contact · duplexsystem

No JavaScript enabled, below is a POSIX shell script you can use to derive my email.

( emulate sh 2>/dev/null
h=10abe018bbe807a7e334aee21baaff1ab3f11db2be17b1fd ck=1b952f40 L=3
ok() { case $1 in 9[7-9]|1[01][0-9]|12[0-2]|4[89]|5[0-7]|64|46|95|43|45) ;; *) return 1;; esac; }
p=0
while [ $p -lt $L ]; do
  s= k=0
  while [ $k -lt 256 ]; do
    d=$h i=0 g=1
    while [ -n "$d" ]; do
      b=$((0x${d%"${d#??}"})) d=${d#??}
      [ $((i%L)) -eq $p ] && { ok $((b^k)) || { g=0; break; }; }
      i=$((i+1))
    done
    [ $g = 1 ] && s="$s $k"
    k=$((k+1))
  done
  case $p in 0) K0=$s;; 1) K1=$s;; *) K2=$s;; esac
  p=$((p+1))
done
for x in $K0; do for y in $K1; do for z in $K2; do
  d=$h i=0 H=$((0x811c9dc5)) o=
  while [ -n "$d" ]; do
    b=$((0x${d%"${d#??}"})) d=${d#??}
    case $((i%L)) in 0) k=$x;; 1) k=$y;; *) k=$z;; esac
    c=$((b^k)) H=$(( ((H^c)*16777619) & 0xFFFFFFFF ))
    o=$o$(printf "\\$(printf %03o $c)") i=$((i+1))
  done
  [ "$(printf %08x $H)" = "$ck" ] && printf '%s\n' "$o"
done; done; done )