Changes for page sql-tde

Last modified by Nikhil Singh on 2026/07/03 08:32
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From version < 3.2 >
edited by Nikhil Singh
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1 -= TDE(1) =
1 += **1. Steps for Implementing Transparent Data Encryption (TDE) FROM SQL Server** =
2 2  
3 -1 CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'YourStrongPasswordHere!';
4 -GO
5 5  
6 -CREATE CERTIFICATE TDE_Certificate
7 -WITH SUBJECT = 'TDE Certificate';
8 -GO
4 +This document outlines the process of **encrypting SQL Server databases** using **Transparent Data Encryption (TDE)** and backing them up to **Azure Storage**. TDE ensures data at rest is encrypted, leveraging a **Master Key (MK)**, **TDE Certificate**, and **Database Encryption Key (DEK)** for encryption.
9 9  
10 -2 USE master;
11 -GO
6 +The process also includes creating a **credential** for secure backup to **Azure Blob Storage**, providing a scalable and secure solution for storing encrypted databases in the cloud.
12 12  
13 -SELECT
14 - cert.name AS Certificate_Name,
15 - cert.subject AS Certificate_Subject,
16 - cert.issuer_name AS Issuer_Name,
17 - cert.pvt_key_encryption_type AS Private_Key_Encryption_Type
18 -FROM
19 - sys.certificates cert
20 -WHERE
21 - cert.name LIKE 'TDE%';
22 22  
9 +[[image:image-20250305152543-1.png]]
23 23  
24 -3 BACKUP CERTIFICATE TDE_Certificate
25 -TO FILE = https://zagpebslab.blob.core.windows.net/sql-backups?sp=racwl&st=2025-02-25T13:28:42Z&se=2026-02-25T21:28:42Z&spr=https&sv=2022-11-02&sr=c&sig=eQKxB%2F0bg5cX71PmhUTlGHLCnIwSbe5CLOWVVkaDR1g%3D\TDE_Certificate.cer'
26 -WITH PRIVATE KEY (
27 - FILE = https://zagpebslab.blob.core.windows.net/sql-backups?sp=racwl&st=2025-02-25T13:28:42Z&se=2026-02-25T21:28:42Z&spr=https&sv=2022-11-02&sr=c&sig=eQKxB%2F0bg5cX71PmhUTlGHLCnIwSbe5CLOWVVkaDR1g%3D\TDE_PrivateKey.pvk',
28 - ENCRYPTION BY PASSWORD = 'AnotherStrongPasswordHere!'
29 -);
30 -GO
31 31  
12 +**~1. Create a Master Key in the master Database**
13 +The first step is to create a **Master Key** in the master database. This key will be used to encrypt other cryptographic objects, such as certificates and symmetric keys, within SQL Server.
32 32  
33 -USE Normal;
34 -GO
35 35  
36 --- 6. Create a Database Encryption Key (DEK) and encrypt it with the TDE certificate
37 -CREATE DATABASE ENCRYPTION KEY
38 -WITH ALGORITHM = AES_256
39 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
40 -GO
16 +**2. Create a TDE Certificate (Encrypted by the Master Key)**
17 +Next, generate a **TDE certificate** that will be used to encrypt the **Database Encryption Key (DEK)**. This certificate is encrypted by the **Master Key** created in step 1, providing an additional layer of security.
41 41  
42 -USE [dba]
43 -GO
44 44  
45 -CREATE DATABASE ENCRYPTION KEY
46 -WITH ALGORITHM = AES_256
47 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
48 -GO
20 +**3. Choose the Database to Create the Database Encryption Key (DEK)**
21 +For the selected database, create the **Database Encryption Key (DEK)**. The DEK will be encrypted by the **TDE certificate** and will use the **AES-256 encryption algorithm** to ensure data is securely encrypted at rest.
49 49  
50 50  
51 -USE [dba1]
52 -GO
24 +**4. Enable Encryption for the Database**
25 +Once the **DEK** has been created, enable **TDE** for the database. This ensures that all data written to the database is automatically encrypted at rest, providing full protection for sensitive information.
53 53  
54 -CREATE DATABASE ENCRYPTION KEY
55 -WITH ALGORITHM = AES_256
56 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
57 -GO
58 58  
28 +**5. Create a Credential with a SAS Token**
29 +Finally, create a **credential** that allows SQL Server to access Azure Blob Storage. This credential is created using a **Shared Access Signature (SAS) token**, which ensures secure and authenticated access to the storage account for backup purposes.
59 59  
60 -USE [dba2]
31 +{{code language="sql"}}
32 +drop credential [https://zagpebslab.blob.core.windows.net/sql-backups]
33 +CREATE CREDENTIAL [https://zagpebslab.blob.core.windows.net/sql-backups]
34 +WITH IDENTITY='SHARED ACCESS SIGNATURE'
35 +, SECRET = 'sp=racwdli&st=2025-02-25T13:28:42Z&se=2026-02-25T21:28:42Z&spr=https&sv=2022-11-02&sr=c&sig=kBFwlj5S5eqBEE32LM1EFebBY0W94uEFiwOXo3R0yt4%3D'
61 61  GO
37 +
38 +{{/code}}
62 62  
63 -CREATE DATABASE ENCRYPTION KEY
64 -WITH ALGORITHM = AES_256
65 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
66 -GO
67 67  
41 +**~ 6. Use a Stored Procedure to Back Up to Azure Storage Account**
68 68  
69 -USE [dba3]
70 -GO
43 +{{code language="sql"}}
44 +EXECUTE dba.dbo.DatabaseBackup
45 +@Databases = 'dba',
46 +@URL = 'https://zagpebslab.blob.core.windows.net/sql-backups',
47 +@BackupType = 'Full',
48 +@CopyOnly = 'Y',
49 +@Compress = 'Y',
50 +@Verify = 'N'
51 +{{/code}}
71 71  
72 -CREATE DATABASE ENCRYPTION KEY
73 -WITH ALGORITHM = AES_256
74 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
75 -GO
53 +=== ===
76 76  
77 -USE [xwiki]
78 -GO
55 +=== Conclusion: Backup to Azure Storage Account with TDE Encrypted Databases ===
79 79  
80 -CREATE DATABASE ENCRYPTION KEY
81 -WITH ALGORITHM = AES_256
82 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
83 -GO
57 +The attempt to back up an **encrypted database** (with Transparent Data Encryption - TDE) from **SQL Server Management Studio (SSMS)** to an Azure Storage Account was unsuccessful. This issue arises because **Azure does not permit TDE-encrypted databases to be backed up directly to Azure Storage using SSMS**.
84 84  
59 +However, after decrypting the database, we were able to successfully back it up to the Azure Storage Account via SSMS. This confirms that **backups can be performed on an unencrypted database**, but **not on an encrypted database**.
85 85  
86 --- 7. Enable Transparent Data Encryption (TDE) on the database
87 -ALTER DATABASE dba
88 -SET ENCRYPTION ON;
89 -GO
90 90  
91 91  
92 -select name, database_id, state_desc
93 -from sys.databases
94 94  
95 95  
96 -SELECT
97 - database_id,
98 - key_algorithm,
99 - key_length,
100 - encryption_state_desc
101 - encryptor_type
65 += **2. Enabling Transparent Data Encryption (TDE) Using Azure Key Vault** =
102 102  
103 -FROM
104 - sys.dm_database_encryption_keys;
105 105  
68 +**Introduction:** This document outlines the process of enabling **Transparent Data Encryption (TDE)** on an **Azure SQL Managed Instance (SQL MI)** using a **Customer-Managed Key (CMK)** stored in **Azure Key Vault**. The encryption is managed using an asymmetric key from **Azure Key Vault**, ensuring that all data within the SQL Managed Instance is encrypted using a strong encryption algorithm.
106 106  
107 - Select * from sys.dm_database_encryption_keys
108 108  
71 +===== **1. Generate a Key in Azure Key Vault** =====
109 109  
110 - BACKUP DATABASE [dba2]
111 -TO URL = 'https://zagpebslab.blob.core.windows.net/sql-backups?sp=racwl&st=2025-02-25T13:28:42Z&se=2026-02-25T21:28:42Z&spr=https&sv=2022-11-02&sr=c&sig=eQKxB%2F0bg5cX71PmhUTlGHLCnIwSbe5CLOWVVkaDR1g%3D'
112 -With copy_only
113 -GO
114 114  
74 +**- Navigate to Azure Key Vault:**
115 115  
116 -BACKUP DATABASE [dba2]
117 -TO URL = 'https://zagpebslab.blob.core.windows.net/sql-backups?sp=racwl&st=2025-02-25T13:28:42Z&se=2026-02-25T21:28:42Z&spr=https&sv=2022-11-02&sr=c&sig=eQKxB%2F0bg5cX71PmhUTlGHLCnIwSbe5CLOWVVkaDR1g%3D',
118 -
119 - COPY_ONLY, -- Ensures the backup does not affect the regular backup chain
120 - COMPRESSION, -- Optional: Compresses the backup to save storage space
121 - STATS = 10 -- Optional: Provides backup progress status
122 -GO
76 +* Go to the **Azure Portal** and select **Key Vault** (DemoRudiTest).
123 123  
78 +**- Generate a New Key:**
124 124  
80 +* Go to the **Keys** section and click **Generate** to create a new key.
125 125  
126 --- Step 1: Drop the existing credential (if needed)
127 -DROP CREDENTIAL [https://zagpebslab.blob.core.windows.net/sql-backups];
128 -GO
82 +**- Configure Key Settings:**
129 129  
130 --- Step 2: Create a new credential with the SAS token
131 -CREATE CREDENTIAL [https://zagpebslab.blob.core.windows.net/sql-backups]
132 -WITH IDENTITY = 'SHARED ACCESS SIGNATURE',
133 -SECRET = 'sp=racwdli&st=2025-02-25T13:28:42Z&se=2026-02-25T21:28:42Z&spr=https&sv=2022-11-02&sr=c&sig=kBFwlj5S5eqBEE32LM1EFebBY0W94uEFiwOXo3R0yt4%3D';
134 -GO
84 +* **Name the Key**: Choose a name for your key, e.g., mysqlmikey.
85 +* **Key Type**: Select **RSA** as the key type.
86 +* **RSA Key Size**: Choose an **RSA key size** of **2048-bit**. (optional)
135 135  
136 --- Step 3: Perform the database backup with the provided parameters
137 -EXECUTE dba.dbo.DatabaseBackup
138 - @Databases = 'dba', -- Replace with your database name
139 - @URL = 'https://zagpebslab.blob.core.windows.net/sql-backups', -- Azure Blob Storage URL
140 - @BackupType = 'Full', -- Full backup
141 - @CopyOnly = 'Y', -- Copy-only backup to avoid breaking backup chain
142 - @Compress = 'Y', -- Compress the backup
143 - @Verify = 'N'; -- No verification of backup
144 -GO
88 + Note:
145 145  
90 +* switching from 2048-bit RSA to 4096-bit RSA for TDE will affect performance, but the actual impact might be minor, especially on modern hardware and typical workloads.
91 +* **It will likely affect CPU usage** more than disk I/O, and the impact might be more noticeable during key management operations (key generation, encryption, etc.).
92 +* If your database is not under heavy load and your hardware can handle the extra processing, the trade-off for better security may be worth it.
146 146  
94 +**- Create the Key:**
147 147  
96 +* Click **Create** to generate the key.
148 148  
98 +===== **2. Enable TDE on the SQL Managed Instance** =====
149 149  
150 -select name, database_id, state_desc
151 -from sys.databases
100 +===== =====
152 152  
102 +**- Navigate to Your Managed Instance:**
153 153  
154 -SELECT
155 - database_id,
156 - key_algorithm,
157 - key_length,
158 - encryption_state_desc
159 - encryptor_type
104 +* Go to your **SQL Managed Instance** (sqlmi-ebs-lab).
160 160  
161 -FROM
162 - select * from sys.dm_database_encryption_keys;
106 +**- Enable Transparent Data Encryption (TDE):**
163 163  
108 +* Under **Security**, select **Transparent Data Encryption**.
164 164  
165 - select name, is_encrypted from sys.databases
110 +**- Configure TDE with a Customer-Managed Key (CMK):**
166 166  
112 +* Select **Customer-managed key** as the encryption type.
113 +* Choose the key you created earlier from **Azure Key Vault** (mysqlmikey).
167 167  
168 - SELECT
169 - cert.name AS Certificate_Name,
170 - cert.subject AS Certificate_Subject,
171 - cert.issuer_name AS Issuer_Name,
172 - cert.pvt_key_encryption_type AS Private_Key_Encryption_Type
173 -FROM
174 - sys.certificates cert
175 -WHERE
176 - cert.name LIKE 'TDE%';
115 +**- Set the Key as Default TDE Protector:**
177 177  
178 - ALTER DATABASE dba1
179 -SET ENCRYPTION off;
180 -GO
117 +* Make the key the **default TDE protector** for your instance.
181 181  
119 +**- Save Configuration:**
182 182  
183 -Use dba1;
184 -DROP DATABASE ENCRYPTION KEY;
121 +* Click **Save** to apply the changes.
185 185  
123 +=== **Conclusion** ===
186 186  
187 -USE [dba1]
188 -GO
125 +After following these steps, **TDE** has been successfully enabled on your **SQL Managed Instance** using an **asymmetric key** stored in **Azure Key Vault**. All databases within the instance are now encrypted using the same encryption key (identified by the same encryption thumbprint). You can now securely back up these encrypted databases from **SSMS** to **Azure Storage**.
189 189  
190 -CREATE DATABASE ENCRYPTION KEY
191 -WITH ALGORITHM = AES_256
192 -ENCRYPTION BY SERVER CERTIFICATE TDE_Certificate;
193 -GO
127 +This process ensures that your data is protected both at rest and during backup, offering enhanced security for your managed databases in the cloud.
194 194  
195 195  
196 196  
197 -ALTER DATABASE dba1
198 -SET ENCRYPTION ON
131 +=== **1. Backup Specific Databases Using SQL Server Agent Jobs** ===
199 199  
133 +This document describes the process of creating an automated **SQL Server Agent Job** to back up only the **DBA databases** in a SQL Server instance. The backups will occur **daily at 3:00 AM** and will be stored in an **Azure Storage Account** for secure and reliable cloud storage.
200 200  
135 +----
201 201  
137 +==== **1. Create the Backup Script** ====
202 202  
203 203  
140 +====== **- Declaring Variables** ======
204 204  
142 +{{code language="sql"}}
143 +DECLARE @DatabaseName NVARCHAR(128)
144 +DECLARE @BackupContainerURL NVARCHAR(512)
145 +{{/code}}
205 205  
147 +DECLARE @DatabaseName NVARCHAR(128) DECLARE @BackupContainerURL NVARCHAR(512)
206 206  
149 +* **@DatabaseName**: A variable to hold the name of the database during each iteration of the loop.
150 +* **@BackupContainerURL**: A variable to store the URL of the Azure Blob Storage container where the database backups will be stored.
207 207  
152 +----
208 208  
154 +====== **2. Setting the Azure Blob Storage URL** ======
209 209  
156 +{{code language="sql"}}
157 +SET @BackupContainerURL = 'https://<your_storage_account>.blob.core.windows.net/sql-backups/'
158 +{{/code}}
210 210  
211 211  
161 +----
212 212  
163 +====== **3. Declaring the Cursor** ======
213 213  
214 214  
166 +{{code language="sql"}}
167 +DECLARE db_cursor CURSOR FOR
168 +SELECT name
169 +FROM sys.databases
170 +WHERE name LIKE 'dba%' -- Only pick databases that start with 'dba'
171 +{{/code}}
215 215  
173 +* **Cursor Declaration**:
174 +** The cursor db_cursor is declared to loop through the list of databases in the sys.databases system view.
175 +** The **WHERE name LIKE 'dba%'** clause ensures that only databases with names starting with dba will be processed. For example, databases like dbaTest, dbaProd, etc., will be included in the loop.
176 +** **sys.databases**: A system catalog view that contains information about each database in the SQL Server instance.
216 216  
178 +----
217 217  
180 +====== **4. Opening the Cursor** ======
218 218  
182 +{{code language="sql"}}
183 +OPEN db_cursor
184 +FETCH NEXT FROM db_cursor INTO @DatabaseName
185 +{{/code}}
219 219  
187 +OPEN db_cursor FETCH NEXT FROM db_cursor INTO @DatabaseName
220 220  
189 +* **OPEN db_cursor**: This opens the cursor for reading the results.
190 +* **FETCH NEXT**: The FETCH NEXT statement retrieves the first database name that meets the LIKE 'dba%' condition and stores it in the @DatabaseName variable. This will be used in the next step where the backup procedure is executed.
221 221  
192 +----
222 222  
194 +====== **5. Looping Through Databases** ======
223 223  
196 +{{code language="sql"}}
197 +-- Loop through each database and execute the stored procedure
198 +WHILE @@FETCH_STATUS = 0
199 +BEGIN
200 + -- Print current database for logging/debugging
201 + PRINT 'Backing up database: ' + @DatabaseName
224 224  
203 + -- Execute the DatabaseBackup stored procedure for each database
204 + EXECUTE dba.dbo.DatabaseBackup
205 + @Databases = @DatabaseName, -- Specify the current database
206 + @URL = @BackupContainerURL, -- Azure Blob Storage URL
207 + @BackupType = 'Full', -- Full backup type
208 + @CopyOnly = 'Y', -- Use copy-only backup (this doesn’t affect the transaction log chain)
209 + @Compress = 'Y', -- Enable compression
210 + @Verify = 'N'; -- Skip verification after backup
225 225  
212 +{{/code}}
226 226  
227 227  
215 +* **WHILE @@FETCH_STATUS = 0**: The loop will continue as long as the FETCH command successfully retrieves a database name. @@FETCH_STATUS is a system function that returns 0 if the fetch operation is successful.
216 +* **PRINT**: This line prints the name of the database that is currently being backed up. It helps with logging or debugging purposes, as you can track which database is being processed at any given time.
217 +* (((
218 +**EXECUTE dba.dbo.DatabaseBackup**:
228 228  
220 +* This calls a stored procedure named dba.dbo.DatabaseBackup for each database.
221 +* The parameters passed to the stored procedure:
222 +** **@Databases = @DatabaseName**: Specifies which database to back up (the current database being processed).
223 +** **@URL = @BackupContainerURL**: Specifies the destination Azure Blob Storage URL.
224 +** **@BackupType = 'Full'**: Specifies the backup type, which is a **Full** backup (this means all data in the database is backed up).
225 +** **@CopyOnly = 'Y'**: Specifies that this is a **copy-only backup**. This ensures that the backup does not affect the transaction log chain and does not interfere with regular backups.
226 +** **@Compress = 'Y'**: Enables compression of the backup, reducing the size of the backup file.
227 +** **@Verify = 'N'**: Specifies that the backup verification step should be skipped. (Verification can be added if needed for additional safety.)
228 +)))
229 229  
230 +----
230 230  
232 +====== **6. Fetch the Next Database** ======
231 231  
234 +{{code language="sql"}}
235 + -- Fetch the next database in the cursor
236 + FETCH NEXT FROM db_cursor INTO @DatabaseName
232 232  
238 +{{/code}}
233 233  
240 +~-~- Fetch the next database in the cursor FETCH NEXT FROM db_cursor INTO @DatabaseName
234 234  
242 +* **FETCH NEXT**: After executing the backup for the current database, this statement retrieves the next database from the cursor and stores it in the @DatabaseName variable. The loop will continue until all matching databases have been processed.
243 +
244 +----
245 +
246 +====== **7. Closing and Deallocating the Cursor** ======
247 +
235 235  {{code language="sql"}}
236 -USE master;
237 -GO
238 -CREATE MASTER KEY ENCRYPTION BY PASSWORD = '******';
239 -GO
249 +-- Close and deallocate the cursor to clean up resources
250 +CLOSE db_cursor
251 +DEALLOCATE db_cursor
252 +
240 240  
241 -CREATE CERTIFICATE EBSphere_TDE_SQL2019_Cert WITH SUBJECT = 'Database_Encryption';
242 -GO
254 +{{/code}}
243 243  
244 -BACKUP CERTIFICATE EBSphere_TDE_SQL2019_Cert TO FILE = 'D:\temp\EBSphere_TDE_SQL2019_Cert'
245 -WITH PRIVATE KEY (file = 'D:\temp\EBSphere_TDE_SQL2019_Cert_Key.pvk',
246 -ENCRYPTION BY PASSWORD='*****')
256 +* **CLOSE db_cursor**: This closes the cursor once the loop finishes processing all databases.
257 +* **DEALLOCATE db_cursor**: This deallocates the cursor, freeing up any resources used by the cursor. It’s a good practice to always deallocate cursors to avoid resource leaks.
247 247  
248 -USE Everest_TDE_Master;
249 -GO
250 -CREATE DATABASE ENCRYPTION KEY
251 -WITH ALGORITHM = AES_256
252 -ENCRYPTION BY SERVER CERTIFICATE EBSphere_TDE_SQL2019_Cert;
253 -GO
254 -ALTER DATABASE Everest_TDE_Master
255 -SET ENCRYPTION ON;
256 -GO
259 +====== ======
257 257  
258 -USE Everest_TDE_Master_Documents;
259 -GO
260 -CREATE DATABASE ENCRYPTION KEY
261 -WITH ALGORITHM = AES_256
262 -ENCRYPTION BY SERVER CERTIFICATE EBSphere_TDE_SQL2019_Cert;
263 -GO
264 -ALTER DATABASE Everest_TDE_Master_Documents
265 -SET ENCRYPTION ON;
266 -GO
261 +====== **8. Full Script** ======
262 +
263 +
264 +{{code language="sql"}}
265 +DECLARE @DatabaseName NVARCHAR(128)
266 +DECLARE @BackupContainerURL NVARCHAR(512)
267 +
268 +SET @BackupContainerURL = 'https://zagpebslab.blob.core.windows.net/sql-backups'
269 +
270 +DECLARE db_cursor CURSOR FOR
271 +SELECT name
272 +FROM sys.databases
273 +WHERE name LIKE 'dba%'
274 +
275 +OPEN db_cursor
276 +FETCH NEXT FROM db_cursor INTO @DatabaseName
277 +
278 +WHILE @@FETCH_STATUS = 0
279 +BEGIN
280 +
281 +PRINT 'Backing up database: ' + @DatabaseName
282 +
283 +EXECUTE dba.dbo.DatabaseBackup
284 + @Databases = @DatabaseName,
285 + @URL = @BackupContainerURL,
286 + @BackupType = 'Full',
287 + @CopyOnly = 'Y',
288 + @Compress = 'Y',
289 + @Verify = 'N';
290 +
291 +FETCH NEXT FROM db_cursor INTO @DatabaseName
292 +END
293 +
294 +CLOSE db_cursor
295 +DEALLOCATE db_cursor
296 +
267 267  {{/code}}
298 +
299 +
300 +
301 +
302 +=== ===
303 +
304 +
305 +
306 +
307 +
308 +
309 +
310 +
311 +
312 +
313 +
314 +
315 +
316 +
317 +
image-20250305152543-1.png
Author
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1 +XWiki.rudim
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1 +19.6 KB
Content
XWiki.XWikiComments[0]
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1 +XWiki.rudim
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1 +put the sql code in code tags to start with otherwise its very hard to read
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1 +2025-02-26 16:00:04.223

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