A daily-challenge script

daily-challenge/README

+Just a CGI script that produces a different challenge every day. The challenge
+is based on the date, but others should not be able to generate them because of
+a salt.
+
+Simply place it somewhere on public web and set the salt (and comment the exit
+1 there).

daily-challenge/challenge.cgi

+#!/bin/sh
+
+set -e
+
+exit 1 # See below
+SALT='<enter-some-salt-here-when-deploying>'
+
+echo 'Content-Type: text/plain; charset=ascii'
+echo ''
+
+(
+	echo "$SALT"
+	date +%d%m%y
+	echo "$SALT"
+) | sha256sum | cut -f1 -d\