Skip to content

Internetwache CTF 2016 writeup Crypto 50

Posted in 未分类

This time the games are easier and more interesting than the games I had played in 2016.I achieve the crypto 50 and web 90,I’d like to share my write ups with all of you.

Crypto 50

Description: Did the East German Secret Police see a Pirat on the sky? Help me find out! Hint: We had 9 planets from 1930–2006… Hint2: Each planet has a number. (There’s a table on a well-known website). After that you might be interested in ciphers used by the secret police.

At first, one of my teammates finded the ‘well-known’ website,ok,it’s wikipedia,he finded that the symbols provided represent the nine planets of solar system,and he transformed the symbols to a series of number.

82928 99283 92928 98983 89899 28983 89898 98983 89929 28392 83928 38989 92898 39292 83898

98992 83898 98983 89898 98392 89928 98392 89899 28389 89929 29283 89899 28392 92898 38992 83928 9

9292 83898 98989 83928 99289 83928 98992 83898 99292 92839 28989 83929 29283 92928 98983 89898 98

389 92928 38989 89899 28392 92898 98389 89899 29283 89898 98389 92898 98389 89898 98983 89929 283

92 92898 38983 89899 29292 83928 99289 83929 28989 89839 28983 92928 98983 89898 98392 89899 2838

9 83929 29283 89928 98389 92929 28389 92928 98389 89928 39289 89899 28392 89898 99283 92898 98992

83928 98989 92839 28989 89928 39289 89899 2

And then,I googled ‘East German Secret Police Cipher’ and  finded out a cipher method which is similar to the form of numbers above,it was ‘TAPIR’,I quickly finded a TAPIR to decode these numbers.

I got this:

-.- –.. ..-. …. .– – – ..-. — …- … … -.-. -..- ..— ..- –. .- -.– …. -.-. -..- ..— -.. — –.. … .– ….- –.. …– … .-.. ….. .– –. . ..— -.-. –… -. –.. … -..- . — .-. .— .–. ..- -…- -…- -…- -…- -…- -…-

Yes,it is MORSE CODE,I decoded it and got this:

KZFHWTTFMVSSCX2UGAYHCX2DOZSW4Z3SL5WGE2C7NZSXEORJPU

This series is formed by Upper alphas and numbers,it is typical BASE32.I just decode this,and get:

VJ{Neee!_T00q_Cvengr_lbh_ner:)}

God!I spotted the difference of VJ and IW,I used rot-13 to decode this,get the flag:

IW{Arrr!_G00d_Pirate_you_are:)}

Be First to Comment

Leave a Reply

Your email address will not be published. Required fields are marked *