How to decrypt using MD5Crypto

How can I decrypt a string which uses the folowing code to encrypt a string :

public static string HashResetParams(string username, string guid)
        {
            byte[] bytesofLink = System.Text.Encoding.UTF8.GetBytes(username + guid);
            System.Security.Cryptography.MD5 md5 = new  System.Security.Cryptography.MD5CryptoServiceProvider();
            string HashParams = BitConverter.ToString(md5.ComputeHash(bytesofLink));
            return HashParams;
        }
LVL 2
brgdotnetcontractorAsked:
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Rikin ShahMicrosoft Dynamics CRM ConsultantCommented:
Well, you are on the right track... MD5 is your choice.

Yes Guids are... but for your extra mile you can encrypt it. And when you want to compare the Guids entered by the user while the redirection, the user entered Guid will be encrypted and compared to the encrypted one in the database.

Or you can send the encrypted Guid string right away to the user and ask the user to enter it while confirming the registration. In this case you will not have to encrypt the Guid to compare against the encrypted string in the database.
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Rikin ShahMicrosoft Dynamics CRM ConsultantCommented:
Hi,

You want to decrypt MD5 encrypted string which is not possible. MD5 is a non decrypt-able cryptography type.

There are some websites which runs on database for some standard passwords people use to keep (like, 123456, abc123). In that case it can be useful to you to decrypt. In case your password is not simple (like, askjdh122?) the website would not be useful.
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brgdotnetcontractorAuthor Commented:
When a user registers to my site for the first time, I send them an email message with a unique guid. Then when they click on a link in the email message, they are redirected back to a web page which ask them to confirm their identity. The guid is stored in the query string, where I check it, against it's previously saved value in the database.

So is it senseless for me to encrypt the guid? Guids are fairly cryptic as is? Just thought I would go the extra mile to convulute the password further so no hacker could access it.

What encryption should I use, if encrypting it does make sense?
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