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Updating database asp

The Windows operating system comes pre-loaded with a list of trusted certificate authorities (CAs). We will examine how certificates can be created using SQL Server 2005 along with how to use their public key to encrypt and its private key to decrypt.

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To digitally sign the data, we use the function, passing the identifier for the asymmetric key, the data to be signed, and the password which we used to encrypt the private key.In this article - the final one of the series - starts with a look at the T-SQL commands for performing asymmetric encryption and decryption.Next, we discuss using digital signatures as a means for ensuring the integrity of the encrypted data. NET 2.0 website example that ties together the lessons learned throughout this article series. NET application stores customer information with the customer's credit card information encrypted. NET page provides a means to view the sensitive information in plaintext as well as a means to add new customers to the database with the credit card information properly encrypted. In Using Symmetric Encryption in a SQL Server 2005 Database we looked at the T-SQL support for symmetric encryption.This article is the third and final piece of a three-part series exploring cryptographic systems and encrypting data within a Microsoft SQL Server 2005 database.It explores techniques for encrypting data in a Microsoft SQL Server 2005 database using asymmetric encryption.Unfortunately, as one might guess from the previous sections, SQL Server Management Studio is lacking when it comes to wizard-based creation of keys and certificates.

Therefore, it is impossible for a developer to completely rid him or herself from writing a little T-SQL.

If the data has not been changed since its signing, the function will output the value 1, otherwise 0. Next, we update the plaintext by appending an extra "0" to the string, thereby modifying the data.

We again check the integrity of the data using the function.

This time the function outputs 0, indicating that the signature is no longer valid and, therefore, that the data has been changed.

Note that in a real world application we would more than likely encrypt the plaintext first (not store it directly), and then sign the encrypted ciphertext.

Open a New Query and execute the following script to create the necessary database master key, the certificate, and the symmetric key.