201307210929 1iq2zz

explained decrypted filler

seed 739

Metadata

Post ID: 1iq2zz
Title: 201307210929 → 2013-07-21 09:29 on A858's clock
Posted (UTC): 2013-07-21 00:29:59
Timezone: UTC+9 · title 09:29 against posted 00:29 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(A858DE45F56D9BC9201307210929) = d3f4e0e98ac13845ab11ee01eb221f1c (name+title)
GUIDs: 44
Filler GUID seed: new Random(739).Next(9) ✓ verified
Run: Run 49 (seed 822,652,546) (seed)
Draw: 45 · 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: 5 · 1
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

23C1C53712A11526 0C4EE17F5818FA0F 0F7BC6F8AF692437 9BC8BB36FFE9187D 2328B04CB4364D61 80B871EA899B8CF0 33E3181CF66659E4 5E5F18079FC66DC3 E62831780327D616 A7BB5A2C59070437 0FE9797C9EFA3FF3 2F18EBAA743DCCCA 3DFF742F9CEBF137 4307C23DA660BAA0 698D693A6FF23006 479D338922946490 AC2B577DE2C2619B 19CF5313D6AD4600 24FD6CD627823954 86025EE4C82A9A58 20F2926F960545B5 8B87D4A83D21D74B 9225DD106AB9D9EA A9CAB45CC411EB33 8352697A021610FF FC58ADA763326335 9692F779FA78870E E8C95A7D9C429AC7 5A7DB7383307F545 57FAD776EB876819 2AA83BC184F0A285 D61681B62C2C61E7 B91757DE3F647FC1 849ED06A0003621F AC886A70D19EEC2F 13873242B94EF473 83223584DE486926 6FBBC5B96CE14BB0 F3852FCCED71435E 9F748D00910ABF7A C388033FDC08A835 F6A9062621A99C36 0EB6084A5ACBCCCB B961D2436FEE0609 1052D31D35DC14CC C55AC8CB1B6E11B6 0BE024651D38357F E5FEF6FBCA9FA3B4 FEFC2348DBAFD54D 3091888431178A73 1490B776B610CF7D C6138FB5FA2C6A48 8F9C97137BD2FFAC F590BAE0F9F3F838 04CF823A84DB5A72 D8504E0FD5CC3864 DAF711D527EAB973 2FF9AB376109BB4D D702FFD11E4BA238 A79FCC17C4389980 2320E87EBE5AFC25 BE9BDB41AE17BEA3 310EB3F14071485C 013147020E08C23D 61701722E3A8BB54 D567B743BA7360F9 7C0F3B3E44EE23F8 FCA297640DF9EEF8 C24B4145886FFCFE A1856F1559580878 E9E8D88C098E6E27 C30272CD3BEE3398 12BA7AB1493E5175 6B8F06ADB78021F7 061ECD4DA53635C7 E3B112872A3F8DA3 29A10E5C07F6A252 1C2BFD8BB810E0B1 4CFAA40310C25B98 0D0ADAACB1690F02 88622EE65A8A6A66 279839187DAF0E5B A1A99E2E8B60C8D4 1C6C3299B2049E33 CD82F427BB59A9B4 6C939FCD4E5CEB79 D0C39DB7CF882EF8 CAEB23DDD7A06BDE E95008122EA53828 F6F664B72108E877 B548146098B3FB5E C3EF1D2565D48426 D2470C7303F3E492 5F9FE68B1B248C69 F0C5AC816AA37C54 C9BF107D23EA72BF 1D5C5675D9FAA322 534BB200AC3050B1 0D98CF4F21235CEB 722D6C12279D9DFC D6C3E9ABE4349A04 ADD01709EC98A589 695A28714AB73A5E 3F7DBABEB81DAE4E FBA233AAF1A00113 AAEA5D5626757E9F B0EC93CCE6B11464 5FA0746540D1FFE0 EF707AF1B0667446 55EB8F3C1564EE53 BD02EC648248CF21 6EAF7EA76450C40F 94ED2073B1F6B7C8 1D60A455F246C3E5 B16FA0BA4BD1E3CB 82226F383EE811E9 E876FCA1AD211456 DE873F74145ACCC8 D9EC8C54A4769A77 22B5C6A9157D1536 94BE921F91ECF0BC D5DA17CE58E704AF AE4BD18477438602 1E32B91A060C55EC C2B62430AE570F20 430E1C7B961CB9D3 4D4CE3E784908795 5FCEED5AC38685EA F3233F54B536CB4F D12023F41001086E 0A59AE1BBF76450C 6CDAFECC0379043F DF04EC5F008C8AD2 2D3A3C9FC1B909C1 EEC83F251993B254 602B3E4A8677A77C 7ADAA69766B33D64 3F54FA687376D60F 0616D58667C3AED1 AFFDCF1ACA52B945 739FAF8EAAFC4378 1351CF09FF25D6F8 8B7F0E4E60C32589 1B3B56C6698E4CDD 7CDFE6BF6E947C32 CF7990806D6F8742 42D2D22B83A83225 04CBC8D38AD3D684 D79550259F2E9033 40ED8C7B5E2289FC 8E2AE09A2D968530 046D2907B17536EB 80D555B1DB4C7688 131AFE4D7529B033 B66A61ABCBB01C29 ECB0EAE108F91FDD 570F7A69FC11FD82 70CF22D817863058 1379E14078B29988 5B65F32B6D74F7D1 3F5D9ED002F3966F 3767D85E7DDB7010 8D0BE0D764AFFC8A 65F7B12591C9764B 183C28ED3B7090C5 8D0B920FB67D6329 7E925815E911589A DB46CAD8A4A58791 CE4DE72AE0C163A9 C87A6A3F647E447B 119F4E5119D7294D 8F44DBBF7180D5D2 E58193F0C9E2EB90 C0C68EAE33379D95 6D1B0F4DEFB111D2 B1487396D0A4F871 D02D604DA0D61B70

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201307210929 (name+title). Key = MD5(password) = d3f4e0e98ac13845ab11ee01eb221f1c, 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 a82c10d2-0236-7bda-a6bc-4ff332d3f990
  2 539b4c33-cfe0-5a59-9ef0-84308d2450eb
  3 cffcb061-d87b-2e52-8fe4-dcf4136eaf18
  4 d8a20cfd-0122-2371-97c6-b6b04e7e4f55
  5 869a603c-eb0a-70d7-8299-a62312b50033
  6 6d5798e8-1f9c-3ef2-8eba-558eab2b91bb
  7 e48ae3c7-efbf-0a02-a615-524cf211f90e
  8 371c2843-9c51-193d-b9e1-d1293d7147bc
  9 f8212f01-9b21-3f74-b965-662abe3ba816
 10 e7ade39d-d2af-759f-9677-f738b4d8eab1
 11 69a1d8ae-c654-6eab-bd48-f75b45b0d51f
 12 f8a5f2fe-e44b-389c-838b-eb2dddc1d9bf
 13 d266aba1-30d7-5fd7-abd6-527a4452e92f
 14 d4a396ca-cdc0-8e40-be60-b1336eb9b68f
 15 60b243cb-035b-25da-a757-8838e3e7d417
 16 2786aca5-c256-4718-be5e-d13edbc4ce5f
 17 401c802f-2593-4e81-8279-e3fa124c87bd
 18 0f9a34b4-4cdf-1dc2-a367-16b144220646
 19 d769297e-a77d-64b6-8bbe-e6b7f3234db4
 20 8f6b959d-3cf0-452a-a2eb-c3956d04b444
 21 84974c35-ac71-02f9-ba19-b34558fab115
 22 513be047-f512-12c4-a387-a1af9de452d7
 23 24cc7e01-0d8f-78a3-874f-3ca94db346a3
 24 88a92cd2-29ed-19db-b522-90a914a15fa2
 25 f6298de1-5d4e-1e03-b24e-a37507f39b53
 26 06f8beb9-b32f-716a-8cf6-b122a9ac23ab
 27 94437e73-4fc1-20de-b897-3c9e5f2d8de4
 28 4bfb9ac9-779e-5a8d-8854-5bcc0525c0da
 29 b7b5ff57-1887-6790-af0f-afa0177af47c
 30 7301c07f-bc91-23e8-bde7-115701a06770
 31 581e02f4-567d-0ffc-a80f-59a31e7616b4
 32 b906f8e8-9484-0309-b114-e52c7df1adbe
 33 9891db60-f06e-4f53-939e-877e90b05758
 34 b516a159-ce78-4fa5-bf85-9eea44bd1585
 35 77791bef-4a36-61d4-872d-edde648db9fb
 36 0d03e3a4-d8b2-75f6-9e59-bbb241b6edf5
 37 ff482244-04af-126f-bf49-431014e3e464
 38 3a3f476c-57db-0d85-a6f0-8ffa804a38ac
 39 df70358a-1225-8a36-bc3d-28fba932b1d2
 40 51bf6b3b-a220-57e0-8c49-72a295c79495
 41 4476ae67-7d0a-77b2-8732-5c1eeea16661
 42 ed792d9e-b04e-0a34-b5b0-0409f9b71ec9
 43 6f7e0c75-3001-8a32-9b67-c74e41de613f
 44 7434336b-4558-8792-a1f5-d072243964fe

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 75227301376358244164017117256200446710857088. Exactly this sequence comes out of new Random(739).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 45 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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