you_can_t_see_me

you can't see me

General Skills - 200 points

Challenge

'...reading transmission... Y.O.U. .C.A.N.'.T. .S.E.E. .M.E. ...transmission ended...' Maybe something lies in /problems/you-can-t-see-me_0_8fc4b46df0f4dd36b87a28877fcf9ea2.

Solution

An interesting problem.

We notice a file with dot as the name.

$ ls -la
total 60
drwxr-xr-x   2 root       root        4096 Sep 28 08:34 .
-rw-rw-r--   1 hacksports hacksports    57 Sep 28 08:34 .  
drwxr-x--x 576 root       root       53248 Sep 30 03:50 ..

But we can't cat it.

zst123@pico-2018-shell-2:/problems/you-can-t-see-me_0_8fc4b46df0f4dd36b87a28877fcf9ea2$ cat .
cat: .: Is a directory
zst123@pico-2018-shell-2:/problems/you-can-t-see-me_0_8fc4b46df0f4dd36b87a28877fcf9ea2$ cat *
cat: '*': No such file or directory

However notice that there are 2 spaces after the dot

zst123@pico-2018-shell-2:/problems/you-can-t-see-me_0_8fc4b46df0f4dd36b87a28877fcf9ea2$ cat '.  '
picoCTF{j0hn_c3na_paparapaaaaaaa_paparapaaaaaa_e3d80588}