How to generate a Nonce value for creating a password digest.

Hi,
I need to generate a 'nonce' value - is there a standard java library that can already do this? From what i've read its a random, non repeatable set of bytes.
This nonce is used in the calculation of a password digest to create a WS-Security UsernameToken.
Thanks in advance.

If you need a non-repeatable sequence of bytes, you'll could use a simple sequence generator (a counter). The problem with a counter is that you'll need to centralize and coordinate the generation of such sequence. (For instance, retrieving the value from a Oracle database "SEQUENCE").
But for most practical needs using a cryptographically-safe random number generator like SecureRandom (that tries to use the /dev/random device in Linux & Solaris, and the MS CryptoAPI provider in Windows, using true hardware random number generators if available and correctly installed) is good enough.

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