flip-my-letters-20-points.md

Flip My Letters - 20 points

I dropped my alphabet on its head, can you help me reassemble it?

easyctf{r_wlmg_vevm_mvvw_zm_zhxrr_gzyov}

Solution

The hint suggests that it's a substitution cipher, where the key is the alphabet in reverse. It is easy to test the idea using the tr Unix command. Sure enough, it works.

$ echo "r_wlmg_vevm_mvvw_zm_zhxrr_gzyov" | tr abcdefghijklmnopqrstuvwxyz zyxwvutsrqponmlkjihgfedcba
i_dont_even_need_an_ascii_table

Flag:

easyctf{i_dont_even_need_an_ascii_table}

External Writeups