CTFlearn - HYPERSTREAM TEST #2

https://beta.ctflearn.com/problems/443

Cryptography

leg3ndaryphil

Tips: Bacon is a kind of encoding method

Useful link:

https://mothereff.in/bacon

CTFlearn - HEXTROADINARY

https://beta.ctflearn.com/problems/158

Cryptography

crypto

Tips: The coder name "ROXy" focus on her name

useful link:
http://xor.pw/#

Remember to include 0x at your answer

CTFlearn - C_E_ER

https://beta.ctflearn.com/problems/304

Cryptography

yakatoi

Tips: C_E_ER means Caesar Cipher 

where key is 13

Useful link

http://md5decrypt.net/en/Caesar/#results

CTFlearn - BASE 2 2 THE 6

https://beta.ctflearn.com/problems/192

Cryptography

pedro

Tips: Base 64 Encoded

Useful link:

https://www.asciitohex.com/

CTFlearn - REVERSE POLARITY

https://beta.ctflearn.com/problems/230

Cryptography

aglickman

Tips: Binary Encoded

Useful link:

https://www.asciitohex.com/

CTFlearn - CHARACTER ENCODING

https://beta.ctflearn.com/problems/115

Cryptography

dknj11902

Tips: Hexadecimal Encode

Useful link:

https://www.asciitohex.com/

CTFlearn - SO MANY 64S

https://beta.ctflearn.com/problems/121

Cryptography

voidmercy

Sample Code:

import base64

with open("flag.txt",encoding = 'utf-8') as f:

ctext=f.read()

while True:
  try:
    ctext=base64.b64decode(ctext)
  except Exception as e:
    print(ctext)
    break

CTFlearn - ENCRYPTION MASTER

https://beta.ctflearn.com/problems/243

Cryptography

skywalkrs

Tips, try the following decode sequence:

1) Base64 

2) Hexadecimal

3) Binary

4) Base64

I_AM_PROUD_OF_YOU

Useful link:

https://www.asciitohex.com/

CTFlearn - BOOK REPORT

https://beta.ctflearn.com/problems/99

Cryptography

natjef20

Python 3x

str=['muffins','safetydance','updateerror','tracebackerror','abcdefghijklmnopqrstuvwxyz','wowneatocool','great','filefolders','goodnessgraious','tombstone','aidanglickman','qwertyuiopasdfghjklzxcvbnm','ABCTFLearn','CornOnTheC*ob*','le14{octobre}','cryptogra\?!FRE"GCN"E','BJblazkowicz','red_HeRRiNGG<>TIME!']

printIndex= [(13,1),(17,3),(14,10),(18,18),(16,13),(15,5),(5,6),(12,8),(8,3),(2,5),(4,10),(11,3),(1,5),(10,1),(7,5),(6,10),(9,4),(3,10),(15,13)]

rtn=['']
for word in str:
  rtn.append(list(word))

result=""
for x,y in printIndex:
  result+=rtn[x][y-1]

print(result)

The result is not AbCEF{filtedittodo}  , there are two spelling mistakes.


Useful link
https://repl.it/ 

CTFlearn - FRIEND JOKE..

https://beta.ctflearn.com/problems/554

Cryptography

kholoud

Tips: BASE64 encoding

d2lzaF95b3VfaGFwcHlfZGF5

Useful Link

https://www.asciitohex.com/

CTFlearn - ANCIENT CIPHER

https://beta.ctflearn.com/problems/550

Cryptography

andreigasparovici

Tips: This is Rail Fence (Zig-Zag) Cipher (3 level)

The rail fence cipher is a form of transposition cipher. It derives its name from the way in which it is encoded

ILYWOYFNYRPOASESOCTSA

Useful link

https://www.dcode.fr/rail-fence-cipher