201302260302 198zk7

explained decrypted filler

seed 419

Metadata

Post ID: 198zk7
Title: 201302260302 → 2013-02-26 03:02 on A858's clock
Posted (UTC): 2013-02-26 08:02:59
Timezone: UTC−5 · title 03:02 against posted 08:02 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(A858DE45F56D9BC9201302260302) = edcf4506951d95c0db257a081474667d (name+title)
GUIDs: 44
Filler GUID seed: new Random(419).Next(9) ✓ verified
Run: Run 42 (seed 983,934,859) (seed)
Draw: 33 · 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 · 1
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

8B12785EF2A6F703 9530095D297338DA C4A142A2CAE99DCF CD4C03948818D14D 21D66527BAD5BF7F 94FCB6D1E35AAFA1 20876E28F8A8BE4F D17F2B1F01E49C4D ED25FA8A942398ED 930ADD6587250E8A BDA5D68985D37098 D495ACA75F9E435A C2B7B5C6316186F0 CCEDCC006A88ED61 C43EDCB5879CD155 0E45425EA06C4855 E5A028C5F44F2597 CE0533BE1AC9E98F AC3630835EF7A057 7949D7BBC845B955 1934FC8CBBCE7752 98D19445DA77AA7E 617720971F9A25FD 54B8C8DFA21919B2 188685574ED4688C 9F6D6AF84FFAA41A 5A8ADB16415D18CA E803AAB500B41F90 2865B72A8A35F561 06FEB00EB83CACA2 223BE8719AA2E9CA E332FDBA1DF61923 CB01C9A66F07795B BD31DBBA48281D15 8508F6A33B03EA1F 85FDDD30CB87932C 553FA3DE988EFDA5 50F94D5EE75C2D32 1ABEEC71B83691DB AAE9B27703C00087 060ADF40931DEED5 63378E75DCF4044B 1548F3C477F44503 3C1C6D1A21515F5A 37400A78907602A9 904EA8F1D66DE9CA C26A82C4A40212B5 FCF75FB26221EE6A E8E7F269287F939B 58FEC832FBC31529 92D8827F7C765123 D066FDA5BBBEE3E3 C0CE39DF918ECED9 DB28C19CED3701A0 DF9C5B4022C8EFDD 353178CD957215D9 9CC1373250BF5C11 A4AADA1469F249CB A1CE36490F1DF21E 1EF1938871FA446F 94A504D4713B8666 C38E3AE98D09904F A22E5BDC3FCA31AC C8E696126F99C322 A485E53DB3D17C7D 11948FAE6A4E4F66 99312069F8CE3428 DD926344370EC1AE 53D6251C5EC301D7 729B75B900065A63 05A7D382D33E0328 E22CA73DBC9B1927 F4C5AC0DADC40E17 55BA39EA9F4491FF C9E6348F6E3867F4 18CF0C585C3873EF 5C761682B9F5B25C A288F60E3AE8146B B0387385C9FE20CB F18036F54D6377A9 E9C8D0507F4EBF54 4679D0FAB6859700 CFAAE03E9C6706AD 5098774EB2192BA2 8FE1DD4B7972D2CD 224AF8C1FD15C143 3E654BBC4D937289 BBFC68DCC2C829FA 8BD40C5A013376BF 82FC1B658DD14B6B 4C6F30F4D6AEAA39 60DA58F71696D4C4 2738E81EA9034ECB CD15BBE7A063B96A 09DC672F9F144C17 B88BF5CD2C9E3E5D FC3CDBDC829D52D7 29B8694269723B32 DDFA08E59E167E2A CD87117F17BBB44B 8D8586D80D075E2A 77885138FDBA86A5 9F7BB82A62F8442C 3D071518859C5732 4C84DD02AE398C3A CBBB1B042048F5BE 4C7AAEFD5864CE6F A027D5A4325F69AF 932CB1C9D6EA4B86 0B0E0667E3BBB8BD 64D53E766732B8A4 73D8B35FA320FED0 AC2833B0C67EC406 A65E28F517E73E30 AFACD6289FBCF13D 21CEEFC558F25D03 74FF88735517587C 8BD45C6817DA6C15 9713F3C2C9801BD2 8AAB8F5B729EC6C0 F0CAB211F195B2E1 781D37F9697992FC 12EBCDDF536C22EA 788DE37CCED5024D D456FD31B465F907 161EF8F101BEBD88 ADEE64904A577D01 07467C256646A088 BC5627923B4A3CD6 9DC5749133DDBD1C 4E8B9507D25E3560 BFB8B85406321AB6 0C6A768F9777C668 2B41B2DFC211CD1D 955F5E49B4F29726 48FFB138A16F11F2 EBCB734BA47CECBE B4FAE611AFA2E9B6 8B883E71E80CB97A AB2E74899D407CF3 73DEEE0A76A178AC 1155D130DD8697F7 AD6DC19D74018FB7 980EF33D08E71E7A 0E5AE2D1FD6B5EEA CBD0975EF14B8F7C BAAA8243520BAB22 D33FE92251351C2F 892645E5B9BA14E6 B42AE797B7933A0C 98943D61BA5778CF 392A198608A4D672 61C828BA45E7A916 54313B310453FE08 CDE4C97A027E00EA 82E397CA3FB53F80 BE14A520D6763A01 1CFF5632A64CB10C 3D77D4DA6B24C802 30DC75D7A7422586 D0AA2CDE4B41B012 7C591E9472D92332 D54834E5C0399638 BD7E210C710D3A25 7556223AE7B9CDBB 78BEEDB29A54BDE8 5BECAD3AE2F0CFF4 7F0F12BF3E7EDC1E 975B840C7EF2CBFB 1F35AB9B8199DC95 AF685E696709FEBA 44C44172A2A5F091 DBD0867A2C4C8C45 7BCD3CF77E15BD23 A255FE8ED46A8009 2ED5483D2A7D2063 F1B7B9371EA029C4

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201302260302 (name+title). Key = MD5(password) = edcf4506951d95c0db257a081474667d, 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 233d079f-f09d-575b-a459-26850421a6a1
  2 7bb648eb-06ae-65b8-a6e9-2b6efab887f7
  3 a0868a46-ddba-5210-9168-dd5040f6f5a3
  4 10f3679f-643b-8895-81c5-2866a4949334
  5 3646e406-7c66-3df4-87e7-3b07a547beec
  6 db4ace27-1b0c-61e3-bdc7-59d0f4d0bb25
  7 5d41064c-06fa-5b2f-a266-f9fcfbe9b85f
  8 e9443fb5-0312-5467-890e-41640dbed25b
  9 9c75c016-b677-70ad-b52f-e47dad8a2b40
 10 8c4124c6-fcf7-7ed3-af40-cf7536e534e6
 11 7aacdd47-03cd-88fb-b29f-c55c589bae57
 12 8194adb9-42df-5006-ba9c-8e8e198fb5de
 13 d240d0aa-c449-6f5b-a1dc-434b72bcfc3b
 14 3d7e8259-0861-4b65-a3c5-f62993985ee8
 15 4541b89a-755f-20de-909a-9436def82471
 16 5217c4ef-b6e4-6158-b84a-9ca7df46ac2f
 17 ee3a5043-b72b-890b-b08e-64f1128aa00d
 18 9dcdede0-b01c-6004-b7ac-4e4311af5ecc
 19 d04e2256-18b0-0063-a48f-6e03c1910a42
 20 e1e314e0-43a2-43b2-b93f-2f465dfb94c4
 21 fbf63fe7-1096-4edc-ade1-403824e7241c
 22 8497c86e-256c-5672-b38f-a6b7ca40dc8a
 23 57d94c86-aaef-7b43-93ce-58b18ef2c63a
 24 49f300ef-c9e0-3f0d-ac49-dbf668c99ea3
 25 4eebc97d-087f-62cf-833c-674d91f7924b
 26 a328f70f-02f5-0c78-ac49-e6c76bf18777
 27 511a454b-f286-1506-b8d4-0c310c273679
 28 dd3c2904-39bd-2f96-96d7-f43f1057dc9a
 29 d20f0f8d-c64f-2e00-a221-fe881cdaa16d
 30 07310445-860b-4dba-b838-4ad88f7ed649
 31 b1200866-d7a9-70b4-b11f-afc50edbf4be
 32 214f4870-4dd3-79aa-a429-3ae9d9e5dad8
 33 63ad6e4c-5062-7b1c-bd15-41683d18d4a9
 34 8eb07e79-d91b-4f10-8305-cffb3d6bfd31
 35 5726a2b0-4cd3-8ca0-80d0-f2857b57899b
 36 eb742dee-1acf-8b63-8e22-a4e9b5276b72
 37 9882c1d1-48e6-029d-8948-abff43eb0d46
 38 e66204d3-e8c6-82ae-8147-a4b56b3b1c80
 39 c9b760db-3a64-04a5-9a2b-918c01b2d39b
 40 918443dd-6213-7be7-8b72-5369fad7413f
 41 b94010db-1150-109c-8887-3d1d7b67e294
 42 c48d2fe4-6782-195b-add7-b705232f9681
 43 f461dfd3-f27a-7168-ac47-5d281e39d208
 44 823d3d01-74eb-6e46-9d72-b2631f537795

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 56583655778564268604457360122477748808071176. Exactly this sequence comes out of new Random(419).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 33 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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