As my final year project at Campus, am developing a system software in C/C++ to read port data flowing in/out on a network, store it in a file, compress and encrypt it using say transposition method or substitution cryptography and later retransmit it such that it occupies takes less bandwidth than b4.
This is just a prototype to help Companies that operate in low bandwidth environments to help them improve the performance capabilities of their networks.Thats the problem statement.

I can read the data using port functions, but how do i compress it after i've writtten it to the file guys, then retransmit it.Besides the receiver must have a mechanism of decompressing and decrypting the file.

Sounds hard but not so hard i guess!!.