SELECT name, password_hash FROM sys.sql_logins WHERE name = 'sa';
-- Step 1: Get the encrypted blob SELECT name, remote_user, encrypted_password FROM sys.linked_logins; -- Step 2: Decrypt it (requires sysadmin role) OPEN SYMMETRIC KEY SMK_KEY DECRYPTION BY CERTIFICATE SMK_Cert;
EXEC sp_addlinkedsrvlogin 'MyRemoteServer', 'false', NULL, 'remote_user', 'Secret123!'; SQL Server encrypts 'Secret123!' using the (SMK) or a database master key. This can be decrypted if you have admin access. sql server password decrypt
| What they ask | What they mean | Technical Reality | |---------------|----------------|-------------------| | "Decrypt the sa password" | Recover the plaintext password for sa | (lossy one-way hash) | | "Decrypt a linked server password" | Reveal stored credentials for a remote server | Possible (reversible encryption) | Critical Takeaway: SQL Server login passwords (stored in master.dbo.sysxlogins or sys.sql_logins ) are hashed , not encrypted. Hashing is one-way; encryption is two-way. 2. What a “SQL Server Password” Actually Looks Like (Inside the Database) Using a simple query, you can see the stored verifier:
Secret123! appears in plaintext. 4. Real-World Attack Flow (Red Team Perspective) If an attacker gains sysadmin access to a SQL Server, here’s how they “decrypt” valuable passwords: SELECT name, password_hash FROM sys
SELECT CAST(DecryptByKey(encrypted_password) AS varchar(100)) FROM sys.linked_logins;
The request “decrypt sql server password” is technically incorrect 90% of the time. What people actually need is password cracking (for hashes) or recovery using the service master key (for linked servers). One is computationally expensive, the other is trivially easy — and that asymmetry is where most security breaches happen. Report prepared for educational and forensic use only. Unauthorized password recovery from systems you do not own is illegal. Hashing is one-way; encryption is two-way
I have structured this as a —debunking myths, explaining the reality, and demonstrating practical (ethical) techniques. The Myth of Decryption: A Forensic Report on SQL Server Passwords Classification: Internal / Security Research Subject: Analysis of SQL Server Authentication Credential Storage Key Finding: SQL Server does not store passwords that can be "decrypted." It stores hashes (salted verifiers). However, "decrypt" is a common red-team request—this report clarifies what is actually possible. 1. The Fundamental Confusion (Why “Decrypt” is Wrong) Most people asking to "decrypt" a SQL Server password actually want one of two things: