Primarily examines the web services concept of the .NET platform having the emphasis on secure communication. A case study demonstrates securing the communication between a web service and its clients through RIJNDAEL, 3DES and RSA algorithms implemented on code based structure which uses the identity token, provided from identity web service, to validate the identity of the client and the status token provided from status web service in order to validate the status of the client. A number of tests are performed using different cryptographic algorithms and network settings for the communication in order to obtain operational values of these algorithms.