201108071741 jbnny

solved decrypted manual

A quotation: 'Better beans and bacon in peace...'. 3DES, key MD5(name).

Metadata

Post ID: jbnny
Title: 201108071741 → 2011-08-07 17:41 on A858's clock
Posted (UTC): 2011-08-07 17:41:03
Timezone: UTC · title 17:41 against posted 17:41 UTC
Author: [deleted]
Account: A858DE45F56D9BC9 main account
Subreddit: r/A858DE45F56D9BC9 the main subreddit
Category: S solved 3DES → text
Content: Quotes
Size: 448 hex characters · 224 bytes
Cipher: 3DES-EDE2 (two-key Triple DES), ECB, PKCS7
Key: MD5(A858DE45F56D9BC9) = 34a14a42e98ff96095af56604e290cae (name)
Sources: community-archive, arctic-shift · body from community-archive
Links: Reddit · Arctic Shift · JSON
Score · comments: 27 · 9
Tags: pre-automation2011Solved special postmanualkey: namequotes

From the post to its content

As posted (encrypted)

1C326DEAD01C40 AE67BE3769D8D3 5CA8434AB6B765 CAB8FF6E55CDA6 81F32B333843D6 7F6EA18160E3B3 8441176FC01E8C 627106AEEC9043 3E31514EF3F161 F3282FF88A066B C12830AD3C7B09 4FF3A0FF7D1A25 84E6D53CF61374 D77E7B49D45D2A 923EBD4D8CAD69 28138FB4B8FD25 7487E2C9E04312 185EEC58F8E1C7 91E2D5D2816A78 6D5291C693F2BC E6094EADEEA0BB CCEDB61B7BFC70 3A05B40929DBDE 3FAC9B8B537D31 9137C23CC371F6 1EE035AA410A85 A3926F8E448E27 54292DDB7980CA 3D79CABC459804 FF5CE0CB069CED 04C4FFD8A94403 3EB838AFDF68CE

Decrypt. Key: MD5(name) ECB. 3DES-EDE2, then strip the PKCS7 padding.

Decrypted

"Better beans and bacon in peace than cakes and ale in fear."
       -Aesop
          __      _.._
       .-'__`-._.'.--.'.__.,
      /--'  '-._.'    '-._./
     /__.--._.--._.'``-.__/
     '._.-'-._.-._.-''-..'

Explanation

201108071741 — DES-EDE ECB quotation

Status: verified decryption.

This is one of six 2011 posts that use the same recipe (the others: igg5w, j7525, j7xpy, j95o6, jb62l):

Decode the body from hexadecimal.
Use DES-EDE (two-key Triple DES) in ECB mode with the 16-byte key MD5(A858DE45F56D9BC9).
Remove the PKCS#7 padding.

The SHA-256 of the plaintext, for checking a decryption byte for byte:

e793e8779225e3383123762666b88199b0b3cf77e82b87b85736e5035bd8bb7a

The output is the Aesop quotation Better beans and bacon in peace than cakes and ale in fear, followed by ASCII art.

Solution summary

Method: 3DES-ECB, key MD5(name)
Result: 'Better beans and bacon in peace...' quotation
Explanation: Community-known text