A858DE45F56D9BC9 archive

201307200919 1io18f

explained decrypted filler

seed 907

Metadata

Post ID
1io18f
Title
201307200919 → 2013-07-20 09:19 on A858's clock
Posted (UTC)
2013-07-20 00:20:00
Timezone
UTC+9 · title 09:19 against posted 00:20 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(A858DE45F56D9BC9201307200919) = 2a964b0814c18c59110c5e7bce08b2f3 (name+title)
GUIDs
44
Filler GUID seed
new Random(907).Next(9) ✓ verified
Run
Run 49 (seed 822,652,546) (seed)
Draw
11 · predicted N = 44 ✓
Machine boot
2013-07-10 11:27–11:29 (seed = uptime at app start)
Sources
community-archive, arctic-shift · body from community-archive
Links
Reddit · Arctic Shift · JSON
Score · comments
10 · 1
Tags
automated (decryptable)2013Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

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
  • Read the ciphertext. Strip whitespace: 2,832 hex characters = 1,416 bytes = 177 8-byte 3DES blocks.
  • Derive the key. Password = A858DE45F56D9BC9201307200919 (name+title). Key = MD5(password) = 2a964b0814c18c59110c5e7bce08b2f3, 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 498859bd-48b5-5ced-9896-34c0fc74aca0
  2 746a9b37-b520-82d4-9d95-d186568d53f7
  3 297cceb1-93e3-65e7-833f-cb6bc7124d67
  4 d37c8cef-8c6a-15c9-9e31-a5d55dab8394
  5 26016716-30f2-6417-a578-77cdb4648d03
  6 9365de7b-cb42-1766-9b06-0ff579139ece
  7 9fcc733a-c760-2580-8b86-903b49ef94a1
  8 6a89fa47-0929-4021-b09e-d1cb3fafc74e
  9 200e21ce-4816-1de1-ac2e-4e24734d6366
 10 3a4c6afe-fca6-65de-84ac-98897007cb9b
 11 5fb6fffd-62c7-477d-b9bf-9a0cea800341
 12 c9d481b7-06e6-5017-985d-49bde3d28cab
 13 0ee2a895-a130-1a7b-a48a-e9dfd2dd9fd0
 14 a77f401f-a56a-30b6-b29e-d1a3d3f590c0
 15 57be3cc3-a1e7-76f6-8abd-71de85f97428
 16 c41be6ad-8fe9-432d-a3a7-20049cdc9aed
 17 456990bb-10a6-1b15-bbea-b71d5ac5c36f
 18 dbd7e3d2-f61f-3d8d-8396-6c0c19467eae
 19 2de0af06-e3a7-2ebe-9b03-8dbe2c9b92a4
 20 ea284c79-fc96-4b1b-8b2b-39024e685833
 21 5cdd7e63-e34a-219f-8471-22fa3747f997
 22 4306fcfb-f2b2-3591-896a-b13174def2a1
 23 a01d9bb8-c23e-2c59-9a56-247e6d5caa6c
 24 848f63f1-0b0f-81b6-b319-71aba0861afe
 25 5fb39c6a-12ee-586e-848a-22b7c553fdea
 26 56f9c869-06f0-802e-a1b6-56566ea14a64
 27 b80cecad-f576-670a-bb3c-94c35d23757c
 28 ea42bdaf-5b28-6325-b912-d3f747c637a8
 29 76f7b345-cd00-0d2e-86a2-6266af020c4f
 30 b990cdbd-4154-4b78-a23a-b40440be1662
 31 7c138aa7-cc7c-0751-87f7-37e2b0eb4299
 32 41589d26-1c80-34b0-9b63-f3a901b44ad0
 33 6f39d2bd-aad5-0d63-abea-da73ada4b739
 34 abd2f8f7-e695-608d-b444-b1d3e218367d
 35 bf28956b-92b3-3b84-b65c-4b04f035e1ef
 36 ac071d04-310d-044e-ad62-0be9989a3ec7
 37 559a4d07-1ec7-32a3-adc6-3a03f03caeb1
 38 9b681778-0405-4a79-9e31-bdb94726f6cb
 39 c84c4433-3760-6a1d-8477-3749820744eb
 40 232de832-d8dc-8e70-86ba-641b80e64763
 41 fc7fdac3-c67f-779a-82e8-f5d83669ad45
 42 efcd2618-f12e-673f-8b48-e9a9a2d78303
 43 605aff9d-5998-0dfd-8d5a-172223bd760b
 44 15512520-9073-8d25-bbd8-d4dd33a235d6

Explanation

  1. Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 58616124164513741324232858660403063034687608. Exactly this sequence comes out of new Random(907).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.
  2. Explain the count. This post is draw 11 of Run 49 (seed 822,652,546): new Random(822652546), 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 2013-07-10 11:27–11:29).
  3. Conclusion. Filler. The content is fully explained by the two RNGs.

Related

Findings: Mask digit · Count RNG & runs