In this article you will learn how to use SQLite. NET in Xamarin. Forms. In this article I am going to show how to use Authorization and Authentication using a WCF service in Enterprise Architecting standards. This article is of Advanced. Cloud Solutions from AccountantsWorld offer more effective ways for you to manage your practice, perform your client engagements, and offer new services. A security token sometimes called an authentication token is a small hardware device that the owner carries to authorize access to a network service. You are doing some kind of check against a database for a username and password, thats more of a forms based authentication. The purpose of Windows authentication is. Even if the key fob falls into the wrong hands, however, it cant be used to gain access because the PIN which only the rightful user knows is also needed. MVC6 Decrypting a forms authentication cookie from another website. I have a webforms website that is calling into a new MVC6 website that we are working on. The user will login as they always have done on the webforms website using forms authentication and then get redirected to the new MVC6 website. I know in MVC6 that I should be using Cookie Authentication but cannot get it to decrypt the cookie. I suspect its down to changes around web. Here is what I have done. I have set up cookie authentication as follows app. Use. Cookie. Authenticationoptions. Cookie. Name My. Webforms. Cookie. Automatic. Authenticate true. Authentication. Scheme Cookies. Ticket. Data. Format new My. Secure. Data. Format. Data. Protection. Provider new My. Data. Protection. Provider. Cookie. Domain localhost. The class is as followspublic class My. Secure. Data. Format ISecure. Data. Formatlt Authentication. Ticket. public string ProtectAuthentication. Ticket data. return string. Empty. public string ProtectAuthentication. Ticket data, string purpose. Empty. public Authentication. Ticket Unprotectstring protected. Text. return null. Authentication. Ticket Unprotectstring protected. Text, string purpose. Forms. Authentication. Decryptprotected. Text. return null. The cookie is being read, and the Unprotect method called, but then it errors on the Forms. Authentication. Decrypt method with error. An exception of type System. Web. Http. Exception occurred in System. Web. dll but was not handled in user code. Additional information Unable to validate data. Stack at. System. Web. Configuration. Machine. Key. Section. Encrypt. Or. Decrypt. DataBoolean. f. Encrypt, Byte buf, Byte modifier, Int. Int. 32 length. Boolean use. Validation. Sym. Algo, Boolean use. Legacy. Mode, IVType iv. Type. Boolean sign. Data at. System. Web. Security. Forms. Authentication. DecryptString. Ticket at. Web. Application. Mvc. My. Secure. Data. Format. UnprotectString protected. Text. String purpose in. C SVNCodeGlobal. Connect. V2Web. Application. MvcStartup. cs line 1. Microsoft. Asp. Net. Authentication. Cookies. Cookie. Authentication. Handler. d9. Move. NextSo this leads me to believe that its not reading machine key. I have this in the web. Server. lt system. Server. lt system. Key compatibility. ModeFramework. 20. SP2 validationSHA1 decryptionAES validation. Keymykey decryption. Keydec. lt system. This works on earlier MVC apps but guessing something changed in MVC6. I have also tried the following but no luck services. Configure. Data. Protectionconfigure. Use. Cryptographic. Algorithmsnew Microsoft. Asp. Net. Data. Protection. Authenticated. Encryption. Authenticated. Encryption. Options. Encryption. Algorithm Microsoft. Asp. Net. Data. Protection. Authenticated. Encryption. Encryption. Algorithm. AES2. 56CBC. Validation. Algorithm Microsoft. Asp. Net. Data. Protection. Authenticated. Encryption. Validation. Algorithm.