Password protected site

for lines in file( 'passwd.txt' ):

        ( User, Pass ) =  lines.strip( ).split( ':' )

        if(( id == User ) and ( passwd == Pass )):
                        print "Correct, You may pass"
        else:
                        print "Intruder Alert"

matched = False
# assuming id is already set to the username and passwd to the password (both to be
# checked against the file listing)
for line in file('passwd.txt'):
    user, pass = line.strip().split(':')
    if (user == id) and (pass == passwd):
        matched = True
        break

if matched:
    print "Success"
else:
    print "Failure"