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4. Encrypt and decrypt some text by executing the following code:
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DECLARE @encrypted varbinary(500)
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DECLARE @decrypted varchar(50)
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SET @encrypted = EncryptByCert(Cert_id('MyCert'),'Text To Encrypt')
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SET @decrypted = DecryptByCert(Cert_id('MyCert'),@encrypted)
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SELECT @encrypted EncryptedText, @decrypted DecryptedText
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Exercise 4: Creating an Asymmetric Key
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In this exercise, you create an asymmetric key that is encrypted using the database master key, and then you use the asymmetric key to encrypt and decrypt data. 1. In SSMS, open a new query window, and change the database context to the AdventureWorks database. 2. Execute the following code:
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CREATE ASYMMETRIC KEY MyAsymmetricKey WITH ALGORITHM = RSA_2048
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3. Verify the creation of the asymmetric key by executing the following code:
SELECT * FROM sys.asymmetric_keys
4. Encrypt and decrypt some text by executing the following code:
DECLARE @encrypted varbinary(500)
DECLARE @decrypted varchar(50)
SET @encrypted = EncryptByAsymKey(AsymKey_ID('MyAsymmetricKey'),'Text To Encrypt') SET @decrypted = DecryptByAsymKey(AsymKey_ID('MyAsymmetricKey'),@encrypted) SELECT @encrypted EncryptedText, @decrypted DecryptedText
6
Designing Database Security
Exercise 5: Creating a DDL Trigger
In this exercise, you create a DDL trigger that prevents any table from being dropped. 1. If necessary, launch SSMS, connect to your instance, open a new query window, and change the context to the AdventureWorks database. 2. Create the DDL trigger by executing the following code:
CREATE TRIGGER tddl_tabledropprevent
ON DATABASE
FOR DROP_TABLE
PRINT 'You are in Production. Tables cannot be dropped!' ROLLBACK ;
3. Create a table for testing purposes, as follows:
CREATE TABLE dbo.DropTest
(ID int NOT NULL);
4. Try to drop the table just created by executing the following code:
DROP TABLE dbo.DropTest;
5. Verify that the table still exists by executing the following code:
SELECT ID from dbo.DropTest
Lesson Summary
DDL triggers fire in response to DDL events that occur on the server, such as cre ating, altering, or dropping an object. The main purpose of DDL triggers is to provide an additional means of security as well as to audit any DDL commands issued against a database.
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 2, Designing Database Security. The questions are also available on the compan ion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
Lesson 2: Designing Database Security
1. A. Datum Corporation needs to audit all schema changes to production data bases. Which feature should be used to accomplish this requirement A. C2 auditing B. DML triggers C. Event notifications D. DDL triggers 2. You need to enable encryption within a database. The application should have the sole authority to encrypt and decrypt data within the tables. The perfor mance of the solution is more important than having very strong encryption. Which solutions meet your requirements (Choose all that apply.) A. Create a certificate and use it to encrypt a symmetric key. Use the symmet ric key to encrypt and decrypt data. B. Create an asymmetric key and use it to encrypt a symmetric key. Use the symmetric key to encrypt and decrypt data. C. Implement an application role for the application and create the encryp tion objects with this role as the owner of the keys. D. Implement a schema for the application and create the encryption objects with this role as the owner of the keys.
6
Designing Database Security
Lesson 3: Securing Database Objects
Databases contain all the code and objects that are required by applications. Each of the objects needs to be properly designed to meet business objectives. Properly designed permissions ensure that applications can access only the objects and data that are allowed. This lesson describes the permission constructs that can be employed to enforce security in a flexible and straightforward manner.
After this lesson, you will be able to:
Design object-level security.
Design a permissions strategy. Analyze existing permissions. Design an execution context. Design column-level encryption.
Estimated lesson time: 30 minutes
Permission Scope
In previous versions of SQL Server, the database defined a huge container of objects, and permissions were then directly granted to objects. SQL Server 2005 defines mul tiple scopes that permissions can be assigned to that will cause DBAs to reevaluate how databases are constructed in the future. Permissions are granted on a securable that can be a database, a schema, or an object. This creates a hierarchical structure of permissions within a database. Granting per missions on a database causes the permissions to be implicitly granted to all schemas. Granting permissions on a schema causes the permissions to be implicitly granted to all objects within a schema. The first layer of security that you will want to plan within a database is a schema. Each schema should represent a functional grouping within an application. Objects are then created within each schema. After objects are created in schemas, permis sions are granted on the schemas to provide security access to an application. For example, if you want to grant SELECT, INSERT, UPDATE, and DELETE permis sions on all tables and views within a database, you can make the assignment three different ways:
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