Hello. Can you provide more details please?
Do you need software written - or just a shell script? Something else?
I have worked with MP3 streams on Linux before - using the mpg123 library for decoding and libcurl for the network functionality. I am certainly not an expert on cryptography, but dare say I know as much as the other bidders here about AES-128 encryption. In any case, it may be possible to use the OpenSSL library to handle decryption if necessary.
PLEASE NOTE: This bid is PROVISIONAL until I receive further details: I may need to revise the price and / or timeframe based on the details you provide.
I am based in Ireland - so a few hours ahead of Canada.