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It's still just a substitution cipher. The fact that it maps to a (somewhat) different alphabet doesn't change that. You could still perform frequency analysis to retrieve the plaintext. Of course you'd have a rather large (26 character) key if the attacker doesn't find out that you're using the QUERTY keyboard layout. But a bit of puzzling would be enough ...


If the substitution ciphers belong to the same family, then their composition will also (typically, assuming that the family is closed under composition) belong to the same family. Thus, breaking the combined cipher will be no harder than breaking an arbitrary cipher in the family. For a simple example, combining two Caesar shift ciphers with shifts ...


The composition of any number of substitution ciphers is still a substitution cipher, hence no.

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