201303302334 1bauhw

explained decrypted filler

seed 618

Metadata

Post ID: 1bauhw
Title: 201303302334 → 2013-03-30 23:34 on A858's clock
Posted (UTC): 2013-03-30 13:34:58
Timezone: UTC+10 · title 23:34 against posted 13:34 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(A858DE45F56D9BC9201303302334) = f483b655dbe0de7f9237eeae7af71ac2 (name+title)
GUIDs: 44
Filler GUID seed: new Random(618).Next(9) ✓ verified
Run: Run 43 (seed 120,022,078) (seed)
Draw: 93 · predicted N = 44 ✓
Machine boot: 2013-03-21 09:44–10:39 (seed = uptime at app start)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 7 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

767039D3B17ABD30 E5F96EDE96872713 76A91D4DE55C1701 A4CB0DFC0F77B750 2545D4D28D6D52CC E3E5A3AB26F4AF96 7AF8BDD9A65B24F5 35C8154578BC999D E10370BF4E52AD48 E31C65A4C0F97F4C F82B954941A2536D B67968AD3ACA914E EBC5E9D267CB6ECE A3CCE6D02C63A43D 9C7F16FC23CE8BDA AB4819286790215E 9D3D4E584D10BA13 D1D0C4BF47537BB7 6EA2694C11A0490F ADD0DF897C2C5623 2494CC81BF2AC895 86A3CA309CF6388F A33CC8EE958A1268 97EB5A359107F97C 04DAC36AEEE7E378 D3CD6F3172055B68 87B9D4972B95C693 CEBEE671DDF4C409 FA37F5C10E8CBA57 63AA63025119D6E3 0B3F40282C215752 DB41D20259F216D0 DA24B46236D37A10 0BF2A2D2A6FA765C 6E7DC014AB40EC9F 61B872AAF71599AA B2DB553B282C394B 577B322934AB31C6 9D67F13C7CE3233D B8D57ED8FBD05C18 2BC49CEA591CF403 44CE9A3EF39AC4F3 32E413BC2568AFB7 1738049CBBD82E80 CEC5911D68E68842 7B6593999D0E2E51 8A8F9F8121983F96 5FAB06B8055844BA 439F17BF58BCE53B FF4FC1BE311B7193 344C28AA06C3F4A9 C94F65D82008D6CD F1BBD93571C606BE 48F93BBA6402C313 FF754CA00539D7F2 7D55A29EE45ADBD8 35FC4B4184B396F8 397DC85FEC378A35 850DE17960160F2F BB0FD2E6D2A50E23 5CA54CB5E91758F2 387499D4D0966FFA E2655CB277A797B3 EB2660807EEF8354 CDA0247D217E1E1F A163247615254FE5 9B0A4A2017861CAB E99D718FCE73B234 A6A87B7E9986A600 02BAAD049E567110 1157D88D4A138794 6D94F29CB78BE2C0 B4127C73F68C1412 5FA59AB32158CB57 F030E41594D8EC96 247412246BE5AEAC 913887DA45E19935 32B0C1767FED7ADE 27E078D5497805B5 730A15B1DF4602E6 3FE8B85D3477FFAC 4C0D97CF7EAAF5FC 774D069588E04DDA DB91A059017F4104 9329F98CF04762FA 93F70D3C05335369 8386FF12E768C3D9 6BACAB014F1ABD0B 624E3F078EF61BDE 63EBD2E1581713B2 B6AADF28CB19E2FF 845ED4F1F34148EA 03BE7E4D6871B81C 60BC98163FFF3AD2 01811FB531E4C0FC 54CA760236609753 4BFA6B11D30E6566 853FF9723ACF722A C97F35B64FAC37EE D1D341A9AA8C4F24 B35C3B93C2563678 6582B176656C52F2 905468E871CA54B1 62C84FCB32D0E1D5 FB5FD1C0A0D9F82D DE27368F00CBE1C2 DD7C1486307B5E7A FCCDEB1126B0059E 5BEC8C86DF2541FE 7F1424FC369E9384 4446E29A67FF8D0A 316FC008EDD2F0F0 AF31F384F01FE46B 52985A15180E53AA D0BB396C5E24C67F F55417CFBAA06AB0 647593F4818F184F 1B62858C890E7C11 4C23295B6E070C15 DA202D9EED3A3CB9 C9F78E0E1743D5B3 EF48A45A130D0532 700DACFD969D103B DF0617896BD260DD A86CAC5DE365D6BE 16B1B8542816E017 57F51C042644FF3E 4C85C191514F3F12 F3C75638C0422283 AD7754D4F939C4E4 463EEE00E86C654D 7ED994593C06E2FA 8FAE06C006EBD5FC EF5466B540E82545 658CC53A97D0D6B6 901B9E067F223FF8 CF6103AA2554972B 761E3312F094B12D BFA4BD7617795AB7 7E6D2F0CD67E5639 EB8A0AFA1038047E 40386E272C63E17F EBA1D12CAB1C56C1 EC617D23A271459F B2E5FE4A7501F1A9 DDF2961B6585A06D 00923D6242655B18 E5AA10AB7B5C1526 5E7EF430211686E1 0D4DB15E9D71F93B 3B3E653B3507E175 D9F24E589D8E14A5 63D499FFC2A12042 CCE238B71A5AD399 7804A64EACADB0B7 B937FE58417AF362 4C2C5C418D4AB089 CFDD130B89341C91 B3C99E18E33BCC31 42DC2F1A8E7C053D 1672BE5C13CF534B A73E0D3183D9EEAE 85DD34717F178D56 7781ECFA5F13437F 28129A9C64AC8F59 F12CACE2EA898BAC C451D89FBF1B6F30 0F17BDA32186F0C0 796E3AF25A8EFF83 38577C22F90410A6 455EE3F459E388D1 31E2289D53F07859 F5E8261A2AAF45C5 0BC14337AC6E9A10 4F11B2707D0402D9 4B6C61D243D3E0B0 2000DE20E2451424

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201303302334 (name+title). Key = MD5(password) = f483b655dbe0de7f9237eeae7af71ac2, 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 6b4b7e53-de40-532b-8a1a-1a84cc13b549
  2 8a1a05db-356b-1487-916b-570b11b4cb58
  3 c00c841e-9fd7-6d77-82a8-ba0a4e3a39cd
  4 6d74f075-9c43-44b4-bc10-43450942746b
  5 ebcf5f7f-1121-25c9-ab26-7536b51ebc06
  6 98a4b0ce-6c61-5337-b89e-d555f1334379
  7 d1aed685-8cbd-7d4e-adc3-38978de48e08
  8 6018a305-ab04-4fc3-8d39-46401e526cdd
  9 a479b560-bce3-3d65-bd18-25e3961709a4
 10 11a739eb-9647-146d-a110-31321c63a8b2
 11 8f9aa199-c462-54b3-8b57-76f86ca119e1
 12 74c2faac-b872-8907-a3b2-3793f4089ba4
 13 b90b53a1-b7aa-45a4-aacc-0c0cb4a1e2c4
 14 895d1ff6-2433-8831-82d0-26f54ff66e0c
 15 51109d88-79ed-59b3-a225-e5e48645e3b7
 16 f80a07c6-83b4-82c3-a7c1-c779a8c5f353
 17 def491e1-b999-5f47-a988-a36973481120
 18 cc4a29c2-f2c9-13e8-b949-41fe77f5480f
 19 df6ceb1f-a9f6-354d-92f5-b43cd2ae72bb
 20 8a7a456d-7e6c-5f3e-a671-2962e234f8c9
 21 14d15cec-c1b8-852f-854e-77a682c2cca7
 22 cb312f5f-c752-4fca-879c-c89ce164eb6b
 23 e5603ac4-d463-3a6d-ab45-5582dbbe22e1
 24 a5110f1f-5c0e-88e3-8266-170999ffc337
 25 410f426f-7256-29cd-bc06-7060f630cb2b
 26 54a406fa-8b9e-0ba8-bd3f-682b04b85318
 27 ac3acba7-b071-29bc-8e0e-738a2dae6b37
 28 19fae391-306a-57e6-a8ae-635fdef1e911
 29 9fe6576f-0dbb-2c0b-9d83-1933737e6ce6
 30 a5685c76-a19d-754e-b38b-6e70b7691cf2
 31 07607449-b896-32e6-9ae1-222cd620dff9
 32 acf507f9-8604-2e30-b5f0-f1fc9e556d3f
 33 0dcaf546-1174-7025-8af8-463576a75450
 34 c680c74c-aad6-494a-b533-3b3166f570cb
 35 8b7aea2f-e162-3298-a778-c50a87bdd185
 36 e88080a4-6d67-42f4-b400-1bebdd352722
 37 74476612-00d8-80e3-b476-706578919d19
 38 2d3c9cd0-91d8-4140-8802-e292f6f0a315
 39 52d75690-eefd-1c48-a851-e48f423d8d1d
 40 82ee01e8-13d7-7728-965a-b0d9b425df6a
 41 c2b1fcd5-bb63-866d-b953-009475df913b
 42 b374917a-f0f4-39a8-ac9a-710b2c180b42
 43 5855c7f8-728e-6a50-b253-2516456fc7b4
 44 061933ec-e40f-1bfd-a9e2-811ff98e30fa

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 51642574315848585135843820252732743484178361. Exactly this sequence comes out of new Random(618).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 93 of Run 43 (seed 120,022,078): new Random(120022078), 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 2013-03-21 09:44–10:39).
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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