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How to enable SQL encryption in MS SQL server

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In today’s digital landscape, where data breaches and cyber threats loom large, safeguarding sensitive information has become a top priority for organizations across industries. As one of the most widely used database management systems, Microsoft SQL Server holds a trove of valuable data, making it a prime target for malicious actors. To fortify your data fortress and protect against unauthorized access, enabling SQL encryption is not just an option; it’s a necessity.

In this comprehensive guide, we’ll explore the various encryption methods available in MS SQL Server, including Transparent Data Encryption (TDE), Always Encrypted, and SSL encryption for network communication. We’ll delve into the intricacies of each method, providing step-by-step instructions and best practices to help you implement robust security measures and keep your data safe from prying eyes.

Understanding SQL Encryption: A Primer

Before we delve into the specifics of enabling SQL encryption in MS SQL Server, let’s first understand the fundamental concepts behind encryption and its significance in data security.

Encryption is the process of converting plaintext data into ciphertext, making it unreadable to anyone without the appropriate decryption key. This cryptographic technique ensures that even if data falls into the wrong hands, it remains unintelligible and thus protected from unauthorized access.

In the context of SQL Server, encryption plays a vital role in securing data both at rest and in transit. At-rest encryption involves encrypting data stored on disk, including database files, backups, and transaction logs, while in-transit encryption focuses on securing data as it travels between the SQL Server and client applications over a network.

Enabling SQL Encryption in MS SQL Server

1. Transparent Data Encryption (TDE):

Transparent Data Encryption (TDE) is a feature introduced in SQL Server to encrypt the entire database at rest, thereby protecting data files from unauthorized access. Enabling TDE involves the following steps:

  • Create a Database Master Key (DMK): If a DMK doesn’t already exist, create one to secure the certificate used for TDE.
  • Create or Obtain a Certificate: Generate or acquire a certificate to be used for encrypting and decrypting the database.
  • Enable TDE for the Database: Use the ALTER DATABASE statement to enable TDE for the desired database.
  • Back Up the Certificate and the Database Encryption Key: Safeguard the certificate and encryption key by backing them up to a secure location.

2. Always Encrypted:

Always Encrypted is a feature in SQL Server that allows you to encrypt specific columns containing sensitive data, while still allowing the SQL Server to perform operations on the encrypted data. Here’s how to set up Always Encrypted:

  • Generate Column Master Key and Column Encryption Key: Create both keys to enable encryption and decryption of the targeted columns.
  • Define Encrypted Columns: Specify the columns you want to encrypt and designate the encryption type (deterministic or randomized).
  • Update Application to Use Keys: Modify your application to utilize the column master key for encryption and decryption operations.
  • Secure the Keys: Store the column master key and column encryption key in a trusted key store to prevent unauthorized access.

3. SSL Encryption for Network Communication:

SSL encryption is essential for securing data in transit between the SQL Server and client applications. Enabling SSL encryption involves the following steps:

  • Obtain an SSL Certificate: Acquire an SSL certificate from a trusted Certificate Authority (CA).
  • Install the Certificate: Install the SSL certificate on the SQL Server to establish a secure connection.
  • Configure SQL Server for SSL Encryption: Configure SQL Server to force encryption for all connections using the SSL certificate.
  • Ensure Client Application Support: Ensure that client applications support SSL encryption and configure them to trust the server’s SSL certificate.

Best Practices and Considerations

While enabling SQL encryption in MS SQL Server enhances data security, it’s essential to consider best practices and potential challenges:

  • Balance Security and Performance: Evaluate the trade-off between security and performance, as encryption may introduce overhead, particularly in high-volume environments.
  • Comprehensive Security Strategy: Encryption should be part of a broader security strategy that includes access controls, regular audits, and patch management.
  • Data Classification: Prioritize encryption based on the sensitivity of your data and regulatory requirements.
  • Key Management: Implement robust key management practices to safeguard encryption keys and prevent unauthorized access.
  • Regular Updates and Monitoring: Stay proactive by applying security patches and updates regularly and monitoring your SQL Server environment for any anomalies or security threats.


Enabling SQL encryption in MS SQL Server is not just a checkbox on your security checklist; it’s a critical step towards fortifying your data fortress and protecting sensitive information from unauthorized access. By implementing Transparent Data Encryption (TDE), Always Encrypted, and SSL encryption for network communication, you can bolster your database security and mitigate the risk of data breaches.

However, encryption alone is not enough. It should be part of a comprehensive security strategy that encompasses access controls, regular audits, and ongoing monitoring. Stay vigilant, stay proactive, and keep your data safe in an ever-evolving threat landscape.

Remember, the security of your data is paramount, and investing in encryption today can save you from costly data breaches tomorrow. So don’t wait; fortify your data fortress with SQL encryption and safeguard your organization’s most valuable asset—its data