1. ‫ابراهیم‬ ‫بیژن‬
‫»عضو‬‫مشهد‬ ‫لینوکس‬ ‫کاربران‬ ‫گروه‬«
MashhadLUG.org
@bijan@quitter.se

2. ‫آوریل‬ ‫اول‬ ‫دروغ‬۲۰۱۴
“April 1st 2014, the aftermath”
‫مشهد‬ ‫لینوکس‬ ‫کاربران‬ ‫گروه‬

3. Apr 01 15:36:46 (IRST)
Freenode
[Global Notice] For purely non-profit reasons,
all your nickserv accounts have been converted
into freenode+ accounts; details at
http://blog.freenode.net/2014/04/googleplusfree
node/. Thank you for using freenode.

4. http://blog.freenode.net/2014/04/googleplusfreenode/

5. ‫آوریل‬ ‫اول‬ ‫دروغ‬
“April's Fool”

6. http://blog.freenode.net/2014/04/googleplusfreenode/

7. “base64”
Binary to Text encoding
The '==' sequence indicates that the last group
contained only one byte, and '=' indicates that it
contained two bytes.

8. $ echo “IyMjeGtjZCM=” | base64 -d
####xkcd
IyMjeGtjZCM=

9. ####XKCD
Welcome to Level 1!
Clue: Tnl2cHItbmFxLU9iby1qbnl4LXZhZ2Itbi1vbmU=
All channels in future follow the same pattern of having
four (4) #.

10. $ ciphertext = “Tnl2cHI...Z2Itbi1vbmU=”
$ echo $ciphertext | base64 -d
Nyvpr-naq-Obo-jnyx-vagb-n-one
$
####XKCD

11. “ROT 13”
substitution cipher
ROT13 is a simple letter substitution cipher that
replaces a letter with the letter 13 letters after
it in the alphabet.

12. $ ciphertext = “Tnl2cHI...Z2Itbi1vbmU=”
$ echo $ciphertext | base64 -d
Nyvpr-naq-Obo-jnyx-vagb-n-one
$ alias rot13="tr a-zA-Z n-za-mN-ZA-M"
$ echo “Nyvpr-naq-Obo-jnyx-vagb-n-one” | rot13
Alice-and-Bob-walk-into-a-bar
$
####XKCD

13. ####Alice-and-Bob-walk-into-a-bar
Welcome to Level 2!
Clue: MKWkpKMa

14. $ ciphertext = “MKWkpKMa”
$ echo $ciphertext | rot13| base64 -d | rot13
reddit
$
####Alice-and-Bob-walk-into-a-bar

15. ####reddit
Welcome to Level 3!
Clue: Shg5RkR4SUpIeHFGSnlXVUlJSVFJeHFKCg==
4 decodes needed

16. $ ciphertext = “Shg5RkR4SU...SVFJeHFKCg==”
$ echo ciphertext | base64 -d | rot13 | base64 -d |
rot13
EBEORIETEMETHHPITI
$
####reddit

17. EBEORIETEMETHHPITI

18. “EBEORIETEMETHHPITI”
Zodiac Killer
The Zodiac Killer was a serial killer who
operated in northern California in the late
1960s and early 1970s. The killer's identity
remains unknown.

19. ####zodiac
Welcome to Level 4!
LaTeX right direction | Google! | No maths needed

20. “LaTeX”
LaTeX
LaTeX is a document preparation system and
document markup language. It is the de facto
standard for the communication and publication
of scientific documents in many fields.

21. $ echo -E "-nablacdot Q_s =
varepsilon_ofrac{partialeta}{partial t}"
>> formula.tex
$ tex2im formula1.tex
$ feh formula1.png
####reddit

22. -nablacdot Q_s =
varepsilon_ofrac{partialeta}
{partial t}

23. ####exner
Welcome to Level 5!
Save this for a later level

24. $ strings SandvWX.gif
####Kolmogorov
terrible_small_logo.pngUT
secret.txtUT
VA3Sux
$ grep -iao "#{4}[a-z]+" SandvWX.gif
####Kolmogorov
####Exner

25. “Steganography”
Steganography
Steganography is the art or practice of
concealing a message, image, or file within
another message, image, or file

26. $ ls
1.jpg 2.jpg secret.txt
$ cat 1.jpg secret.txt 2.jpg > big.jpg
$ grep -ai “secret message” big.jpg
This is the Secret Message hidden!
$
Simple Steganography in Linux
+ Secret + =

27. “Magic Number (Programming)”
Magic number
Magic numbers implement strongly typed data
and are a form of in-band signaling to the
controlling program that reads the data type(s)
at program run-time. Many files have such
constants that identify the contained data.

28. $ od -N 4 -t x1 1.jpg
0000000 ff d8 ff e0
$ bless big.jpg
Bless, GNU/Linux

29. ####Kolmogorov
Welcome to Level 6!
Clue: https://dropbox.com/s/emz7...9ivxe/wat.unknown

30. $ file wat.unknown
wat.unknown: JPEG image data, JFIF standard 1.01
$ mv wat.unknown wat.jpg
$
####Kolmogorov

31. Wat.jpg

32. $ strings wat.unknown
$ grep -aio ".+.[a-z]{3}" wat.unknown
...
pB.Ifa
two.tar.gzU
$ 7z e wat.unknown
$ tar zxvf two.tar.gz
surprise.txt
ra.jpg
$ cat surprise.txt
####ImSoMetaEvenThisAcronym
####Kolmogorov

33. # apt-get install outguess
$ outguess -k "key" -d hidden.txt monkey.jpg out.jpg
Steganography, GNU/Linux
$ outguess -k "key" -r out.jpg message.txt
# apt-get install outguess
$ outguess -k "key" -d hidden.txt monkey.jpg out.jpg

34. ####ImSoMetaEvenThisAcronym
Welcome to Level 7!
Clue: AqwPfPN1Z...fVQYPfPNlZBXNfvNkAP4jZhXNflOS
and "Da Vinci" | Jules Verne

35. $ ciphertext=”AQwPfPN1ZXNf...PlZBXNfvNkAP4jZhXNflOS”
$ echo $ciphertext | rot13 | base64 -d
48° 50 0 N, 2° 20 14.02 E′ ″ ′ ″
####ImSoMetaEvenThisAcronym

38. “48° 50′ 0″ N, 2° 20′ 14.02″ E”
Paris meridian
The Paris meridian is a meridian line running
through the Paris Observatory in Paris, France—
now longitude 2°20′14.03″ east.

39. Paris meridian
Rosslyn Chapel's entrance was
more modest than Langdon
expected. The small wooden door
had two iron hinges and a simple
oak sign, Roslin.
Main Article
Rose Line
Dan Brow'
The Da Vinci Code

40. ####Roslin
Welcome to Level 8!
Clue: UIVXUJZIULMJCAGLKHKTOLUPSRDD

42. Playfair Playfair
1 key needed 1 key needed
Two-Square Two-Square
2 key needed Possible Cipher
Four-Square Four-Square
2 key needed The Cipher

43. ####Roslin
$ python
>> from pycipher import Foursquare
>> from string import letters
>> from collections import OrderedDict
>> def uniq(key):
return "".join(OrderedDict.fromkeys(key))
>> key1 = uniq('IRC'+letters[26:]).replace('Q', '')
>> key2 = uniq('XKCD'+letters[26:]).replace('Q', '')
>> fsqr = Foursquare(key1, key2)
>> fsqr.alpha = letters[26:].replace('Q', '')
>> fsqr.decipher('UIVXUJZIULMJCAGLKHKTOLUPSRDD')
'POVAROVOSOLNECHNOGORSKRUSSIA'
>>

44. ####PovarovoSolnechnogorskRussia
Welcome to Level 9!
Clue: OGUCSSGAPVGVLUMBTVOGICUNJDHSTB |
RUTJJGNXUNTY
Letters that would repeat in a typical word do not
repeat in the key(s), example 'freenode' would be
'frenod'

45. “PovarovoSolnechnogorskRussia”
Povarovo, Moscow Oblast
Povarovo is an urban locality in
Solnechnogorsky District of Moscow Oblast,
Russia. located 30 kilometers (19 miles) from
the federal city of Moscow. The UVB-76 radio
transmitter was thought to be located near
Povarovo.

46. “PovarovoSolnechnogorskRussia”
Povarovo, Moscow Oblast
Povarovo is an urban locality in
Solnechnogorsky District of Moscow Oblast,
Russia. located 30 kilometers (19 miles) from
the federal city of Moscow. The UVB-76 radio
transmitter was thought to be located near
Povarovo.

47. “The UVB-76 transmitter”
UVB-76
UVB-76, also known as The Buzzer, is the
nickname given by radio listeners to a
shortwave radio station that broadcasts on the
frequency 4625 kHz. It has been active since at
least the late 1970s or early 1980s.

48. ####PovarovoSolnechnogorskRussia
$ python
>> from pycipher import Foursquare
>> from string import letters
>> from collections import OrderedDict
>> def uniq(key):
return ''.join(OrderedDict.fromkeys(key))
>> key1 = uniq('RUSSIA'+letters[26:]).replace('Q', '')
>> key2 = uniq('UVB'+letters[26:]).replace('Q', '')
>> fsqr = Foursquare(key1, key2)
>> fsqr.alpha = letters[26:].replace('Q', '')
>> fsqr.decipher('RUTJJGNXUNTY')
'AARONHSWARTZ'
>>

49. ####AaronHSwartz
Welcome to Level 10!
Clue: HKGJSUOJVRLGSBEL...RURWMGTUGJGWTKN

50. “Aaron H.Swartz”
Aaron Swartz
Aaron Hillel Swartz (November 8, 1986 –
January 11, 2013) was an American computer
programmer, writer, political organizer and
Internet activist.

51. ####AaronHSwartz
Aaron H.Swartz
Developer
RSS (web feed)
Creative Commons
web.py (website framework)
W3C (RDF-Core working group)
Authored / Co-creator
Infogami (Merged with Reddit)
Tor2web (HTTP proxy for Tor)
Markdown
Wikipedia

52. ####AaronHSwartz
Aaron H.Swartz
Activism
Watchdog.net (the good government site with teeth)
Progressive Change Campaign Committee
Demand Progress
Campaign against the SOPA

53. ####AaronHSwartz
Aaron H.Swartz
RIP
November 8, 1986 - January 11, 2013
(aged 26)
Demand Progress

54. ####AaronHSwartz
$ python
>> from pycipher import Foursquare
>> from string import letters
>> from collections import OrderedDict
>> def uniq(key):
Return ''.join(OrderedDict.fromkeys(key))
>> key_1 = 'DEMAND'
>> key_2 = 'PROGRESS'
>> key1 = uniq(key_1+letters[26:]).replace('Q', '')
>> key2 = uniq(key_2+letters[26:]).replace('Q', '')
>> fs = Foursquare(key1, key2)
>> fs.alpha = letters[26:].replace('Q', '')
>> fs.decipher('HKGJSUOJVRLGSBE...RWMGTUGJGWTKN')
'JOINUSNOWANDSHARETHESOFTWAREWRITTENBYRMS'
>>

55. ####JOINUSNOWANDSHARETHE
SOFTWAREWRITTENBYRMS
JOIN US NOW AND SHARE THE SOFTWARE
WRITTEN BY RMS
Congratulations on solving the freenode's April Fools
2014 Crypto Challenge

56. 1. booto
2. furry
3. mniip
4. jojo
5. redi
6. BlueShark
7. larinadavid
8. Omniflux
9. apoc
10. thommey
11. knivey
12. Tordek
13. jacob1
14. stac
15. Changaco
16. Arch-TK
17. ar
18. Weetos
19. lyoko1
20. vi[NLR]
21. tkd
22. Chiyo
23. slidercrank
24. jojoa1997
25. Pixelz
26. Transfusion
27. DonkeyHotei
28. sdamashek
29. Cypi
30. FXOR
31. pad
32. skasturi
33. Bloodhound
34. molly
35. Bijan-E
Appril's fool 2014
Winners List
Top ten winners
Cloak lottery winners

57. ‫بعدی‬ ‫آوریل‬ ‫دروغ‬ ‫تا‬
“Till the next April's fool”
@bijan@quitter.se