201208170659 ycd2e

explained decrypted filler

3DES(name+title) ECB, 57 GUIDs, seed 401

Metadata

Post ID: ycd2e
Title: 201208170659 → 2012-08-17 06:59 on A858's clock
Posted (UTC): 2012-08-16 21:59:02
Timezone: UTC+9 · title 06:59 against posted 21:59 UTC
Author: [deleted]
Account: A858DE45F56D9BC9 main account
Subreddit: r/A858DE45F56D9BC9 the main subreddit
Category: F3 filler: 3DES(name/title) → GUID list, seed known
Size: 3,664 hex characters · 1,832 bytes
Cipher: 3DES-EDE2 (two-key Triple DES), ECB, PKCS7
Key: MD5(A858DE45F56D9BC9201208170659) = 9e972d535d937e50be3d2e0aac040ba0 (name+title)
New here: Missing from the community archive; decrypted here for the first time. (new results)
GUIDs: 57
Filler GUID seed: new Random(401).Next(9) ✓ verified
Run: Run 24 (seed 39,416,093) (seed)
Draw: 81 · predicted N = 57 ✓
Machine boot: 2012-08-15 10:18–10:21 (seed = uptime at app start)
Sources: arctic-shift · body from arctic-shift
Links: Reddit · Arctic Shift · JSON
Score · comments: 0 · 0
Tags: automated (decryptable)2012Encrypted masked GUID listarctic-onlykey: name+titlerun: seed

From the post to its content

As posted (encrypted)

FB8EF8D42F6650C3 465094446CB7BD3D E2E302364F5D60D0 35981ADC2AA69FA3 8E86B335D8147A0E CC9E9DDE030CFE3B A118600EEBC3B3B9 19A63CCA1DD36031 B7138ED174768E7C 8638CBBB38C2EE51 C900BA80D5A541AF DF9E933BBCAF1951 CBE2772DA8AE8C6D 91D06B5FC2F4798C D31007BF3771EFC0 025D760A9AD3C469 CFE1DDBD35F6383F 117701ACD23E2CB6 8B63B1C470D04F52 121043A42947ABAB 36CE610FC1EEC827 824F51407AF3EB72 5117F7214A1C83F6 D5D2DB3255B61211 F0D518C14F76BFF0 AA4F3DE09A6C28BF 6A40CA440769F59E 8F4B2EECAE9895B8 DEC1D7DA35B46108 EB5B3DCAE7030814 A6D5B53B4E580F83 5E613A5937FA7F8E 126F0EF5536BE6F0 915C719B026BA625 3061334F6AD8DF74 712850EC46F4F00D 374CF415C9A39EB4 1D7CBEFC5DFD3F12 88C47DDB7186ACF6 C81BA8AB81000095 5D06CBFA76439207 D85C6B7EDF02BE7F 142AFA67B052B9A6 35D07C0A3BC81859 4FF79B7A79CCAE30 BE3B603481EB9ECA A8764C801D3A0033 5ECBAC1962FA2758 4FF18B0BE695601F 20AD63FCD5E72B1D A6F234DAF9C92DD7 41C6B9ACEBBEF0BD 1711160BE2EBF850 009E53EFEBB22591 F1468C82903F845B 08ACB79AAA06140A A6BCAA991B454CC6 58FF1C9729375025 0CA942C5FD9489A4 5E9AAC2756F01068 3FCCE3260BCF1361 AFA781C72809C6C2 790D398ED4074638 A20F6D89DF5AED58 B64AAFE1102A9774 999BB50CD35AFECE 24723A7245F75E48 7B2D6439749A33C0 7FCDD6517376D224 3FC463D7442FD49E B8B8B450F1B20266 B1392EFE054BCCD7 06A38F01EED04E86 4E41B24B4617B1FA 85D6B9263A090701 08AD459C77F854F9 19867950EA5BDE1A EE28E68D05DE1B8A 65846E56EC15A19C 31043D4316F2160F 488564C02F24B838 D7AF17EA1C22449A 05F6AC4541E878FD 3C51A54822C99F78 8A578C14C4AB1298 BBFF5B66F4DC1D3E B2C57F2E8806BCC0 ECCB2F96C935FB5E 6D965C5E5F7B79BC 0FFA9BAB03AD0C2C 7E328E6F4CA778DA 5F6080696A39D080 6BA3880FCBA4C88B A6B9848D5E0359F2 D6F678B553D451F1 4BAC73F1D042E092 D9E15F61248BDF63 6E13DB1FA6CEC850 0AA087B2ED894FC8 AAFF901CB0C2E1D8 306D6E42A3266260 211C5C03DF20E121 5477CF0F6C59316F 0CA785BA3E5793D5 AF6213523B688DB0 C869022F42060792 A06349594ADDCBBB 1E606A0006D869B9 AE84BB02686663EB 2F0502BE0D7DBD38 776D8BC73BC22953 3C5209848622107E 753F3EC46452081B F3AB8E7EA1FBFB8F 1DBF7537F8BB4D60 296C1382790A9A60 10CC34597FA013E5 CFFD638DEAC35D31 46BCDC9A2CA1C92D 4D081C54D6A1767E 9BBFB1FDCE9BC84F BC82BAEAE9123614 EEC317C121F72F23 19247A9258282D2C B082D00C577AE391 EC813FE2064BE62C 5FFB8BBDF88CB6CE CC145C85D27B015D 7165C00A3B2B6338 B2EBC84B3F79F914 167370B84FA46E99 57E0096ED109C692 7B988062D3B36184 6717D7BDA5760756 D45E93A565F68B5D 75E274F7EFE0D573 4E5112ED0C7792FD 78F471F8676D277E 7FE5B646E915D843 10248B7757DB3BFF 0B29F8CBB6557A28 E61680776B58CC91 06D9FACE9D37C6B7 F6F085681BDCAB7B D3F73C710B5B560C CBE1D94CD838D009 FF75C8F43F975627 86DFE05AC09F3E59 58C1995BE78E1F65 1794FE021B049C5B 0387FAE85C19E539 4F1F1A33CC387358 E9B03634F1DAF116 EF8102C3275A7B95 12B259BBC815DA09 28ADF25F3BE8ED76 197CF305973DD307 CC531EC9DED8A9B9 7350A8DE08BD8FFC 453FE360278F7409 E172014B182EE1AC 17ABF3B20D348478 DDAD845781DA850E 5D96FF577F53D3A9 55DB8F4157D2F75F 8AE1EA427107771C F4F0A4C47EB4307B 2E0FD1FD6DC56155 27E198BCC9203A58 84ABBB507D168829 E308A3A2712A0EB1 990DBBE586FFAA8C 632108877002BC00 E085EA60FB96512E 99FEBA3759AD3C23 4BB35B3567DBCCA3 9DE392701439F334 BAFB4D3847F60346 7B0ADE18E2A0A9A9 1EFCAE77F820E237 7FABF1671B48F08B DD7B55E4D4C46F47 D72A6B227C33A480 C83F32DDADDF366A 8D8FD478FDEFE6CE 2FEEB278E87B2E84 E34FFE98E13D3E23 C4D721109F764DD9 E990026EAA1F7D62 F0AFC52C4FBF0321 ABC7E34E9A5347AF 5FDB6143D342B6A3 0E66FBF4103A551F BCC6D1CC4ACD6254 CDD4D4F07D8FC1ED 3D36E5CA09CEA2E4 51D96CF03896572C 642371772DB10FC5 C4F7AA94652131C2 54086D8A3600956D A6F133484D4BBCE6 B5AAD20241B60E3B B1B7CA659EE12B61 65814D72840519D1 683ACB16145C8B84 7FECD4836A0B4F6B C18791B93ED85469 902DEA7827126197 3A62B18806B6D70A 6548FDCCF45E8EE6 D9867B64B482F7B0 76ECDE81D59B1157 02AB33C26AB3B72D 0D834F9951802E89 6884C36810C9D802 1512F3DD260F769C 87B5945B7AD2AFB8 83A97A215FA94C41 0DD9CE410E8B4014 343828ED2D65EA2A A07E1DB9102B9A82 7AB9043E36BB8C4C 26A7EF0BA9D67EC6 B43E08CBF02241D7 4013340BC063A2BA DBC48E2F47984122 81B05DE6AC7E5CF8 D1ECE0A8162D5F38 173859B0BEFE3119

Read the ciphertext. Strip whitespace: 3,664 hex characters = 1,832 bytes = 229 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201208170659 (name+title). Key = MD5(password) = 9e972d535d937e50be3d2e0aac040ba0, used as a two-key 3DES key.
Decrypt. 3DES-EDE2 in ECB mode, then strip the PKCS7 padding. The plaintext is 57 GUIDs as hex (shown below).

Decrypted: GUID list

  1 53316eef-7837-1480-bfef-26b792809930
  2 86085e41-c6c4-4383-9a09-3f8321a3197d
  3 450c0f1d-a990-03a2-86d1-406e1adceef9
  4 6b445dbc-d6cc-17a3-b8b8-8640d4b9889b
  5 de59e365-0b59-2a1f-871c-72df305baf69
  6 1e15b9b6-f277-82b0-80a3-6213d2c790d8
  7 446b9d58-73bc-5695-b380-6d9d2888a3af
  8 a8a66ef7-022d-513c-bb24-94e1f1fb53eb
  9 2b7212e4-a97b-5c75-9210-ef115bcbab90
 10 0c62f24a-5a27-1187-a2e6-cb02762bc410
 11 08486823-9d7c-6aa2-aa62-f2f56e440c17
 12 205a4ae7-a95d-4552-b56c-c49323aeb11f
 13 e2aed28b-c3b9-23d6-a313-30d1ef45661e
 14 73e12f98-1702-0866-87c0-8ca8fec603f5
 15 24ba0fdb-beb3-6882-ae98-fa2e9a3dcd4c
 16 01e0df51-2014-4429-b3a1-2a604aba572d
 17 2f603600-6a41-33d7-ae9a-7f85ebcbcf9f
 18 f1290173-3fc0-5887-a09f-3d5a8ea56c51
 19 facd9974-671e-473d-9635-957d88371c7f
 20 4158890b-7c16-585d-8fcd-ba81807487c2
 21 c2790e4e-2dc9-0a88-8082-6e95b11b2929
 22 7d2e1466-fda0-250a-96b5-8e6e6fdbb8dc
 23 aa76628f-9d8b-63ed-acff-8082b63069a9
 24 67c9f96f-350b-1f9c-8b18-a820a9b5ca06
 25 df7b4e76-fee5-05c5-a449-d1438cf69786
 26 753437b6-82d2-3746-94d9-df72f1a86a71
 27 6a1eaeb4-521e-6c80-9400-47b1915f69f1
 28 bfb55f4c-3b19-1d32-87e1-0e4b111e4d12
 29 429a3e76-4130-248e-8714-06faf1d99377
 30 8fabf90c-ee33-08b3-bcee-d5c6e4cef3ea
 31 bb8345ee-8c91-2e03-b301-d4ed9bb4a921
 32 5aea19d8-9636-0529-b00e-81c0b4948d90
 33 7d67e60b-b269-4be2-81f9-446ff5cdc156
 34 7e92a98e-7bcc-06f9-93dc-6f0d34e6a46e
 35 ed440f37-745f-5f9c-abe4-31f95d9b225a
 36 da04fc01-e88b-1f12-bc3b-077ae65835ea
 37 14e4a35a-f99a-1062-b138-94051baf40a0
 38 9332fd94-5731-5cae-850a-ce101b17d03c
 39 f91b3e8e-eda2-0d25-8b53-cf242bebe9bd
 40 037bd253-9780-5143-a3ca-a26a92f49bbb
 41 fcbe4957-608d-3ee9-b417-083127a7c29c
 42 ad3760be-1841-1e87-b215-8c9797caba31
 43 e1af2f56-d7bd-4fc0-ab7c-19a12614738f
 44 c4e13fdf-9467-5f59-9997-c4343a0d46ae
 45 daec12c1-a69c-2ce1-ac95-aeb9a2a8bca1
 46 a478e6f3-b7bb-8a64-b336-1264ae3258f4
 47 7267b258-71a6-67e3-8701-c5ee26565bfe
 48 6c8c5114-7eb0-63ea-b37e-6f0dd1af8266
 49 f61fe926-9bbe-2d8d-94d7-ee9bf4a5075f
 50 521037d8-f759-142b-b384-a22ba974fc2e
 51 f78528b8-33ba-892a-885e-1e3add6d8b12
 52 d62ba1f4-635f-4678-8d1a-f82fea800838
 53 f5a2d597-0fe8-0d7f-a054-90f1c79e90f4
 54 ba626068-67d3-13be-bd72-9b60cd45a6f8
 55 45b04b19-03e3-4bee-8cd5-1aaac9d2f517
 56 0fdb6bf9-c181-8e72-bd5a-9cd400b20029
 57 88a3e9e5-f5d8-6f30-b3ad-ad11bcf4dc88

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 140128555164206435450261036120204051150531452866218401486. Exactly this sequence comes out of new Random(401).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 81 of Run 24 (seed 39,416,093): new Random(39416093), Next(8,64) per post. The RNG predicts N = 57; the post has N = 57 ✓. The seed is the machine's uptime in ms when the app started (boot 2012-08-15 10:18–10:21).
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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