Hello,I am a computer engineer;
I glad to do your job.
I am an expert in Information Security, Web Security, Network Security, also web programming (PHP, ASP) , Programming (JAVA, jsp, C#, ..), Mobile ( android ,J2ME) , node.js, database(MySQL), web service (soap, web api ), CMS ( WordPress) and Framework ( code igniter and Laravel)...
you will get one time password implementation in c# I had build my own SSO strong authentication which is using time one time password I have the code for c# and java
I will give you the best solution due to my experts in cryptography and security also I teach Information system security
Only chat with me to discuss more details ..
My offer is best to you with my experts and commitment ...
I am very interested in your project and wish to do it ..
Best Regards