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First, I would like to point you to this answer. Copying the TL;DR from there: Multiple encryption addresses a problem that mostly doesn't exist. You are better off using a single well chosen algorithm. That said, here are answers to some of your questions: A longer password adds more layers of encryption in this hypothetical scenario and thus ...


KeyCzar is a cryptosystem on its own. It defines a container format, with a header, IV, ciphertext and possibly a (symmetric) signature. The keys it uses are also not just keys, they contain additional information. These "keys" may even contain multiple keys, i.e. an additional one for the signature creation. To decrypt KeyCzar encrypted files you need a ...

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