A system for out-of-band signaling. This is a technique of communication in which two entities exchange information without transmitting it to each other directly, but using collateral signaling: for example, the number of "artificial" errors, or the length of a packet full of useless data, or even the exact timing of communications.
It is a client-server system, in which clients possess a confidential code (which we will call secret) and want to communicate it to a central server, but without transmitting it. The goal is to make it difficult for those who are capturing data in transit to intercept the secret.
In this project there are C client, S server, and 1 supervisor.
The supervisor is launched first, with an S parameter indicating how many servers we want to activate; the supervisor will then create the S servers (which will have to be separate processes). The C clients, on the other hand, are launched independently, each at different times.
The various parameters are modifiable in the Makefile script.
All the code is POSIX compliance.
To run the code, you have to install:
- gcc
- make
In the file directory, run:
make - to compile all the files
make test - to test the programm on your pc
make clean - to remove compiled and temporary files from the directory