Does anyone know if there is a system program or service available to validate a signature?
If so, where does it store the needed key?
Over an unsecured network data is transfered to our mainframe.
To protoect the data from being spoofed (manipulated) on the way to our mainframe it is signed (using e.g. MD5, AES).
So we'd only except the data, when the provided signature is valid.