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strong-passwords.md

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title Strong Passwords | Microsoft Docs
ms.custom
ms.date 06/13/2017
ms.prod sql-server-2014
ms.reviewer
ms.technology security
ms.topic conceptual
helpviewer_keywords
logins [SQL Server], passwords
passwords [SQL Server], strong
symbols [SQL Server]
security [SQL Server], passwords
passwords [SQL Server], symbols
characters [SQL Server], password policies
strong passwords [SQL Server]
ms.assetid 338548f4-c4d8-47ca-b597-5c9c0f2fa205
author VanMSFT
ms.author vanto
manager craigg

Strong Passwords

Passwords can be the weakest link in a server security deployment. You should always take great care when you select a password. A strong password has the following characteristics:

  • Is at least 8 characters long.

  • Combines letters, numbers, and symbol characters within the password.

  • Is not found in a dictionary.

  • Is not the name of a command.

  • Is not the name of a person.

  • Is not the name of a user.

  • Is not the name of a computer.

  • Is changed regularly.

  • Is significantly different from previous passwords.

[!INCLUDEmsCoName] [!INCLUDEssNoVersion] passwords can contain up to 128 characters, including letters, symbols, and digits. Because logins, user names, roles, and passwords are frequently used in [!INCLUDEtsql] statements, certain symbols must be enclosed by double quotation marks (") or square brackets ([ ]). Use these delimiters in [!INCLUDEtsql] statements when the [!INCLUDEssNoVersion] login, user, role, or password has the following characteristics:

  • Contains or starts with a space character.

  • Starts with the $ or @ character.

If used in an OLE DB or ODBC connection string, a login or password must not contain the following characters: [] {}() , ; ? * ! @. These characters are used to either initialize a connection or separate connection values.

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Password Policy