e4-6fed-8464-ae1b-affbbd33fe1d
 34 735f05cb-9b8f-89bc-a473-caedbc38b9bc
 35 370dd23d-3271-3a2d-8068-5f3e19086237
 36 43ac269c-22be-196d-b85a-bb9d5ac53a39
 37 9ef5cb1b-585c-50f2-9dcc-5c92148a16b2
 38 4db49d5a-c55a-3f16-b650-29b445ad8f65
 39 fbb34bd5-9c43-47d9-8052-af1d309abac5
 40 5f055396-2e1f-80ac-871f-0e0732c432f1
 41 ec613d88-c5e2-0ebe-84ad-af8f92350b39
 42 05256d4f-044f-07fa-95cf-7bd8efe279fc
 43 870eae86-f215-03e0-8c54-a519287dae39
 44 7cf29a61-32ae-85ae-81e8-25cd68a0e5c4

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 86622065727761547307815815777140883153480008. Exactly this sequence comes out of new Random(678).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 85 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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