• Chars
  • Points: 100
  • Type: Crypto
  • Solves: 175
  • Download

Can you find then flag inside this matrix ?
ダウンロードしたファイルを解凍するとflag.txtができます。次のようなテキストデータです。
cRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RmRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRFRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRkRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRXRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRJRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRR7RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRYRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRR2RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRhRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRhRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRcRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRlRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRR9RRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRhRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRZRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRnRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRlRRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRcRRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRlRRRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRR9RRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRjRRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRaRRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRGRRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRFRRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRyRRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRXRRRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRR2RRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRdRRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRpRRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRdRRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRmRRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRVRRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRfRRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRZRRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRmRRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRxRRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRhRRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRZRR
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR3R
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR0
左上から斜め方向に文字を抽出すると次のような文字列になります。
cmFkYXJ7Y2hhcl9hZnRlcl9jaGFyX2dpdmVfZmxhZ30
これをBASE64でデコードするとフラグになります。
フラグは、
radar{char_after_char_give_flag}