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| − | = DRAFT CHEAT SHEET - WORK IN PROGRESS = | + | __NOTOC__ |
| | + | <div style="width:100%;height:160px;border:0,margin:0;overflow: hidden;">[[File:Cheatsheets-header.jpg|link=]]</div> |
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| − | = Introduction =
| + | The Cheat Sheet Series project has been moved to [https://github.com/OWASP/CheatSheetSeries GitHub]! |
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| − | This article is focused on providing guidance to storing a password in order to help prevent password theft. Too often passwords are stored as clear text. Thus the password can be read directly by the database’s administrator, super users or via data theft by SQL Injection. Database backup media is also vulnerable to password theft via password storage. It is recommended that you avoid storing the clear text password or an encrypted version of the password.
| + | Please visit [https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html Password Storage Cheat Sheet] to see the latest version of the cheat sheet. |
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| − | == Password Storage Rules ==
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| − | Passwords are secrets. There is no reason to decrypt them under any circumstances. It is crucial that passwords are stored in a way that they can be *verified* but not *reversed* in any way, even by insiders. To accomplish this, store the salted hashed value of the password. Preferably use a different random salt for each password hash instead of a constant long salt.
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| − | # Use a modern hash
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| − | ## SHA
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| − | ## bcrypt
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| − | # Use a long cryptographically random salt
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| − | ## Isolate the salt from the hash
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| − | # Iterate the hash
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| − | == References ==
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| − | Cryptographic framework for password hashing is described in [http://www.rsa.com/rsalabs/node.asp?id=2127 PKCS #5 v2.1: Password-Based Cryptography Standard]. Specific secure password hashing algorithms exist such as [http://www.usenix.org/events/usenix99/provos/provos_html/node1.html bcrypt], [http://www.tarsnap.com/scrypt/scrypt.pdf scrypt]. Implementations of secure password hashing exist for PHP ([http://www.openwall.com/phpass/ phpass]), ASP.NET ([http://msdn.microsoft.com/en-us/library/ms998372.aspx#pagpractices0001_sensitivedata ASP.NET 2.0 Security Practices]), Java ([http://www.owasp.org/index.php/Hashing_Java OWASP Hashing Java]).
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| − | {{Cheatsheet_Navigation}}
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| − | [[Category:Cheatsheets]]
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Latest revision as of 14:20, 15 July 2019
The Cheat Sheet Series project has been moved to GitHub!
Please visit Password Storage Cheat Sheet to see the latest version of the cheat sheet.
