[Original writeup](https://github.com/shiltemann/CTF-writeups-public/tree/master/DefCamp-2018#misc-message)

## Misc: Message

**Challenge**

I just typed this secret [message](https://raw.githubusercontent.com/shiltemann/CTF-writeups-public/master/DefCamp-2018/writeupfiles/message.txt) with my new encoding algorithm.

**Solution**

```
wsxcvasdfghrfvbnhytqwertymnbvcdrtghuzxcvbnwsxcdeasdfghzaqwdrtgbzxcvbn
qwertywsxqwertynbvcxswefrqwertyiuyhnbvqwertywsxcvfrasdfghzaqwdrtgbzxcvbn
qwertywsxasdfghiuyhnbvasdfgh zxcvbnytrfvcxqwertywsxasdfghzaqwdrtgbqwertymnbvccdertgzxcvbnedcvbasdfghefvtzxcvbn
asdfghwsxcfezxcvbnedcvbgtasdfghzaqwdrtgbqwertyxsweftynhzxcvbnjmyizxcvbn
zxcvbnrtyuihnzxcvbnwsxcdeasdfghrgnygcqwertyrtyuihnasdfgh qwertyqazxcdewzxcvbnredcfzxcvbn
zxcvbnwertyfvzxcvbnrfvgyhnasdfghwsxcdeqwerty qwertynbvcxswefrzxcvbnmnbvcdrtghuzxcvbnrfvqwertyxsweftgbqwertyrtyuihnqwertywsxasdfghxsweftgbzxcvbncvgredasdfgh
[..]
```

is this writing pattern on the keyboard? looking at sequences of letter that are adjacent on a keyboard we
see that `wsxcv` could represent an `L` shape? `rfvbnhyt` an `O`, etc? we do some of these replacements and
see legible text appear, looks like Lorem Ipsum text, we slowly piece together the text and all the replacements.

The following program will deciper the message:

```python
replacements = [('mnbvcdrtghu','R'),
('efvgywdcft','W'),
('nbvcxswefr','P'),('mnbvccdertg','P'),('nbvcxswerf','P'),
('zaqwdrtgb','M'),('xsweftynh','M'),('xsweftyhn','M'),
('xsweftgb','N'),('zaqwdvfr','N'),('xsweftbg','N'),
('rfvbnhyt','O'),('qazxcdew','O'),('wsxcvfre','O'),
('rfvgyhn','H'),('edcftgb','H'),('wsxdrfv','H'),
('iuyhnbv','S'),('ytrfvcx','S'),
('rtyuihn','T'),('wertyfv','T'),
('wsxcvfr','U'),('edcvbgt','U'),
('grdxcvb','A'),('zsefvcx','A'),('xcvbgrd','A'),
('rfvbhg','B'),('wsxcfd','B'),('qazxds','B'),
('wsxcde','E'),('edcvrf','E'),('tgbnhy','E'),
('wsxcfe','D'),('yhnmku','D'),('edcvgr','D'),
('cvgred','G'),('cvrged','G'),('redcvg','G'),
('edcfby','K'),('qazsce','K'),('wsxdvr','K'),
('rgnygc','X'),('wdvtdz','X'),
('ewsxc','C'),('redcv','C'),('trfvb','C'),
('redcf','F'),('trfvg','F'),('ewsxd','F'),
('wsxcv','L'), ('edcvb','L'), ('rfvbn','L'),
('wdcft','V'),('efvgy','V'),
('efvt', 'Y'),('jmyi','Y'),
('wsx','I'),('edc','I'),('rfv','I'),
('qwerty',''),('asdfgh',''),('zxcvbn','')]

with open('message.txt','r') as f:
m = f.readline()

for i in replacements:
m = m.replace(i[0],i[1])

print(m)
```

which outputs the text:

```
LOREM IPSUM IS SIMPLY DUMMY TEXT OF THE PRINTING AND TYPESETTING INDUSTRY.
LOREM IPSUM HAS BEEN THE INDUSTRY'S STANDARD DUMMY TEXT EVER SINCE THE 1500S,
WHEN AN UNKNOWN PRINTER TOOK A GALLEY OF TYPE AND SCRAMBLED IT TO MAKE A TYPE
SPECIMEN BOOK. IT HAS SURVIVED NOT ONLY FIVE CENTURIES, BUT ALSO THE LEAP INTO
ELECTRONIC TYPESETTING, REMAINING ESSENTIALLY UNCHANGED. IT WAS POPULARISED IN THE
1960S WITH THE RELEASE OF LETRASET SHEETS CONTAINING LOREM IPSUM PASSAGES, AND MORE
RECENTLY WITH DESKTOP PUBLISHING SOFTWARE LIKE ALDUS PAGEMAKER INCLUDING VERSIONS OF
LOREM IPSUM.
DCTF{B66ECAAA90AD05DF5DAB33D71A8F70934408F3A5847A4C5C38Dqazxds75891B0F0E32}LOREM
IPSUM IS SIMPLY DUMMY TEXT OF THE PRINTING AND TYPESETTING INDUSTRY. LOREM IPSUM HAS
qazxdsEEN THE INDUSTRY'S STANDARD DUMMY TEXT EVER SINCE THE 1500S, WHEN AN UNKNOWN
PRINTER TOOK A GALLEY OF TYPE AND SCRAMBLED IT TO MAKE A TYPE SPECIMEN BOOK. IT HAS
SURVIVED NOT ONLY FIVE CENTURIES, BUT ALSO THE LEAP INTO ELECTRONIC TYPESETTING,
REMAINING ESSENTIALLY UNCHANGED. IT WAS POPULARISED IN THE 1960S WITH THE RELEASE OF
LETRASET SHEETS CONTAINING LOREM IPSUM PASSAGES, AND MORE RECENTLY WITH DESKTOP
PUBLISHING SOFTWARE LIKE ALDUS PAGEMAKER INCLUDING VERSIONS OF LOREM IPSUM.
```

and contains our flag \o/

**Flag**
```
DCTF{B66ECAAA90AD05DF5DAB33D71A8F70934408F3A5847A4C5C38DB75891B0F0E32}
```

Original writeup (https://github.com/shiltemann/CTF-writeups-public/tree/master/DefCamp-2018#misc-message).