I tried that too. It's the same thing happening.
PHP Code:
Encode or Decode? (e/d)
e
Enter four digit number: 4526
Encrypted number is: 9312
Continue? (y/n) 
y
Encode or Decode? (e/d)

Continue? (y/n)  
y
Please remember to secure your password before exiting.
Press any key to continue... 
What am I missing?

Thanks,

Matt