201303010908 19gnk0

explained decrypted filler

seed 808

Metadata

Post ID: 19gnk0
Title: 201303010908 → 2013-03-01 09:08 on A858's clock
Posted (UTC): 2013-03-01 14:08:55
Timezone: UTC−5 · title 09:08 against posted 14:08 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(A858DE45F56D9BC9201303010908) = 9caf1e90ede71f7bc2454c5701043ff8 (name+title)
GUIDs: 44
Filler GUID seed: new Random(808).Next(9) ✓ verified
Run: Run 42 (seed 983,934,859) (seed)
Draw: 104 · 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)

D3F419AE897465B7 89F4C64E85AF1276 535E7C1FF257711E EFB0915BF76DB742 B36CF5E7F055883C C8629B8484589287 589019BC3A917366 545183A2C044B617 5ABB467336A40780 3EA0B94260A28868 5A25841114152F46 61EB57F1428BF073 B6D190EA95DC7D6B 030C69CD78FBC207 CA7FAD88610B8F71 1AE2B4EF495327EE E048B9B77D183214 3C5DE81C4253EAB4 5892C593B03833C1 2D4D0134818C3BCB 80645D57424E5C06 8CB991E8826B57BB 41944964850C7401 D9C8B6D25DE502C3 4E7D353E68F752ED 4BF10A28B5E22B17 EE44D7C18D95BB85 F37F2FF38BA1353A 9E3541F3D9926512 372AEE2273F9B768 F3A4DDFFD925C858 E198FDC8E973EF34 01B45D58AF9EEC1C 05F91ECB98C2B43A EFB0863E528252FB 3D417D8EA89587E1 C7962B61B725F648 2EEFAEF469CE5BEE A264E29823CE3BCF 9D860063EBFD0ED5 DC7E2EA0F43E2873 3CD73472A25A3FD1 5098CAA6F8C0807D 9CE10DFAD1993093 D7B6DD9895EFDB27 5DDC2D8D38242872 50EE92F8B6DEA52C D6986F09F47B83AF A7511C57A9099E21 5CB1D7D18638693C 8706383FD00314CF 7DA658F188268598 CC3693FB7E4CCEF1 E6A72CF86235DB01 71F38E525B73E528 F2226F556E3CAAE8 9377DFE2F005F8C8 74E57586F36CD31A 85DEB3A35C8B1966 7E1BE11F05D01B01 0134DA14E390D476 3BEB29BBB5BDC2F1 82CE810B01713A54 F4455A0A5CF691A3 4A478324C427104E F778B22FDBFB4022 74B3474A43B716A7 80F0B781A3622C04 BA55DEC721F2A321 A76F037E81414CFD 0B27982F947B64A0 42EE6B5485727467 D5105BD7A89D8369 8D0A8C2FB6C2A951 B692672A586CB175 7DEB9A4DF4AB926D E71219BEC87091E4 CDC929DF96A75403 ED6C6632B3462B6E 5CDC2384E69E60EE 0BEB7DE61458F935 C73BA66914C591AA A923FDCCE0F0FA8B 58B3E161149BE736 87BB2881881CF8C6 F2176573D40480FD BAA81AFE68EEAED1 CA8E0C127C109CBC EE926B84D7154487 0256B3784CE112FD 6A50C9A131FB34E0 30BFEC35B64734C9 76D1AF6051180EEB EF92E32365E9952B B0698B6ECE99CB2D 2392A9350724C706 269DC3F3773CBADC FB133036DB02A289 1A4DF8C886C49D42 607B2DD95130186E 99AB7800AD990473 A00859E56BA2391C CD328977640A8F34 9CE38D5EE9594194 0685DCF829EBF633 6793E326960EC52D 6157C4C286F26DD3 54AD1FD8EE95C209 77F3B5DA2DC5C4A1 7526427C58E2CB7B 5E1F3799BB631193 5FC25B7C0B985C12 899B8EABBAE3DA0B 5A6695B48ACAEE9E 428F8A39CB1B41B8 A2DC20722720495C D112E914574C5D91 4CFD5EF4A8DFA52E 269C1BB7F5215711 A0B4BE81D629C8D7 E12D887999979CF2 BAB060996B2C3785 9F3A136E6AAF797F D46966B480A5AB2E 3EEA78238CB0395A 73E70277C9FC39D0 28695BF1527C58B2 A4A93254F2E73E57 5DD9F1101678917F 4EF55D1EA7D9B61E 8B097662F3CB7A71 640E3203A0981007 4A673C0CCC6CF5CB E0C2CA75119FD9B9 C84767B8A3A88969 40D742F935430184 B623735B37CC2E1D 1373A897EDAD1DF5 CC8BE65040CDE5DA 37774B9ECEF809B5 636D60076DAF582C 9B582A18EF24CB67 2880582A690DA4F1 880384ED3503E0C5 8EFB6D1E0197EBC8 0561BBF08DB3E217 5B8BA9EC9EB5BE60 823B46ACA609A24E 67CDE37B29083910 19DF6DAD411B3879 1EE983AFDC1AFCF0 C8644DD4A6F4B7D8 8A5AD48F606CB98F 4E2E306D3A6AF7D5 F2E6A343874EB47D 974994DB7B30A254 B4DE3B838888D535 343D3A136BD2A7D8 E1E9252757A035C1 98175C646E45C5EC F768B0DBD5D3A9DF F40E37EBD066BCA1 8B7422F715BB9552 5C7C666095FFCF66 F0AF6C50FB568B91 CEC6C1B5584DBF32 3344478E880C0D40 E52A4FEAB7C40D92 C091130B81896FC6 6741EBB9B77881B9 780F9A8E5D0BEB10 012C53EF458A9FCC 6F0CAFDCBA092753 2A73CA0FF754285E 67CFB550ADE8D1EC BEE796A49CD464AB CC68E2A3DD76EF83

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201303010908 (name+title). Key = MD5(password) = 9caf1e90ede71f7bc2454c5701043ff8, 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 64ef7af3-c714-76b6-8a84-7d372ff9928a
  2 ce186fa7-c2ec-8fb9-9ed7-a7fe1d83796b
  3 a8c88c78-9c30-44c0-a9d2-80b8252fb83c
  4 cb0e247e-4761-033c-a415-e63e027a1a48
  5 d8018bf1-cf4c-007d-8149-860192c42751
  6 6db3804d-3cc5-6e46-bcb7-431f260f58de
  7 88f2df9b-3d3c-8acc-80df-eb2afe136971
  8 0fd2d0e0-7d7c-7684-ae10-e2e126097d1a
  9 b12567cb-0d48-8467-a932-f63b92779fd1
 10 0ea89ab6-329b-205a-b3e8-ea9e50955b28
 11 6ab269f9-fbb5-5b8f-8543-acb685740ccf
 12 7f8ade12-1838-2917-affb-adb6837f3197
 13 bfc60a7c-2ec2-0bdf-88ec-5d14be44a975
 14 ebfa842c-79ca-7a93-9ca6-396a59c4a784
 15 715af270-4b46-53b2-8e83-500542819264
 16 2d564f0a-63a9-5896-bc3b-a4dda25fc184
 17 6624f2f1-bd5a-45d5-a152-1868de62fd14
 18 3402abb6-1eed-88ef-a594-7192779d1656
 19 dbe26803-dd5e-486a-9178-11c546bf7f87
 20 122eca9d-0c55-118a-84ee-d0bd64b72ef7
 21 dc8295c0-ce56-1aa6-85af-556c8a6a2c01
 22 154577b6-7972-05c0-82e9-15ffd8b879b6
 23 c64c9ece-cfc8-422c-8f71-02d22906febd
 24 00706258-e45d-2a46-b1a0-b4fbf4d83af9
 25 1341bf29-c6c3-7332-b43b-61b411323220
 26 44ad5ed6-e763-1b8f-b5ae-b1aa4045bd7f
 27 88df0749-c38b-585c-8951-fd91adb1c35d
 28 caa817dd-9864-2de3-9eb0-3db3c2e7b5cd
 29 d2610180-b671-63c6-bf91-1e5486e83675
 30 2ce16c34-27fc-7973-a8af-b7a69b6461ec
 31 fe93843c-1247-4f48-835e-890ab552896b
 32 944b188b-101a-24c0-b66f-5a24d5df7886
 33 99b9fbc1-6999-1d11-bae4-de07879c4356
 34 db54fb68-dd2e-23a2-8ca0-e98fe466d551
 35 cbfdfac0-1254-721f-81f6-73bcbcad2df4
 36 a5a506a2-6674-7fc5-b424-586a66b6749e
 37 135a4fe6-bf0f-3fa4-badd-cab42b68f416
 38 7b2fea9a-4d06-06bd-812b-87678f3ac1a5
 39 ca2a3063-77a1-608c-a2ae-c743afd9d8d3
 40 2476e726-2138-6d59-9d16-fcad5308260e
 41 91ac9582-91af-71f4-b138-7ec81d921eb7
 42 c0f5b401-1a74-15d6-93b5-bb9d49086762
 43 b15c80a6-4c5c-381f-8660-ce092b491bee
 44 1c7acc45-50a8-62b6-a969-a91f0ea57ff6

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 78400687825207554841104271526742127730667136. Exactly this sequence comes out of new Random(808).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 104 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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