201303032032 19lz2r

explained decrypted filler

seed 745

Metadata

Post ID: 19lz2r
Title: 201303032032 → 2013-03-03 20:32 on A858's clock
Posted (UTC): 2013-03-04 01:32:52
Timezone: UTC−5 · title 20:32 against posted 01:32 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(A858DE45F56D9BC9201303032032) = 94de498ce671042277d8b64d1eefb2c8 (name+title)
GUIDs: 44
Filler GUID seed: new Random(745).Next(9) ✓ verified
Run: Run 42 (seed 983,934,859) (seed)
Draw: 158 · 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: 10 · 0
Tags: automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

FB1506886E8D3808 B64C608DB4E3C7F4 90E2496E0A656064 850E54F2DE07CEE7 A20E0BB8198487DD 5B603A78F9B551ED 6FD64044EDF14B51 6B5A6DFC93C3924E B9DFA6C537E1DB8F F280A83571883B34 396FD89E4FFB3C57 FCF592D22A1EB9A8 56D4C8C2292F1810 4933A86361B2AE9E 050D30634EFEDBC8 CC14CAE6B3363831 7AF4C404CDD3CDF1 581E0EFFFCEFA9CA 3AB53EC175B38FF5 5238F396BCB5A8BD AA3BACB7E3789457 9B444583D4E39D9F DFAB4C6E1D38C9C5 B60F50DE3F209034 00C30E52E899C83D 663C146ABE8DEF8B C4CEF30E93E52721 32F0F1AA05F3BE5E 93EE1A7B62C70590 888BEAD589FA1275 2B03F2476A27ECFA 83600FDD048D1F1B 94E779041CC91320 D3D6E7ABFEA1F8DB 6075DA90C85BD357 B0A8D8E957C22566 CD7310DC6D7AE2B2 99B9E365ED074F98 5FA118B693F6A380 C33B5339C37B7516 FE70D58C6E0DEE7E A6406292818F3EFE F0E7DF16BE2CBEE1 12DC61888248A320 642A02450442AB97 830CC242447041D5 0B4B4BE54723B0C0 ED722A70EE9033CB 4070DD73CBA39F8E 03D98AAEE59B4DA7 C2EA4F8004D7B3F0 75C0DD29FE208316 E4723EDCC516E449 4A730047919EB19B 20EAB94F88D4271D 2D9262F1963DF2ED 4D2F4E2E0BF6BD21 C6494AF24D5CA327 405604FA831393EF B5FF71B0073AE617 93B09C303FC78827 1AF81FAF79A4567E 0616E54E09CF91CA F86F8714588C888D 79D431C2856BCCDF 6C06A2AE767D57CF 003E08C322C41BA9 B872209C089D440F CCC8790928E6A581 13D5821D00268F24 44FB2E60D73BE857 A082F7598BB66879 4F9B96B612A53E9D 4E74B219AE4F4AE2 686277BD2DFCA8DA 2A3447E2613CCD36 F918A7B90157E3BB 192DE4C2096D1E1E C143805CDA8C4E5D DF2D8DB7BAA6057C C2F054402300FB3C 04DB034D9CE50FB6 35859EB28756F4E2 0651E86956D20A29 17F3148EAC4D3065 E87DC368F7ABB167 79FC87DE5F71D54F A5892514F878D31D AC5A1A4BFBB6AE82 36260FC33B48B854 FF0DB46BA2C77644 1382A985965C04A1 338C1D97113BC686 268B7BCF322393DB 9C252A50BB576DE2 7F273E2DE1B1DF42 FB144E8D4B181256 5D95CE6C35E75969 E9D07E19AE6BDFC2 AC968B5AA4729F44 9E7B9C9B24F38A7D E3A98348E3BF0C0A BD70F55B978C5EB3 3455B370C6A491F5 E181BA21637B2153 C8E391B6EB066769 089D12887F0C114C DE0C7937D020F0AC B7159B22BD0B74E7 C457AD37206DE8D5 75AEDBE4A409EDA2 C3D4D4F1ADA5D5A8 B9C412E9705644F3 0A500E3ECC6B0F18 EA6E5B7D3CAE1FEF 696DE1A7466C4DC1 42593ED1E04871AF E0986D116D0A5E84 8443714B1AABAB50 982D47776BB4CCC2 8DA7200870DF622F C00E679A6CD56093 76A42FAF3467C84E A7EA06CE0B073CAC DA3A17CE90E4A4B6 EB4457DAEF32557D A5BC98809D4CF177 AFAB2E6AE5C14D25 1F6AD09CE0778E61 EFC98E201D413FD2 4077A410D2591CC4 2791A59F5A1AA5B4 4AA5C63C177F098A 4CD77AF9462B026B 267A7CF20CCDE22E 32482ACF24AF90C3 FF725BB9978B8130 FFBABC7AC3CFA24B DBF57A0A16F24E89 FFC61FC8B4B25703 6B11C1FE8BF20CB4 FAE7365107787A66 993D914BE83A1768 51206DE5555D68AD 730E26F00334DEB0 8D9FB28E65016A25 3E379F5B6F4F6699 990214DA09ECEFA1 8B2232A1AA4DFF2C 2AB2463A99F24088 AFE67F6DE7B3ED68 70017C6A2B1F39FF FB569D9582978BE0 740BF2B659AD5D7F B25FA7448D2081CB FE3BE92D839EF6CC 12F076386A991D5F 4E92CE7CB1400B8F 78026850D473709C DE5AA5904FDADFF1 B8FE8C5C921F1FA6 A76AD5BD833D27F3 D1AD8A1EACF26DAC 076AD0391D23D9ED D9BED13C89BEB6E7 2A7933416AA00C55 321615DA36E1F57A 8ED222359742A11D 09CD51BF0939238C 50DBB09C43EEC96A 2EC525480EBC4F70 47964D727F363224 161540348CE98438 35993CFC031B53D8 06E8DFC2ECED2BAF 3809C33112BD2F72 1C455769DC1E9BE3

Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201303032032 (name+title). Key = MD5(password) = 94de498ce671042277d8b64d1eefb2c8, 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 419086bb-9435-8b03-9d3d-dcc8c840c238
  2 9fb05513-19c9-3ff7-a9e7-e7b5b76dc930
  3 d8aaf620-a2d5-4ac9-b5a2-68deb52c9891
  4 a0ee2030-8cdd-5352-90da-2595ffdacfd4
  5 0b098025-814f-5a9b-ba5a-25b2931b7b53
  6 a4055455-f52a-539b-ad2b-2204a793ad5a
  7 279b6380-9d86-6d6f-a013-68a82c1f9b14
  8 02229083-38de-1aea-975a-486f2a63cea0
  9 528815b1-c6ba-12f8-a14e-4e5797496d73
 10 7af36aa6-b2ed-8e79-bd51-c265b57ec8ae
 11 610f1f8f-5e05-1dff-96d1-b84dabe91240
 12 e3fa0a63-e110-0de0-8f54-b239a632dcf0
 13 26f8d3d1-92fb-7623-aa2a-133dc4fa48a2
 14 47a95950-f9a1-0017-a724-7720c9054d06
 15 fa3bab5c-1474-4e70-b15e-823470283edb
 16 b4fc506c-81a3-2c49-a23e-8879251e2ccf
 17 e9b6374c-e483-012c-aa06-5af3408d66df
 18 b14c9eb0-b9be-8116-862b-3fbd0eca7058
 19 df7139fb-0dd7-7f56-87fe-f0e536f8f845
 20 ec9e56ce-5455-75cc-9afe-70cc078844f5
 21 2d21d454-e2a4-7e30-8e36-86af3ee0fce4
 22 ab57ec5f-6387-52d7-9d24-552e713c525c
 23 06195a42-b6c8-81d5-8ab1-6389da1af981
 24 0fe4cd1c-baee-26a3-8547-742a07e0a34e
 25 fcabbddf-a629-6396-afc7-d45aff2e8fe5
 26 99433303-26c8-601e-8a2d-ff1e1fb30447
 27 36229a9e-5de3-460f-b57a-8bddac18f507
 28 f9af0d3d-7ab5-2f1d-ac62-e1e8775ed7b3
 29 41800cfa-9f63-2436-ba8a-74cf19acd01d
 30 64aab2b2-c7c6-0da8-83b5-82200f76a359
 31 58b94a6b-60a2-2960-88a6-05ae0ef0c6f8
 32 67d52435-91ab-6b15-ae4d-d6edfbf30aaa
 33 5a39d31c-d6be-7fb9-a59b-a8235755efd1
 34 e652ab55-9e12-596e-a1eb-606caaf1e3e7
 35 00c2cc6a-5a0a-73be-9ab4-5ad3d3a87a87
 36 7ffc38d3-60ee-0944-ac88-96d0f89a8215
 37 dc12bc4a-a65e-1975-a23c-c9b5c74513b7
 38 c4272b7d-07e1-045f-8498-39f888667bcd
 39 cccda174-8e17-8a69-89d7-53eaa67a8eb6
 40 cb6877fd-00dd-8dbd-8f16-38fde5586c0a
 41 e18946af-235c-3000-bae0-a3e65f5f6574
 42 b40b0d9d-80b8-6529-8f8b-2890ab19723d
 43 dfda6260-a751-3152-a1ab-9841d4423fff
 44 bf000e09-449e-5a96-a396-f4d293e26fac

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 83455561181070420877758266422026757010883635. Exactly this sequence comes out of new Random(745).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 158 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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