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Using the same Key and IV pair for multiple file encryption is very dangerous because encrypting the two files with the same same content will result the same ciphertext for any block mode encryption. Here are a few related posts about this: Why must IV/key-pairs not be reused in CTR mode? Dangers of using CTR mode for encryption AES-CBC and IV — ...


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I think that having sensitive data (whether it is the password, or derived key, etc) in memory is not something that most systems deal with. That being said, here are several possible mitigation methods for protecting private data in-memory. This could apply to a variety of subjects, Server, Mobile or Desktop. The principals are the same. I'm also not sure ...



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