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  1. Hi all, First of all, I apologise if what is required is poorly described, but unfortunately I know very little about networks and their knowledge. But let's get down to facts. In an industrial machine control application, I have inserted a server, a TCP/IP server based on JSON messages, which allows the connection of several clients at the same time and enables motor movement commands to be executed or information to be retrieved from the system. A client programme connects to the server and from then on can do anything with the device it has connected to. At this point, security problems arise, especially for the operator standing at the machine, since a malicious client intruding into the network could trigger dangerous operations for the operator standing near the machine and unaware that someone unauthorised has taken control of it remotely. Now I have been asked to add a security layer, but as a complete ignoramus on the subject, I deal mainly with compilers of languages and UI environments and not with networks, I was wondering how to add a system of certification and authorisation of the client to the server connection. For the client I use python while the server is done with Indy 10 using TIdTCPServer. Thank you in advance for any suggestions and help. Best regards Silverio