201302242120 19612s

explained decrypted filler

seed 679

Metadata

Post ID: 19612s
Title: 201302242120 → 2013-02-24 21:20 on A858's clock
Posted (UTC): 2013-02-25 02:21:00
Timezone: UTC−5 · title 21:20 against posted 02:21 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(A858DE45F56D9BC9201302242120) = a55594f9349b8904a9dceef25fbd961e (name+title)
GUIDs: 44
Filler GUID seed: new Random(679).Next(9) ✓ verified
Run: Run 42 (seed 983,934,859) (seed)
Draw: 6 · 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: 3 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

8901F116A4BEB2CD 73DCBB8ACB7A8764 051D900300B877C2 F257E94DDB958677 C47996A6A16039BF 155DD2BA2E67903A 3825CFF1751AA75B B3590C965C892090 196E787B619FDE74 20C66881A72C8A10 B4C009FB9F535436 A00650CE079AAA95 DA61EC9554ED7E9C DEFDC4F2EE393A06 4003EDD986DF01E2 27C3E429C8547931 7C853C3AF33CD803 17336992D2884778 5718A3F4DD81CEAE 4E5333A6748FBBA9 EE055A0228CDBAAA F7A4B7A47509184A 0348014E133E1F4F 44B7D35DDA3B111A 279C75929E8F879A 2D0ECE27DDACF020 B0A6100327988178 69CF9ED9E8F74A6B 6127FDA6028E9BB3 BE4A4B62398EB085 AE44B0FF2D21157B 3A095984B0535866 E0BF8EDD9AE083F5 131A53AE8EDD6F4F 6130861A0F0A99D7 29417DC59DBF6389 0219B0858E89177F 0DF155BA5265D817 6F40B5F403A4F3DA 804B7D2AF5F74175 269A5725A5774F80 CFA2D2F0753AB6BC 90B73AA46655FACC 8F0DC595F498D427 9D55432DD8727F3E 809B18636E9F977A 1FDF51788CB8EA13 5619ED2AFEBB2B08 5B536826A77CC0E1 F3B6731E08289592 24551C6C04D6097A 5D53E18C74BB3187 FA601749AA2DFB08 7759326A613A5B85 E932CA1FE8AE1259 CE95423C028BF75A 2E39427C01AC8A1E 1C0BD00A91C7F550 6BDF67CF48CB7A84 765A0C05E8394ACC 9C1EEC567E3F404F 217898F0CF8F0324 168290D12F4AAC3C AAEB7DBDA8FDBE1F CC9868C06EEEFE10 AF3C5E572FF21CAC 161764A8658151A7 0E17872130EA04AB 0032C146E4F80351 573DB650641A7F3E 57479C84CC63AAC1 FC3A610FCF027DAC CD7C81F46D4041F5 ED57A7DE0E587511 2AFECFC0360D52BF 7250B8121C6CAF0E E6053D3FB097698E F4DBF6BA909D33EB A6AA3BC12C9AFE19 5DC49FC23D80A97F 82628712608B7ACF 4CC55E036622CE39 79CB6A7AFCB8D5AE 7D3301D6863B1538 8F4BAEC793FBA5B0 89E581814107F6BE 91C7A01069E77AF0 142C5178F659D5DA 2F5970B65F4A7DF7 BD0D7B38E61F3756 128420C800DA62F5 933455EC3FD002B4 118619287E20301C A2E719B2264D4979 39AC290BC7B2453E DEC06957AFA0C6C8 B01207325FA03507 035D675B18C48A7A 080FB381E77DC5CA EDDA4C58892E8115 0BE41227D5D64A5D 0E8909A220E36A52 D44EEB65CC93F29B E8D548A430648CCF 0D6A99D1C6914AE7 9B01B288665A89B9 5DB84A5830CF9F82 38FA5C0CB3F2D531 6BC87312428C7E92 467E84E612488192 56A23F5A63F7843B 2C5B341AE326390B 9BFD1C33541CE858 C2AFD21B9E08D4D2 76D16CC0A0AF5DE9 D025A09A9F908597 B26C192DBD28F397 803D1B4D710ACF8A 510D1DB10ED0A39A 52FAEDE3F6681E7D 040D17983DEBF82C C70511C55064B793 81A61F0085BCB983 2853349861381E9C A587D66AA6827AA4 0C87516050E2E879 F28851D42988CFE3 4DD5A0E0A0231F1B A736AF4BB2A200DE 744CD9B19A77EE0A CD515CDA5D24BB6E 1E6E2FB066E48B0B C33485A4A2A801BB B025D687EB7A31CE 6677FAD57FC86EF3 2EB8D384A3C64ABD 34DC6ABD0C9A0EA2 654AF763E075BD2B ECABE65134281AF5 0FDDAD7C03DFD0E8 FC4010F34F1E2CEA F424DAF403727F8D 88E4CF3A87608AFC 960AD0022F3AE6F4 12BF6F361C2FB176 9628EFACB69A6EE2 3F5131D0CB138284 7056746041AF00FD 3E512D6462863DD0 4975120D7A8D7D3E 3D8B2156E48A8A49 E342F956F40389D0 77DC73781CB120B5 17377482FCB2F1BB 91BB1538D32EA0AE 2A5691D5FF6D2BF3 B17E6F9F75408923 FAF0FC336362CC94 E41484A3DD13212E 3EEB880F713144CD 96C1F5AB4DCAB51F D0E1B5B6916A55E2 0EE4C2FA360A500A C77F1BD338DA462D B6F2D94B2E7CA841 6D63225C162F57EC C1AFC91CAAD13A25 D3C1694A7D4A0EFE 74C14D362B6E8D4B 96275B02D3D55DDF C2ABCE491352B63A 1A74BEFCA477C154 3F1FDDE89702D3BC 0382C8F9B07A9D29 A627D5D4EDAE8E38 BAFBFBA6355F92A3 161FF667A34B8285

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201302242120 (name+title). Key = MD5(password) = a55594f9349b8904a9dceef25fbd961e, 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 79770617-a3ea-4571-a10d-c85faa1c6b09
  2 bb040934-c97e-090e-a540-f33f9582d1b1
  3 8efe00e4-484c-3b17-85ab-4880bcee173f
  4 2dfd4dba-ab4c-4bce-80c9-c8d3d9a1e1da
  5 09406e56-842e-6e5c-8838-86e5eb341a33
  6 7f6a97fd-965e-82db-9c21-e89622190a62
  7 c0dfc002-100e-10b3-9905-379e22aa25cf
  8 c5ee072a-140e-01b1-a5cd-ce36d9280904
  9 a94c9fe5-173a-8bf5-beb1-06414d167d6e
 10 d692a74d-2127-5258-a429-4eb5d28ca91e
 11 8faccde5-9eba-4510-a14e-9ad81f64137f
 12 3c050148-8d29-53f8-92c9-55d97cff6957
 13 1109d864-b295-38b6-9f70-0a3a1f76a2c7
 14 bd4c3351-0378-6627-900e-a45f69e6e968
 15 1cf80a32-f8fe-2a50-bb4f-488e191e4845
 16 45f41186-f9fe-0730-982e-91b209506d08
 17 e4eb6aea-d7eb-2ff0-a2a2-8666013cf91b
 18 17e1e07d-25f1-893b-9333-7340b815c25a
 19 3a1c67f0-72ea-09a7-962e-d2b1d9f3ffe1
 20 9e13b329-eb30-29ad-ad7f-2ebba445542b
 21 c14824d9-faec-08ad-87ac-de53b3e2a5f5
 22 01808db5-35a6-3750-bc6f-caafcab57ab8
 23 67795af2-d0e2-6f10-863e-19ed31b8a260
 24 4076a728-505b-25f2-8582-ce000fc3d1c4
 25 d54c3842-8980-2738-9da4-c1de8f5c75b8
 26 dbb47b25-80d3-23e4-9fcd-1a7cd3cc8aef
 27 086ee30a-54e0-610f-875b-507bb5800525
 28 e9bc529b-f147-34f1-9b9a-927f2a04ab0d
 29 be5dce82-e04f-0583-b9a1-d64d6e780b63
 30 97cda6ff-d5cc-8108-8872-272d10f5d041
 31 4697ae0c-5a9c-776d-a8ae-80f166aaa25d
 32 e5af3b9b-6bb0-2b20-9b08-7cee72176a45
 33 3486baa6-e133-3977-8a00-5ee3e77872e4
 34 b017c3f1-c537-0707-8579-ef96fb8734e6
 35 0e51b55f-756b-65b6-b7f9-4b10a3be1e07
 36 be1c3870-eeca-1899-8eb8-dc14464ab420
 37 6f060b00-c7b6-4655-b48f-c5d376e2c426
 38 60f6f1cd-88e9-18e9-8e23-21ac4c6a2226
 39 efaf427c-f9ad-5028-9a92-97fcc26d8c19
 40 6679262d-cc50-49f9-9bf1-2d4b9dea38ea
 41 32e14931-1aca-6c40-977a-217d27f381fa
 42 6fcb2df4-d334-3210-8177-3d0a2aaaba45
 43 847b5001-ffcd-5178-b853-395d07aedbef
 44 dd243b26-b97a-1de2-8f4f-fb3be88f97ae

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 40346810854536202802036222630872306141546351. Exactly this sequence comes out of new Random(679).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 6 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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