201107040900 igg5w

solved decrypted manual

Tolstoy's 'patriot' quotation. 3DES, key MD5(name).

Metadata

Post ID: igg5w
Title: 201107040900 → 2011-07-04 09:00 on A858's clock
Posted (UTC): 2011-07-04 15:47:10
Timezone: UTC−7 · title 09:00 against posted 15:47 UTC
Author: [deleted]
Account: A858DE45F56D9BC9 main account
Subreddit: r/A858DE45F56D9BC9 the main subreddit
Category: S solved 3DES → text
Content: Quotes
Size: 560 hex characters · 280 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: 16 · 1
Tags: pre-automation2011Solved special postmanualkey: namequotes

From the post to its content

As posted (encrypted)

A4FA90DF76DE97E7 514EDA038C277B0F A84DAD704DE54B52 3AC4705ED0C029B2 C26A4DAE3E914468 3A7E07768A50F366 2B5E599752AF551A ED35473CE50301E3 702E49DFCB104DB2 DBD15B6445B0DA17 AC04BE5E50403238 B86D2BCFC7A9C055 28CEDCE78B942BC3 C4E7454185226FA6 6CA09D0F66C77AFF 97FAE752FA40DA91 21757AFED0FCBF37 887526EEC2136DF5 1D49054311298538 903C0C0485F11FA2 4C379B4BC9F77CE4 B71946CB893E2C50 ABCF36D1A9719C17 CF603F2BF4EF66E8 1016E1548ABFBDD6 8ABC2CEE5F550D16 468ACC41CE790342 8692E117397FFEC0 659C92414B3DE4B0 5F01B790FBE16754 468B0B837CBDCA54 2D24FEDACAD0DCF7 F4DF1962FE0E57CB 761FE0A6D444E845 7A067EA63FD33205

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

Decrypted

"The time is fast approaching when to call a man a patriot will be the deepest insult you can offer him. Patriotism now means advocating plunder in the interest of the privileged classes of the particular State system into which we have happened to be born."
- Leo Tolstoy

Explanation

201107040900 — DES-EDE ECB quotation

Status: verified decryption.

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

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:

f14771bfa5b9bebc1305eb08fdb20a0c41e263fe69c7752cb1375025449c09c2

The output is the Leo Tolstoy quotation beginning: The time is fast approaching when to call a man a patriot will be the deepest insult you can offer him.

Solution summary

Method: 3DES-ECB, key MD5(name)
Result: Tolstoy 'patriot' quotation
Explanation: Community-known text