I'm planning to fix this asap, but I want to add a small program to the book to test strfry with input, like './test blah'. This would test both strfry and arc4random at the same time.
From what I see of strfry's behavior, the length never changes, and the new string uses characters from the old, however the new string may use duplicate characters if random chance makes it happen. Like "abcd" can become "ccac". It's certainly usefull to preserve this behavior. There should be no future problems with the new patch. I doubt strfry is, or ever will be, intended for security applications, but in spite of this it's still best to use erandom or urandom for entropy. robert
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