AIS3 2015 Writeup: crypto1

Reference:

Keynote:

  • filename

Reference:

  • https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

Tools:

  • Vigenere Cipher Decoder http://www.dcode.fr/vigenere-cipher
  • Vigenère Cipher Codebreaker http://www.mygeocachingprofile.com/codebreaker.vigenerecipher.aspx

藉由第一個連結找出可能的 key length，再由第二個連結，設定 key size 後找出所有的可能，並搜尋 “the key is” 找出可辨識的字串

vigenere_key_length_in_ais3's_crypto_question

vigenere_decode_in_ais3's_crypto_question

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