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Its working fine, it can encrypt and decrypt. but how strong is it ? is it all depending on the specified key ?
How do i measure the strength of this encryption in bits ?
its basically a matter of the key's length. The bigger it is the more it will produce a big random(well not so random but random) bit stream.... BUT if, as ntubski said, if the key's bit stream used twice... that's not secure neither strong algorithm at all... this app implements the simplest symmetric stream algorithm for educating purposes only... :P