Introduction

Packets that are sent between the client and server are encrypted, Hi-Rez uses Salsa20^[1] which is a rotating key XOR cipher to do that using the Crypto++^[2] C++ library.

The client generates a random KEY/IV^[3][4] pair that it sends to the server using an unencrypted packet when trying to log in.

The KEY/IV is stored in an encrypted binary blob^[5] using the Diffie-Hellman^[6] key exchange in the packet so that the server can initiate its own Salsa20 encryption/decryption.

References

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1. https://en.wikipedia.org/wiki/Salsa20 ↩︎

2. https://www.cryptopp.com/ ↩︎

3. https://en.wikipedia.org/wiki/Key_(cryptography) ↩︎

4. https://en.wikipedia.org/wiki/Initialization_vector ↩︎

5. https://en.wikipedia.org/wiki/Binary_blob ↩︎

6. https://en.wikipedia.org/wiki/Diffie–Hellman_key_exchange ↩︎