201210151300 11ioq8

explained decrypted filler

seed 513

Metadata

Post ID: 11ioq8
Title: 201210151300 → 2012-10-15 13:00 on A858's clock
Posted (UTC): 2012-10-15 17:00:24
Timezone: UTC−4 · title 13:00 against posted 17:00 UTC
Author: [deleted]
Account: A858DE45F56D9BC9 main account
Subreddit: r/A858DE45F56D9BC9 the main subreddit
Category: F3 filler: 3DES(name/title) → GUID list, seed known
Size: 2,704 hex characters · 1,352 bytes
Cipher: 3DES-EDE2 (two-key Triple DES), ECB, PKCS7
Key: MD5(A858DE45F56D9BC9201210151300) = 0af36bbd59704d9dbe27b79994360306 (name+title)
GUIDs: 42
Filler GUID seed: new Random(513).Next(9) ✓ verified
Run: Run 36 (seed 335,015) (seed)
Draw: 29 · predicted N = 42 ✓
Machine boot: 2012-10-10 20:54–00:54 (seed = uptime at app start)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 8 · 0
Tags: automated (decryptable)2012Encrypted masked GUID listkey: name+titlerun: seed

From the post to its content

As posted (encrypted)

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

Read the ciphertext. Strip whitespace: 2,704 hex characters = 1,352 bytes = 169 8-byte 3DES blocks.
Derive the key. Password = A858DE45F56D9BC9201210151300 (name+title). Key = MD5(password) = 0af36bbd59704d9dbe27b79994360306, used as a two-key 3DES key.
Decrypt. 3DES-EDE2 in ECB mode, then strip the PKCS7 padding. The plaintext is 42 GUIDs as hex (shown below).

Decrypted: GUID list

  1 a51c0874-a272-6877-9825-0e74ca5d7d22
  2 3b848e8f-4c26-3d58-b945-8c314f5dade5
  3 0eb7cbb3-cb97-3628-90b5-6394a5b71117
  4 ae179ab6-f01f-0f1a-ab48-dced3cdfa706
  5 11e50343-8b68-7d47-849a-9e80ee1910d3
  6 6540102e-0030-786d-b91b-059359e14bf3
  7 95c24c3e-6bda-6d92-9f39-3b05e33284dc
  8 819642ee-33eb-764b-a148-59906ef58859
  9 53f58991-8ce3-32d1-88a3-ef20f425a567
 10 0d992fa0-cbab-3d1e-a908-6e15698b591e
 11 4d0f1fd4-35fd-2d45-941d-644a11c52678
 12 26d66dc0-40e1-8676-a894-c3e7b950cb24
 13 58a2017e-7012-251c-ad2f-3c58a5aa039c
 14 ec5ab3ee-6f8a-3560-85ac-3837221aa287
 15 8c748d5c-28f1-0d87-b571-07f7290c5058
 16 89518231-4244-35a1-bd10-0b48a680100b
 17 23388e1b-98e9-4435-a663-e522ebbf592b
 18 2cbdbdc7-b394-097a-bba6-348b284584d2
 19 9e80b613-d458-546b-b541-090c6eec718c
 20 58dda7b8-8456-8dbe-89a9-a07c4c8678bc
 21 e3e3efe4-3dfd-8221-b9b4-7d763d148ca4
 22 90a03232-957e-6435-b5f3-2d36ce77f911
 23 ffb855fa-474d-66eb-adac-aa047c927e81
 24 d6006b0c-6c74-2059-a260-87378d79c034
 25 34070f1e-c19d-892a-b808-3b4819603819
 26 558b7a9c-7681-4561-8f28-f51a2d3860ac
 27 2d65e7c8-8297-8f08-9007-ffa495a88596
 28 a4d99b1f-40c3-4888-8873-176e56444e83
 29 3b1111c9-fa09-2e0b-9bcc-ed5a4815ee63
 30 b99abbfb-64ab-2ff9-94b5-31b4f19e64b2
 31 fbee3851-9452-505c-9903-8ef986998a51
 32 97990e4b-220f-5628-813d-4fdea311e31e
 33 e49cb6ad-b344-5c38-b2ae-34ec46d4f186
 34 e6d4f0ae-faeb-7acd-a51e-3a64f1cf9a54
 35 b0132307-dedd-63bd-9478-196a6bdeef03
 36 c2947279-4365-8d7a-a3ab-9f2ad9095ede
 37 fb4877aa-a30a-844e-b216-9238b379aa2b
 38 10e0da0e-4914-809c-b65f-49c08ac319a3
 39 861d60d0-4171-1a51-9083-3c33a40701ad
 40 d9cef7c9-3a6f-2a26-87b6-7708e246b256
 41 750b8f8a-af1d-23e5-9ee3-acd4809208d2
 42 c5c4ef08-3030-2178-94e4-1d2a7089bca7

Explanation

Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 633077673328230340588662848422555768881222. Exactly this sequence comes out of new Random(513).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 29 of Run 36 (seed 335,015): new Random(335015), Next(8,64) per post. The RNG predicts N = 42; the post has N = 42 ✓. The seed is the machine's uptime in ms when the app started (boot 2012-10-10 20:54–00:54).
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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