Hybrid RSA and AES Encryption for MetaTrader 5 Trading Communications

Summary

The document explains how an Expert Advisor or indicator can protect communications with a server using hybrid encryption. RSA with PKCS#1 v1.5 padding encrypts a randomly generated AES session key, while AES encrypts the larger request or response payload. The client sends the encrypted key and encrypted data together; the server uses its private RSA key to recover the AES key and then decrypts the payload. The example also describes encoding the transmitted components with Base64.

A pure MQL5 RSA class is included, alongside a basic public-key encryption example and a conceptual request-and-response flow. The document emphasizes keeping the private key on the server. However, it provides no security review or tests, and the class implementation and integration snippets should not be treated as proof of a secure production protocol. In particular, the text does not detail authentication, integrity protection, key validation, or safe random-number generation. These omissions matter when protecting trading commands, credentials, or account data over network connections.

Key ideas

• RSA encrypts a short AES session key, while AES handles the larger message payload.
• The client transmits the encrypted session key alongside the encrypted payload.
• The server needs the matching private RSA key to recover the AES key.
• The examples target MQL5 communications with external servers.
• The document does not establish production security through testing or a security review.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.