Mkey Generator Salt

[Edco Haglund]

The Spring Security Crypto module provides support for symmetric encryption, key generation, and password encoding. The code is distributed as part of the core module but has no dependencies on any other Spring Security (or Spring) code.

The Encryptors class provides factory methods for constructing symmetric encryptors. Using this class, you can create ByteEncryptors to encrypt data in raw byte[] form. You can also construct TextEncryptors to encrypt text strings. Encryptors are thread-safe.

Users may also use the standard encryption method, which is 256-bit AES in Cipher Block Chaining (CBC) Mode.This mode is not authenticated and does not provide anyguarantees about the authenticity of the data.For a more secure alternative, users should prefer Encryptors.stronger.

The difference between a queryable TextEncryptor and a standard TextEncryptor has to do with initialization vector (iv) handling. The iv used in a queryable TextEncryptor#encrypt operation is shared, or constant, and is not randomly generated. This means the same text encrypted multiple times will always produce the same encryption result. This is less secure, but necessary for encrypted data that needs to be queried against. An example of queryable encrypted text would be an OAuth apiKey.

The KeyGenerators class provides a number of convenience factory methods for constructing different types of key generators. Using this class, you can create a BytesKeyGenerator to generate byte[] keys. You can also construct a StringKeyGenerator to generate string keys. KeyGenerators are thread-safe.

The BCryptPasswordEncoder implementation uses the widely supported "bcrypt" algorithm to hash the passwords. Bcrypt uses a random 16 byte salt value and is a deliberately slow algorithm, in order to hinder password crackers. The amount of work it does can be tuned using the "strength" parameter which takes values from 4 to 31. The higher the value, the more work has to be done to calculate the hash. The default value is 10. You can change this value in your deployed system without affecting existing passwords, as the value is also stored in the encoded hash.

The Pbkdf2PasswordEncoder implementation uses PBKDF2 algorithm to hash the passwords.In order to defeat password cracking PBKDF2 is a deliberately slow algorithm and should be tuned to take about .5 seconds to verify a password on your system.

In this article, we will explore everything there is to know about WordPress salts and generators, helping you ensure you can make the most out of this feature that is so important to WordPress security.

WordPress salts, and the associated security keys, are cryptographic tools used to hash data. They are also known as WordPress security keys. One notable example of how they are used on a website is the hashing of passwords stored in cookies. Salts make it much harder for hackers to steal user passwords. This makes salts an integral part of WordPress security. While this system is not perfect, it provides adequate protection in most cases.

For WordPress to recognize you, this cookie has to be sent to WordPress every time you interact with the website, essentially authenticating yourself every time you interact with the website. To make sure the data remains as safe as possible, WordPress encrypts the password stored in the cookie. This is where salts come in.

Each salt has a corresponding key, and both are required for the data hashing to take place. In reality, the keys are used to hash the data, and the salts add a second layer of hashing to ensure the data is extra safe.

Salts and keys live in the WordPress wp-config.php file. You can access the file through SSH or FTP/SFTP, depending on your WordPress hosting provider. Some providers may even offer their own custom backend file manager with access to the configuration file.

You may also choose to change them as a preventative security measure rather than out of any particular need. Just like regularly changing your password, changing your salts and keys can keep you one step ahead of malicious actors.

Do note that updating to new salts and keys will terminate all active sessions since this would invalidate all active cookies. Logged-in users will be logged out. Users will be able to log back in with their username, password, and 2FA just fine, so this is nothing to worry about but something you should be aware of.

In most cases, a plugin will generate and replace the salts for you. It only requires access to the WordPress admin area, making it the easiest of the two. The manual method is slightly more hands-on; however, even a not-so-technical person can get it done.

Do note that if you choose to change salts manually but have never done this before, using a testing environment first might be a good idea. This will allow you to gain confidence without risking breaking your site.

The easiest way to change your WordPress salts is by using a plugin. The Salt Shaker plugin is perhaps the most known plugin for exchanging your WordPress salt keys with added features such as scheduled changes.

To change the salt keys at any point, simply click the Change Now button located in the Immediate Change section. This will update all salts straight away. Any logged-in users will need to log back in once the salts are updated.

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This article describes a sample class library which you can use to generate salts and encrypted passwords. Taken together, these can be used to perform such functions such as verifying a user's entered password against that which is stored to see if the user has entered the correct password. This class library does not attempt to provide a new encryption algorithm but rather aggregates existing encryption functionality together for ease of use. The assumption is that your application users salted passwords were recorded in an encrypted state in a data store such as a database. Also assumed is that those with strong security needs will supplement encryption with multi-factor authentication.

Have you ever worked in an organization which struggled with unnecessary variation in its code base, meaning that there exists multiple different coding styles to satisfy the exact same results, making code management frustrating? Specifically, have you ever had multiple applications in which each had a different security model even though the security needs for each application were the same?

This article describes a simple class library that can be used uniformly across your projects to help in the effort to cut down on unnecessary code variation. Specifically, the class library provides key hashing with salt capability. For my purposes, I had "wrapped" a web API around this class library, so that all applications would consistently communicate with the class library methods through the web API, but of course, you only need do this if it makes sense in your situation.

The source code exists within a Visual Studio solution named HashKeyProvider and when compiled, provides two class library files as DLLs, HashGenerator and SaltGenerator. I used Visual Studio Professional 2017 with the .NET Framework 4.6.1 for each of the projects within the solution. I also used MS Test for the unit tests (existing within its own unit test project) which provides for a nice way of demonstrating the code, as well as, testing it. At the time of this writing, I'm using the SHA512 algorithm for encrypting passwords.

If you'll recall, it is not a good security practice to store user passwords without first encrypting them, meaning that passwords should be stored in an encrypted state. The encryption function should be deterministic, meaning that for the same entered password, their encrypted values should match. This provides a means of verifying a user's currently entered password against a previously stored one in an encrypted state, the stored one usually existing in a database. Even if the stored encrypted value is hacked, the hacker will not know what the underlying password is from which the encrypted version came from. This statement is true assuming that the encryption function is non-invertible, meaning that the input value of the function (the domain) cannot be inferred from the output value of the function (the range).

For added security, it is best to "salt" a password prior to encrypting it. Our assumption is that every generated salt should be different, non-deterministic, and use a random number generator to achieve this goal.

The Visual Studio HashKeyProvider solution is split into three projects. The core implementation of the class methods are contained within a project named Core and contains their HashGenerator and SaltGenerator classes. The interfaces are stored within a project named Core.Interfaces, and the unit tests are stored within a test project named UnitTestProject.

For instance, say that we have a new application user for which we want to store their encrypted password. Prior to encrypting their password, we'll want to generate a random salt. The CreateRandomSalt method accomplishes this and returns the generated salt to its caller.

You'll notice that there is no code as part of this library which actually submits or retrieves a password or salt. That is the responsibility of other code (separation of concerns), as the purpose of this class library is to merely generate salts and encrypt passwords with their salts. Neither have I mentioned how the salt and unencrypted password are sent to the methods in this code library, such as whether communication between the caller and these methods are accomplished using TLS, etc. In my usage, this class library is one piece of a larger security model which may be different than your needs, so I've left these details up to you to fill in.

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