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第三届上海市大学生网络安全大赛

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发表于 2020-4-2 22:11:18 | 显示全部楼层 |阅读模式
题目名称:classical
题目内容:Download

解题思路:
把cipher.txt的内容使用WinDecrypto进行词频分析
1       -2.3556    In cryptography, a classical cipher is a type of cipher that was used historically but now has fallen, for the most part, into disuse. In contrast to modern cryptographic algorithms, most classical ciphers can be practically computed and solved by hand. However, LyjtL3fvnSRlo2xvKIjrK2ximSHkJ3ZhJ2Hto3x9 they are also usually very simple to break with modern technology. The term includes the simple systems used since Greek and Roman times, the elaborate Renaissance ciphers, World War II cryptography such as the Enigma machine and beyond. A quick brown fox jump over the lazy dog.
把LyjtL3fvnSRlo2xvKIjrK2ximSHkJ3ZhJ2Hto3x9
凯撒移位后
发现
ZmxhZ3tjbGFzc2ljYWxfY2lwaGVyX3NvX2Vhc3l9
可以base64解码得到flag

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