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Translation and Shifting (Format encoding) 🥭

Here are some of the most CTF common formats to encode flags with examples:

  • Binary: 01101100 01100101 01110100 01110011 00100000 01110100 01110010 01111001 00100000 01110011 01101111 01101101 01100101 00100000 01100010 01101001 01101110 01100001 01110010 01111001 00100000 01101111 01110101 01110100 00100001 -> lets try some binary out!

  • Base32: MJQXGZJTGIQGS4ZAON2XAZLSEBRW63LNN5XCA2LOEBBVIRRHOM====== -> base32 is super common in CTF's

  • Base64: RWFjaCBCYXNlNjQgZGlnaXQgcmVwcmVzZW50cyBleGFjdGx5IDYgYml0cyBvZiBkYXRhLg== -> Each Base64 digit represents exactly 6 bits of data.

  • Hexadecimal: 68 65 78 61 64 65 63 69 6d 61 6c 20 6f 72 20 62 61 73 65 31 36 3f -> hexadecimal or base16?

  • ROT13: Ebgngr zr 13 cynprf! -> Rotate me 13 places!

  • ROT47: *@F DA:? >6 C:89E C@F?5 323J C:89E C@F?5 Wcf E:>6DX -> you spin me right round baby right round (47 times)

  • Morse: - . .-.. . -.-. --- -- -- ..- -. .. -.-. .- - .. --- -.. -. -.-. --- -.. .. -. --. -> TELECOMMUNICATION ENCODING

  • Decimal: 85 110 112 97 99 107 32 116 104 105 115 32 66 67 68 -> Unpack this BCD

  • Vigenere Cipher: decoder1, decoder2, decoder3

  • More Cipher (rare Caesar): quipqiup (Like Lwuv oguukpi ctqwpf.)

  • If you see something like: 581695969015253365094191591547859387620042736036246486373595515576333693, try the following script:

n = 581695969015253365094191591547859387620042736036246486373595515576333693
h = hex(n)[2:]
print(bytearray.fromhex(h).decode())

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