Andrew Kraevskii

@andrewkraevskii.me

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8.1.1. The plaintext length side-channel Encryption cannot completely hide the length of plaintext data. We must accept this fact, even if its consequences are unpleasant. Plaintext length can convey a surprising amount of information and have huge impacts to real-world security! An adversary who observes only the length and timing of your encrypted network traffic can figure out: which pages you visited on Wikipedia, or any website with relatively static content of different sizes; which movie you are streaming, because video formats use variable bit-rate (VBR) encodings, so that “busier” segments of the video require more data per second; or even what you are saying in an encrypted audio call! See the chapter notes for references about these attacks. Personally speaking, these are the kinds of attacks that give me the most existential dread about cryptography. However, encryption is about more than just hiding the content of communication, as we will see later in section 9.6.
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An attempt at making Penrose triangle in luminal spaces program
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