update!
if so, the NEW Q will be:
what is the strongest encryption algorithm ? (no time limits)
note that the algorithm can Not make more letters than the input
update! if so, the NEW Q will be: what is the strongest encryption algorithm
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if so, the NEW Q will be:
what is the strongest encryption algorithm ? (no time limits)
note that the algorithm can Not make more letters than the input
http://en.wikipedia.org/wiki/One-time_pad
If your requirements are complete security and not increasing the length of the message at all, then it is possible to do this using a one-time-pad implementation.
Your key material needs to be:
If you are able to do these 4 things, then you can achieve maximum security without increasing your message length.
Your ability to implement this depends on your requirements. At the point you have done 1-4 above, you have not lessened the problem of key exchange (if indeed that is needed).
Read the linked article, and it will explain in good detail.