Encryptor:

#!/usr/bin/ruby

flag= ???
str = "0123456789abcdef"
chr = "!\"#%&()+,-./0123456789:<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[^_`abcdefghijklmnopqrstuvwxyz~"
bin = "0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111"
flags = flag.scan /\w/
hh=flags.map{|h| h.unpack('H*')}.join()
a=hh.scan /\w/
b=a.map{|x|str[bin.index(bin[str.index(x)*5,4].reverse)/5,1]}.join
c=[]
for y in 0..(b.length/2)
    c.push(b[y*2,2].hex.chr.encode('utf-8','iso-8859-1'))
end
i=chr.length-1
d=c[0,c.length-1].join()
f=[]
e=d.split("").each do |z|
    f.push(chr[rand(0..i),1] + z + chr[rand(0..i),1])
    end
p f.join()