[HackThis!!] [CRYPT] LEVEL 4

Crypt 4번째 문제이다.

Caesar 아니면, 치환 문제일 것이다.

Caesar를 돌려봤는데, 제대로 된 문장이 안나온다. 후자인 듯 하다.

바로 알 수 있는 단어부터 시작해보자.

 
ciphertext = "Dc, gdcl cl h lcrcshn ckqh gz sqwqs guz."
ciphertext += " Gdcl gcrq qhyd sqggqn cl hllcomqk h ljqycacqk nqshgczmldcj ucgd hmzgdqn sqggqn. Jhll: cdhwqancqmkl"
 
# jhll -> pass
ciphertext = ciphertext.upper().replace('J', 'p').replace('H', 'a').replace('L', 's')
print ciphertext
 

처음부터 꽤 많은 글자들이 바뀌었다.

다음 Cs

 
ciphertext = "Dc, gdcl cl h lcrcshn ckqh gz sqwqs guz."
ciphertext += " Gdcl gcrq qhyd sqggqn cl hllcomqk h ljqycacqk nqshgczmldcj ucgd hmzgdqn sqggqn. Jhll: cdhwqancqmkl"
 
# jhll -> pass
ciphertext = ciphertext.upper().replace('J', 'p').replace('H', 'a').replace('L', 's')
 
# Cs -> is
ciphertext = ciphertext.replace('C', 'i')
print ciphertext
 

문장이 슬슬 보이기 시작한다.

GDis

 
ciphertext = "Dc, gdcl cl h lcrcshn ckqh gz sqwqs guz."
ciphertext += " Gdcl gcrq qhyd sqggqn cl hllcomqk h ljqycacqk nqshgczmldcj ucgd hmzgdqn sqggqn. Jhll: cdhwqancqmkl"
 
# jhll -> pass
ciphertext = ciphertext.upper().replace('J', 'p').replace('H', 'a').replace('L', 's')
 
# Cs -> is
ciphertext = ciphertext.replace('C', 'i')
 
# GDis -> this
ciphertext = ciphertext.replace('G', 't').replace('D', 'h')
print ciphertext
 

NQSatiZMship, Uith

 
ciphertext = "Dc, gdcl cl h lcrcshn ckqh gz sqwqs guz."
ciphertext += " Gdcl gcrq qhyd sqggqn cl hllcomqk h ljqycacqk nqshgczmldcj ucgd hmzgdqn sqggqn. Jhll: cdhwqancqmkl"
 
# jhll -> pass
ciphertext = ciphertext.upper().replace('J', 'p').replace('H', 'a').replace('L', 's')
 
# Cs -> is
ciphertext = ciphertext.replace('C', 'i')
 
# GDis -> this
ciphertext = ciphertext.replace('G', 't').replace('D', 'h')
 
# NQSatiZMship -> relationship, Uith -> with
ciphertext = ciphertext.replace('N', 'r').replace('Q', 'e').replace('S', 'l').replace('Z', 'o').replace('M', 'n').replace('U', 'w')
print ciphertext
 

siRilar, iKea, leWel, eaYh

 
ciphertext = "Dc, gdcl cl h lcrcshn ckqh gz sqwqs guz."
ciphertext += " Gdcl gcrq qhyd sqggqn cl hllcomqk h ljqycacqk nqshgczmldcj ucgd hmzgdqn sqggqn. Jhll: cdhwqancqmkl"
 
# jhll -> pass
ciphertext = ciphertext.upper().replace('J', 'p').replace('H', 'a').replace('L', 's')
 
# Cs -> is
ciphertext = ciphertext.replace('C', 'i')
 
# GDis -> this
ciphertext = ciphertext.replace('G', 't').replace('D', 'h')
 
# NQSatiZMship -> relationship, Uith -> with
ciphertext = ciphertext.replace('N', 'r').replace('Q', 'e').replace('S', 'l').replace('Z', 'o').replace('M', 'n').replace('U', 'w')
 
# siRilar -> similar, iKea -> idea, leWel -> level, eaYh -> each
ciphertext = ciphertext.replace('R', 'm').replace('K', 'd').replace('W', 'v').replace('Y', 'c')
print ciphertext
 

마지막이다. assiOned, A를 바꿔주자.

 
ciphertext = "Dc, gdcl cl h lcrcshn ckqh gz sqwqs guz."
ciphertext += " Gdcl gcrq qhyd sqggqn cl hllcomqk h ljqycacqk nqshgczmldcj ucgd hmzgdqn sqggqn. Jhll: cdhwqancqmkl"
 
# jhll -> pass
ciphertext = ciphertext.upper().replace('J', 'p').replace('H', 'a').replace('L', 's')
 
# Cs -> is
ciphertext = ciphertext.replace('C', 'i')
 
# GDis -> this
ciphertext = ciphertext.replace('G', 't').replace('D', 'h')
 
# NQSatiZMship -> relationship, Uith -> with
ciphertext = ciphertext.replace('N', 'r').replace('Q', 'e').replace('S', 'l').replace('Z', 'o').replace('M', 'n').replace('U', 'w')
 
# siRilar -> similar, iKea -> idea, leWel -> level, eaYh -> each
ciphertext = ciphertext.replace('R', 'm').replace('K', 'd').replace('W', 'v').replace('Y', 'c')
 
# assiOned -> assigned, A -> f
ciphertext = ciphertext.replace('O', 'g').replace('A', 'f')
print ciphertext
 

모든 대문자가 소문자로 바뀌면서, 패스워드를 보여준다.