How to Separate your Cryptographic Keys

By Crypto Quantique

February 14, 2023

When designing cryptographic protocols and systems, many guiding principles ought to be respected. Often, these guiding principles are lessons learned from years of attacks and vulnerabilities against supposedly secure systems. Today we will look at one of the most prominent principles in cryptographic design – the principle of key separation. While the ideas behind key separation seem straightforward, we will see that it is not always trivial to spot cases of poorly implemented key separation. To show this, we will look at the example of the recent attacks on the MEGA cloud storage platform that leverage poor key separation to achieve a full breach of security.

What is key separation?

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