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No, I'm not misapplying DK

> Does an extra layer of bad crypto diminish the effectiveness of the good crypto?

Yes, you can find other children comment with specific examples.

> It doesn't seem like it would

More DK: you don't know enough to evaluate how much you know.



So rot13 will render my aes useless?


Possibly. If your rot13 takes longer to rotate a Z than it does and A, then it will leak your Zs through the AES. Similarly, you might accidentally write your own rot13 heartbleed.


So you just need to add an extra layer on another computer surely, or else I could MITM SSL by encrypting/unencrypting it


It might weaken it, yes.




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