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kkl | 9 years ago

That is called a "cipher cascade"[1] and practically speaking, no.

[1] https://en.wikipedia.org/wiki/Multiple_encryption

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code_sardaukar|9 years ago

I think you're missing the implication in the original comment, that the NSA has put a backdoor into NIST and the Russian equivalent has put a backdoor into GOST, but neither can use the other's backdoor.

ex3ndr|9 years ago

We have done double encryption based on same ideas.