Recently Updated
Misaka Mikoto
Challenge
My friends like anime way too much . . . they decided that to give me an encoded message, but I can’t solve it because I’m not a weeb!
contents:
1
rasfsasrettlepinebec353luteayvlrghs3s
Hint: Railguns are cool!
Solution
Rail fence cypher.
Example:
1
2
3
4
5
6
7
WE ARE DISCOVERED. FLEE AT ONCE
W . . . E . . . C . . . R . . . L . . . T . . . E
. E . R . D . S . O . E . E . F . E . A . O . C .
. . A . . . I . . . V . . . D . . . E . . . N . .
WECRL TEERD SOEEF EAOCA IVDEN
Use this to decode our method. We vary the number of rails until we get something sensible
1
2
3
4
5
6
7
8
9
10
11
12
rasfsasrettlepinebec353luteayvlrghs3s
r.......a.......s.......f.......s....
.a.....s.r.....e.t.....t.l.....e.p...
..i...n...e...b...e...c...3...5...3..
...l.u.....t.e.....a.y.....v.l.....r.
....g.......h.......s.......3.......s
railgunsarethebesteasyctfl3f3l5esp3rs
railguns are the best easyctf{l3v3l5esp3rs}
There is also a good online decoder here: http://rumkin.com/tools/cipher/railfence.php
Flag
easyctf{l3v3l5esp3rs}