Instructions:Enter a plaintext sentence in the textfield
labeled "Message:" then hit return. A random key is generated and
shown in the textfield labeled "Key:". Then all possible keys are
applied to the ciphertext created by xor-encrypting the message with
the key. The results are shown in the textarea below the message. It
is fairly easy to tell by looking at the output what the original key
is. Can the simple xor cipher be modified to make it harder to attack?