placeholder for security measures

diff --git a/Demo/pdist/security.py b/Demo/pdist/security.py
new file mode 100755 (executable)
index 0000000..29bc945
--- /dev/null
+++ b/Demo/pdist/security.py
@@ -0,0 +1,26 @@
+class Security:
+
+       def __init__(self):
+               import os
+               env = os.environ
+               if env.has_key('PYTHON_KEYFILE'):
+                       keyfile = env['PYTHON_KEYFILE']
+               elif env.has_key('HOME'):
+                       keyfile = env['HOME'] + '.python_keyfile'
+               else:
+                       keyfile = '.python_keyfile'
+               try:
+                       self._key = eval(open(keyfile).readline())
+               except IOError:
+                       raise IOError, "python keyfile %s not found" % keyfile
+
+       def _generate_challenge(self):
+               import whrandom
+               return whrandom.randint(100, 100000)
+
+       def _compare_challenge_response(self, challenge, response):
+               return self._encode_challenge(challenge) == response
+
+       def _encode_challenge(self, challenge):
+               p, m = self._key
+               return pow(challenge, p, m)