Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data. The IV does not have to be secret, but should be changed for each session. Asymmetric algorithms require the creation of a public key and a private key. The public key can be made public to anyone, while the private key must known only by the party who will decrypt the data encrypted with the public key. This section describes how to generate and manage keys for both symmetric and asymmetric algorithms.
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The following example creates a database encryption key by using the AES256 algorithm, and protects the private key with a certificate named MyServerCert. USE AdventureWorks2012; GO CREATE DATABASE ENCRYPTION KEY WITH ALGORITHM = AES256 ENCRYPTION BY SERVER CERTIFICATE MyServerCert; GO. RandomKeygen - The Secure Password & Keygen Generator. More Developer Tools More Developer Tools. CodeIgniter Encryption Keys - Can be used for any other 256-bit key requirement. 160-bit WPA Key. 504-bit WPA Key. 64-bit WEP Keys. You can grab the RandomKeygen.com source code from GitHub here. Probably the best way is to use PBKDF2 using SHA256 (which will generate 256 bit output) and a application specific salt & iteration count. You should be aware that using an application specific salt removed quite a lot of the protection from PBKDF2, so you may require additional protection to alleviate this issue. AES supports 128, 192, and 256 bits key sizes and 128 bits block size. AesManaged class is a managed implementation of the AES algorithm. This article demonstrates how to use AesManaged class to apply an AES algorithm to encrypt and decrypt data in.NET and C#. Feels a bit like PHP code. PHP extends the key with zero valued bytes up to 128 bit (then 192 bit or 256 bit depending on the size). It uses the same idea for padding. Both are of course completely idiotic when it comes to cryptographic standards, but there it is. Oh, and many PHP sites use Rijndael with a block size of 256 bit instead of AES too.
Symmetric Keys
The symmetric encryption classes supplied by the .NET Framework require a key and a new initialization vector (IV) to encrypt and decrypt data. Whenever you create a new instance of one of the managed symmetric cryptographic classes using the parameterless constructor, a new key and IV are automatically created. Anyone that you allow to decrypt your data must possess the same key and IV and use the same algorithm. Generally, a new key and IV should be created for every session, and neither the key nor IV should be stored for use in a later session.
To communicate a symmetric key and IV to a remote party, you would usually encrypt the symmetric key by using asymmetric encryption. Sending the key across an insecure network without encrypting it is unsafe, because anyone who intercepts the key and IV can then decrypt your data. For more information about exchanging data by using encryption, see Creating a Cryptographic Scheme.
The following example shows the creation of a new instance of the TripleDESCryptoServiceProvider class that implements the TripleDES algorithm.
When the previous code is executed, a new key and IV are generated and placed in the Key and IV properties, respectively.
Sometimes you might need to generate multiple keys. In this situation, you can create a new instance of a class that implements a symmetric algorithm and then create a new key and IV by calling the GenerateKey and GenerateIV methods. The following code example illustrates how to create new keys and IVs after a new instance of the symmetric cryptographic class has been made.
When the previous code is executed, a key and IV are generated when the new instance of TripleDESCryptoServiceProvider is made. Another key and IV are created when the GenerateKey and GenerateIV methods are called.
Asymmetric Keys
The .NET Framework provides the RSACryptoServiceProvider and DSACryptoServiceProvider classes for asymmetric encryption. These classes create a public/private key pair when you use the parameterless constructor to create a new instance. Asymmetric keys can be either stored for use in multiple sessions or generated for one session only. While the public key can be made generally available, the private key should be closely guarded.
Use a command like the following to copy SSH key: This logs into the server host, and copies keys to the server, and configures them to grant access by adding them to the authorizedkeys file. The copying may ask for a password or other authentication for the server. Only the public key is copied to the server. How to generate an SSH key and add your public key to the server for authentication Step 1: Check for SSH Keys. First, check for existing SSH keys on your computer. Step 2: Generate a new SSH key. With your command line tool still open, enter the text shown below. Step 3: Add your key to the. Generate ssh key and copy to server.
A public/private key pair is generated whenever a new instance of an asymmetric algorithm class is created. After a new instance of the class is created, the key information can be extracted using one of two methods:
The ToXmlString method, which returns an XML representation of the key information.
The ExportParameters method, which returns an RSAParameters structure that holds the key information.
Both methods accept a Boolean value that indicates whether to return only the public key information or to return both the public-key and the private-key information. An RSACryptoServiceProvider class can be initialized to the value of an RSAParameters structure by using the ImportParameters method.
Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more on how to store a private key in a key container, see How to: Store Asymmetric Keys in a Key Container.
The following code example creates a new instance of the RSACryptoServiceProvider class, creating a public/private key pair, and saves the public key information to an RSAParameters structure.