A858DE45F56D9BC9 archive

201303011650 19hk1d

explained decrypted filler

seed 420

Metadata

Post ID
19hk1d
Title
201303011650 → 2013-03-01 16:50 on A858's clock
Posted (UTC)
2013-03-01 21:50:54
Timezone
UTC−5 · title 16:50 against posted 21:50 UTC
Author
[deleted]
Account
A858DE45F56D9BC9 main account
Subreddit
r/A858DE45F56D9BC9 the main subreddit
Category
F3 filler: 3DES(name/title) → GUID list, seed known
Size
2,576 hex characters · 1,288 bytes
Cipher
3DES-EDE2 (two-key Triple DES), ECB, PKCS7
Key
MD5(A858DE45F56D9BC9201303011650) = 73d60836ad46cec40148dff6cb64174d (name+title)
GUIDs
40
Filler GUID seed
new Random(420).Next(9) ✓ verified
Run
Run 42 (seed 983,934,859) (seed)
Draw
111 · predicted N = 40 ✓
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
4 · 0
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: 2,576 hex characters = 1,288 bytes = 161 8-byte 3DES blocks.
  • Derive the key. Password = A858DE45F56D9BC9201303011650 (name+title). Key = MD5(password) = 73d60836ad46cec40148dff6cb64174d, used as a two-key 3DES key.
  • Decrypt. 3DES-EDE2 in ECB mode, then strip the PKCS7 padding. The plaintext is 40 GUIDs as hex (shown below).

Decrypted: GUID list

  1 3ed41e62-8a25-1843-b2ed-78d13ff8adac
  2 45973579-c767-037c-8265-1969dcb5f05c
  3 1fbe6c6c-49c9-3c64-b0cf-e217f9062996
  4 9e9b0fbb-d76f-1207-a593-f40a925c51ff
  5 965ffefc-fbfc-78a3-a120-c9ec0095fad9
  6 4efbf195-4712-5a16-bfc1-55b13bcc8714
  7 406b4d5f-f526-097e-b5b6-9350432634d3
  8 1a6848f5-9964-1825-af93-e943e1669c02
  9 aaf0b76e-8b3e-8246-86f4-ee7bce2a1bc0
 10 ecd9140c-d6e5-1a8d-80cd-3543df152fc0
 11 37fa5f62-12f3-6597-aa02-e2f94f5f8cfe
 12 31f30578-426b-3314-a9f8-9379ccf17098
 13 f8c4f451-e609-3805-9c5d-1f846dc44b87
 14 a207ccab-1500-82c0-ad4a-fcc26ec3f1e1
 15 fcf9bc2c-065a-8132-9201-1c05295047a8
 16 8c6e9a1d-8838-2a17-9641-70a34f72dd89
 17 6a9ad5f4-87ef-37fd-ae31-8d710094e268
 18 9151f8d3-b2c1-37dc-ba4b-944e6e861760
 19 2b77776e-6c9e-0365-9c9b-be5419564a8f
 20 5ffcd61d-bb15-81ad-b4a9-80b6f1cc62ff
 21 1c83a936-3dcb-504b-bcf7-87f6e543b4f9
 22 4a01297f-2f58-899b-ab27-3a97e4b695fd
 23 010aaa3d-c65f-81fd-aba9-7cf361f406c3
 24 d24c15fd-9825-6bf0-9aa7-6569e14064da
 25 432cb57d-45bc-77bc-a740-c4e4e1a85814
 26 60cfe18d-31c5-57ef-8862-79c4f9d19379
 27 3809e3ac-6260-01e5-a0ac-1cb676e3ced1
 28 6a800ebc-6f2b-8cbe-84c8-b38b055d0e36
 29 f9312120-5fd1-5d08-8a33-5d147d564b90
 30 313195e2-f741-25c6-bad5-cceaf9314806
 31 c47923f0-0d8b-28bc-a36d-b6cfd7f60ef2
 32 d8fd65ee-1194-03c7-975d-adc25fd38775
 33 1bc77f2e-35f6-10dc-be63-795091ae13e3
 34 41448a36-b8a4-4346-8347-93492633cf54
 35 0624d83e-e97f-2754-a011-be3af4f95c3d
 36 7d458f39-ffe9-89e6-83d8-7963db9e2b1f
 37 0a31e783-4d02-8bf6-a5e8-d32c83595bda
 38 48bbdd35-4c74-5818-b107-22f44f91433b
 39 130e3b18-d62b-20d5-b01a-8beaf079b002
 40 083825dd-5ac6-3a79-bacd-27de4c6fe2a7

Explanation

  1. Explain the mask digits. The version nibble (13th hex digit) of each GUID, read in order, gives 1031750181633882330858867508522014288523. Exactly this sequence comes out of new Random(420).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 111 of Run 42 (seed 983,934,859): new Random(983934859), 4·Next(8,16) per post. The RNG predicts N = 40; the post has N = 40 ✓. The seed is the machine's uptime in ms when the app started (boot 2013-02-13 10:26–11:32).
  3. Conclusion. Filler. The content is fully explained by the two RNGs.

Related

Findings: Mask digit · Count RNG & runs