Encryption and decryption in SQL

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how to encrypt and decrypt a integer field in microsoft sql server 2018
using store procedure of encrypt while inserting and decrypt while selecting

What I have tried:

Select num From test Where Uid=1
SELECT
CONVERT( sql_variant, DecryptByKey(num)) AS 'Limit'
FROM test;

Posted 11-Jan-22 0:35am

Rain Nature

Updated 11-Jan-22 2:59am

v2

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_Asif_ · Accepted Answer · 2022-01-11T02:59:00

Solution 2

You can find a very detailed Article with a good example on how to use EncryptionByKey and DecryptionByKey below

https://www.sqlshack.com/an-overview-of-the-column-level-sql-server-encryption/[^]

The article also explains how to use system views to verify the key presences and access rights to do Encryption.

Posted 11-Jan-22 2:59am

_Asif_

Comments

CHill60 11-Jan-22 9:09am

Good article - unfortunately doesn't tell the OP how to encrypt an integer field

_Asif_ 11-Jan-22 9:18am

I don't think type is an issue here, Check this link. https://stackoverflow.com/questions/53984800/how-to-encrypt-and-decrypt-integer-data-type-column-in-sql-server-using-symmetri

CHill60 11-Jan-22 12:41pm

"I don't think type is an issue here" - it's not an 'issue' per se. The OP just needs to cast or convert the int to a varbinary in order to Encrypt it

Maciej Los 11-Jan-22 9:22am

5

_Asif_ 11-Jan-22 9:26am

Thanks. If I remember correctly we could have upvoted the comments previously, now we can't?

Maciej Los 11-Jan-22 10:31am

Up-vote comments? Never (as long as i'm CP member).

CHill60 11-Jan-22 11:38am

You're possibly thinking of messages in the forums compared to comments in QA

CHill60 · Accepted Answer · 2022-01-11T02:26:00

If you look at the documentation at ENCRYPTBYKEY (Transact-SQL) - SQL Server | Microsoft Docs[^] section B it gives this example

SQL

USE AdventureWorks2012;  
  
-- Create a column in which to store the encrypted data.  
ALTER TABLE Sales.CreditCard   
    ADD CardNumber_Encrypted varbinary(128);   
GO  
  
-- Open the symmetric key with which to encrypt the data.  
OPEN SYMMETRIC KEY CreditCards_Key11  
    DECRYPTION BY CERTIFICATE Sales09;  
  
-- Encrypt the value in column CardNumber with symmetric   
-- key CreditCards_Key11.  
-- Save the result in column CardNumber_Encrypted.    
UPDATE Sales.CreditCard  
SET CardNumber_Encrypted = EncryptByKey(Key_GUID('CreditCards_Key11'),   
    CardNumber, 1, CONVERT( varbinary, CreditCardID) );  
GO

What is not clear without looking at the database is that CreditCardID is an int (see Sales.CreditCard - AdventureWorks[^] )

I.e. convert your int to a varbinary in order to Encrypt it. Convert the varbinary returned from DECRYPTBYKEY back to an int on select