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Additional Security Tools. Lesson 15. Skills Matrix. Guarding Your Data. Maintaining data integrity can also involve data encryption and auditing. Encryption.

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Guarding your data
Guarding Your Data

  • Maintaining data integrity can also involve data encryption and auditing.


Encryption
Encryption

  • You can put another layer, encryption, on top of all this security. SQL Server encrypts data with hierarchical encryption and key management infrastructure.

  • Each layer encrypts the layer below it by using a combination of certificates, asymmetric keys, and symmetric keys, in scopes that parallel the permissions hierarchy


Sql server encryption
SQL Server Encryption

  • To encrypt your connections to SQL Server, you first need to get a certificate.

  • You can get one from one of the major vendors such as VeriSign, or you can install Windows Certificate services and supply your own.

  • Once you have a certificate, you need to install it on the server.

  • Finally, you need to configure the clients to request encrypted connections to the server.


Sql server encryption1
SQL Server Encryption

  • The database-level cryptographic features in SQL Server rely on a database master key.

  • This key does not generate automatically when you create the database.

    • It must be created by the system administrator.

  • You need but one master key per database.


Transparent data encryption
Transparent Data Encryption

  • SQL Server 2008 includes a new feature known as Transparent Data Encryption (TDE).

  • This encryption is transparent to the application code as SQL Server 2008 automatically handles the encryption and decryption of all data going in to and out of the database.

  • The primary purpose of this TDE feature is to have the entire database encrypted so that any unauthorized person having direct access to copies of the database files and / or transaction log files cannot decrypt and read the data.


Transparent data encryption1
Transparent Data Encryption

  • It is critically important to understand that the database master key and the encryption certificate need to be backed up to a secure location.

  • This location also needs to be separate from regular backups or other copies of the database files.

  • The encryption security provided by TDE is meaningless if database files and the certificate both fall into the hands of the wrong person.


Extensible key management
Extensible Key Management

  • SQL Server 2008 includes a new feature known as Extensible Key Management (EKM).

  • This is a method of providing for encryption methods using software and possibly hardware such as smart cards or USB devices provided by third-party entities.

  • With EKM, encryption can be established using physical hardware known as a Hardware Security Module (HSM).

  • This can be a more secure solution because the encryption keys do not reside with encrypted data in the database.

  • Instead, the keys are stored on the hardware device.


Audits
Audits

  • Audits keep a record of database activities. Set configuration options for the factors of concern and then review the results.

  • If you suspect someone uses an employee’s login inappropriately, audit for logins and look for suspicious behaviors.


C2 criteria
C2 Criteria

  • In 1985, the Department of Defense published DOD Directive 5200.28-STD, Department of Defense Standard, “Department of Defense Trusted Computer System Evaluation Criteria” known familiarly as the “Orange Book” which was part of the “Rainbow Series” of security evaluation criteria.

  • The Orange Book laid out a matrix where A was the most trusted and D the least trusted.

  • Numbers were also used where 1 was the most stringent criteria.

  • The resultant classes, then, are A1, B1, B2, B3, C1, C2 and D.


C2 criteria1
C2 Criteria

  • C2 requires controlled access protection and is deemed appropriate for “business sensitive” data—less guarded then confidential, secret or top secret classifications.

  • C2 requires individual accountability through login procedures, audit trails, object reuse and resource isolation.

  • SQL Server provides these protections


Auditing
Auditing

  • Auditing an instance of SQL Server or a SQL Server database involves tracking and logging events that occur on the system.

  • SQL Server Utility provides you a means to audit and manage your SQL Server environment as a whole through the concept of application and multiserver management.


Sql server utility
SQL Server Utility

  • SQL Server Utility provides you a means to audit and manage your SQL Server environment as a whole through the concept of application and multiserver management.

  • The SQL Server Utility models your organization’s SQL Server-related entities in a unified view.


Sql server utility architecture
SQL ServerUtility Architecture


Sql server utility1
SQL Server Utility

  • Utility Explorer and SQL Server Utility viewpoints (in SSMS) provide administrators a holistic view of resource health through an instance of SQL Server that serves as a utility control point (UCP).

  • Entities viewable in a SQL Server UCP include instances of SQL Server, data-tier applications, database files and storage volumes. Resource use can be monitored for CPU and storage use.


Summary
Summary

  • SQL Server encryption provides an additional security protection from hackers or eavesdroppers.

  • While someone might access your file stream or table, they will find the information undecipherable.

  • This comes at the expense of additional overhead.


Summary1
Summary

  • With auditing you can create a record of what happens on your SQL Server instance. You can record successful connections to learn who uses what resources how often.

  • A management report might be appropriate to reward diligent employees.

  • With SQL Utility you can monitor the resource health of your entire enterprise and produce near real-time management and analysis reports.


Summary for certification examination
Summary for Certification Examination

  • Know how to configure encryption on a column.

  • Understand transparent data encryption and its value.

  • For a given situation, determine which auditing technique can be of value.


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