题目

打开得到一副adfgvx加密棋盘
观察txt数据只有1-5，猜测是数字字母坐标转换，用notepad批量操作一下

解题

AGAXXDAGGVGGVDVADAVXDGADVGDVAADDDDFXAFAFDGDVXXDGGDGGDXDDFDDXVGXADGVDFXVVAADDXDXXADDVGGGXGXXXXGXXGGXGDVVVGGGAGAAAAGAAGGAGDDDAGAGGGAGGAGAGAAAVAAAXGXGGGXGGXGXGXXXV

┌──(holyeyes㉿kali2023)-[~/Misc/tool-misc/zsteg]
└─$ zsteg board.png 
b1,r,lsb,xy         .. text: "0W9`u}Xy;OM?"
b1,rgb,lsb,xy       .. text: "JRQXG5CLMV4XWWLVONQXS6LEON6Q====\r\n"
b3,g,lsb,xy         .. file: very old 16-bit-int big-endian archive
b4,abgr,msb,xy      .. file: RDI Acoustic Doppler Current Profiler (ADCP)

LastKey{Yusayyds}
AGAXXDAGGVGGVDVADAVXDGADVGDVAADDDDFXAFAFDGDVXXDGGDGGDXDDFDDXVGXADGVDFXVVAADDXDXXADDVGGGXGXXXXGXXGGXGDVVVGGGAGAAAAGAAGGAGDDDAGAGGGAGGAGAGAAAVAAAXGXGGGXGGXGXGXXXV

4441534354467b64383539633431633533306166633163316164393461626439326634626166387d

DASCTF{d859c41c530afc1c1ad94abd92f4baf8}