08.08.2020
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Random Key Generation Algorithm In Java Average ratng: 3,3/5 3173 reviews
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A Key pair generator for a particular algorithm creates a public/private key pair that can be used with this algorithm. It also associates algorithm-specific parameters with each of the generated keys. There are two ways to generate a key pair: in an algorithm-independent manner, and in an algorithm. Key generators are constructed using one of the getInstance class methods of this class. KeyGenerator objects are reusable, i.e., after a key has been generated, the same KeyGenerator object can be re-used to generate further keys. There are two ways to generate a key: in an algorithm-independent manner, and in an algorithm-specific manner. On Linux, there are two devices provided by the operating system that Java can read to get random seeds for new SecureRandom instances. One of the devices only returns random bits (generated slowly by timing various system events), and if you consume a lot of entropy on the system, it will soon block, and take a while to create new instances.
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The Java KeyGenerator class (javax.crypto.KeyGenerator) is used to generate symmetric encryption keys. 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
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() 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
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:
The KeyGeneratorinit() method takes two parameters: The bit size of the keys to generate, and a SecureRandom that is used during key generation.
Generating a Key
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:
Right 1
Greenhorn
posted 8 years ago
hii frnds need help in the algorithm required for random key generation algorithm and code for my project ....for encrypting the datafile ...and even for decrypting also
thnks ;
thnks ;
Saloon Keeper
posted 8 years agoWhat do you have so far, and where are you stuck making progress? If you haven't started yet, what ideas have you had?
Bartender
posted 8 years agoHang on, you should be showing some effort. You cannot expect people here to just tell you the algorithm and also give you the code. So if you need someone to do that then you must hire someone to do that.
Mohamed Sanaulla My Blog Author of Java 9 Cookbook Java 11 Cookbook
Bartender
posted 8 years agoHi, and welcome to the Ranch!
It's not at all clear what your requirments are, or what part you're having trouble with. Please TellTheDetails(⇐click) so people will have a better understanding and be better able to guide you.
Also, please UseOneThreadPerQuestion.(⇐click) Posting the same question multiple times leads to fragmented discussions.
https://coderanch.com/t/571137/java/java/help-random-key-generation-algorithm
https://coderanch.com/t/571135/java/java/hii-algorithm-code-encryption-decryption
It's not at all clear what your requirments are, or what part you're having trouble with. Please TellTheDetails(⇐click) so people will have a better understanding and be better able to guide you.
Also, please UseOneThreadPerQuestion.(⇐click) Posting the same question multiple times leads to fragmented discussions.
https://coderanch.com/t/571137/java/java/help-random-key-generation-algorithm
https://coderanch.com/t/571135/java/java/hii-algorithm-code-encryption-decryption
Rancher
posted 8 years ago
Saloon Keeper
posted 8 years agoThe book 'Core Java 6' (I think it was volume II) had an excellent example of a generate/encode/decode java program.
Greenhorn
posted 8 years agoTim Moores wrote:What do you have so far, and where are you stuck making progress? If you haven't started yet, what ideas have you had?
we are thinking to develop a project .. in which on providing a key as an input ..should produce or generate a random key(number) which is used in encryption of a datafile ...could you suggest me any algorithm which is useful or wit any reference book ..please
thank you
Sheriff
posted 8 years agoCryptography is highly complicated subject. It is very easy to mess things up in a single piece of code and compromise the security of the overall solution. To be able to generate safe keys for encryption, you'd need very strong knowledge in cryptography, which you're not going to infer from a single book or internet discussion. If you're interested, you might read how some innocuous shortcomings in the design and use of the Enigma encoding machine helped the allies break the cipher in the WW2.
If you need the encryption to survive a determined attack, you should definitely obtain proper security certificate from a professional company and use that to do the encryption. Somebody (not me) might be able to help you with the details. If this top-notch security is not actually your goal, a simpler solution might suffice. In any case, the Security forum would be probably better suited for the discussion.
If you need the encryption to survive a determined attack, you should definitely obtain proper security certificate from a professional company and use that to do the encryption. Somebody (not me) might be able to help you with the details. If this top-notch security is not actually your goal, a simpler solution might suffice. In any case, the Security forum would be probably better suited for the discussion.
Greenhorn
posted 6 years agohii frnds need help in the algorithm required for random key generation algorithm and code for my project ....for encrypting the datafile ...and even for decrypting also
Rancher
posted 6 years agoTim asked a spot-on question way back when: Tim Moores wrote:What do you have so far, and where are you stuck making progress? If you haven't started yet, what ideas have you had?
Bartender
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posted 6 years agodurai pandi wrote:hii frnds need help in the algorithm required for random key generation algorithm and code for my project ....for encrypting the datafile ...and even for decrypting also
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Durai,1. Welcome to JavaRanch.
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2. Please don't revive old threads to simply re-post the same question. It's called 'hi-jacking' - and it's frowned on on almost any site; not just ours.Winston
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