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How good are algorithms used in Javascript Math.random() in different browsers? Is it okay to use it for generating salts and one-time passwords?
How many bits from one random I can use?
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Random numbers and data generated by the random class are not cryptographically protected. An output of all random module functions is not cryptographically secure, whether it is used to create a random number or pick random elements from a sequence.
An unfortunately predictable PRNG called Math. random() . If you're using Node. js (or any other JavaScript environment) in your stack today, the same Math.
The JavaScript Math. random() method is an excellent built-in method for producing random numbers. When Math. random() is executed, it returns a random number that can be anywhere between 0 and 1.
A cryptographically secure pseudo random number generator (CSPRNG), is one where the number that is generated is extremely hard for any third party to predict what it might be.
How do I generate cryptographically secure random numbers in javascript? What exactly do you mean by "cryptographically"? Use Math.random () to return a random number between 0 and 1. Its technically pseudo random, since there isn't really any (simple) way to generate true random numbers.
Everyone seems to have missed a bit of a nuance here: Cryptographic algorithms require a number to be mathematically and statistically random over all executions of the algorithm.
Cryptographically secure is a standard term that means that the value is unpredictable, even to an adversary who is willing to invest a significant amount of time and energy trying to predict it or distinguish it from random. There's been discussion at WHATWG on adding this to the window.crypto object.
Because there actually is a cryptographically secure alternative to Math.random (): This allows the developer to use the right tool for the job. If you want to generate pretty pictures or loot drops for your game, use the fast Math.random (). When you need cryptographically secure random numbers, use the more expensive window.crypto.
Nope; JavaScript's Math.random() function is not a cryptographically-secure random number generator. You are better off using the JavaScript Crypto Library's Fortuna implementation which is a strong pseudo-random number generator (have a look at src/js/Clipperz/Crypto/PRNG.js), or the Web Crypto API for getRandomValues
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