The Java KeyGenerator class (javax.crypto.KeyGenerator) is used to generate symmetric encryption keys. Windows 10 key generator free. A symmetric encryption key is a key that is used for both encryption and decryption of data, by a symmetric encryption algorithm. In this Java KeyGenerator tutorial I will show you how to generate symmetric encryption keys.
Creating a KeyGenerator Instance
Each AES cipher has a 128-bit block size, with key sizes of 128, 192, and 256 bits, respectively. The AES ciphers have been analyzed extensively and are now used worldwide, as was the case with its predecessor, the Data Encryption Standard (DES). The result of the combination of the 256-bit Rijndael/AES secret key, the unknowable (therefore secret) present value of the 128-bit monotonically incrementing counter, and the 128-bit secret Initialization Vector (IV) is 512-bits of secret data providing extremely high security for the generation of this page's 'perfect passwords'.
Before you can use the Java KeyGenerator class you must create a KeyGenerator instance. You create a KeyGenerator instance by calling the static method getInstance()Powershell generate ssh key windows10. passing as parameter the name of the encryption algorithm to create a key for. Here is an example of creating a Java KeyGenerator instance:
This example creates a KeyGenerator instance which can generate keys for the AES encryption algorithm.
Initializing the KeyGenerator
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After creating the KeyGenerator instance you must initialize it. Initializing a KeyGenerator instance is done by calling its init() method. Here is an example of initializing a KeyGenerator instance:
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The KeyGeneratorinit() method takes two parameters: The bit size of the keys to generate, and a SecureRandom that is used during key generation.
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Generating a Key
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Once the Java KeyGenerator instance is initialized you can use it to generate keys. Generating a key is done by calling the KeyGeneratorgenerateKey() method. Here is an example of generating a symmetric key: