asp.net Web Api custom authentication requirement for mobile client

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ASP.NET

REST

Please provide your feedback on my solution against following requirements.

Requirement (similar to):

1.a let say that authentication Token is made out of the Email and date and is encrypted

1.b authentication Token is send back to the client through header

1.c authentication Token is stored on client and server

My solution :

1) To send authentication Token back to the client through header. i have used cookie, and following code.

HttpCookie cookie = new HttpCookie("AuthenticationToken");
      cookie.Value = "EncryptedToken";
      Response.Cookies.Add(cookie);

2) I will store authentication Token in database, and for each request i compare token saved in cookie with token stored in database. (assume that encrypt,decrypt operations are done properly )

Your feedback/commments?