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What are the practices to generate encryption key securely? If you want best security you have to use smartcards or HSMs with a true random number generator (TRNG). However those tend to be expensive (especially good HSMs) so I'll summarize the three main ways to generate symmetric encryption keys. Key Exchange Using the (elliptic curve) ...


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A while ago, I spent time playing with modern field/pen & paper ciphers, especially with Card-Chameleon. Card-Chameleon needs two separate full alphabet permutations as a key. As it's a field/pen & paper cipher, I tried to find a computer-less, math-less, way to generate these permutations from passwords. My solution is a two steps process. Let's ...


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Is it fair to say a PBKDF is a specialization of KDF? Sure. A PBKDF is a KDF, just one that uses a password/passphrase as the entropy source. OTOH, a KBKDF (key-based KDF, if you want to call it that) is also a specialization of a KDF. A different specialization, which is why it may not be a good idea to treat them as a single thing. Will ...



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