题目
It is said that Vigenere cipher does not achieve the perfect secrecy actually :-)
Tips:
1.The encode pragram is given;
2.Do u no index of coincidence ？
3.The key is last 6 words of the plain text(with "nctf{}" when submitted, also without any interpunction)
encode.cpp code.txt
什么是异或
异或（exclusive or）是二元继续阅读 »