Breaking Ciphers

[Mark Knowles]

Mark,

a simple question: How can you tell if a text is encrypted?

I don't think there can be a universal procedure for determining if a text is encrypted. It almost seems reminiscent of the "halting problem".

Of course we also face the question of what precisely on means by "encryption".

Nevertheless, everything I said in my previous comment does not presuppose the existence a universal technique to determine if a text is encrypted.