How Can I Speed Up SecureRandom's Random Number Generation in Java?

Speeding Up SecureRandom for Efficient Random Number Generation

SecureRandom is indispensable for generating cryptographically secure random numbers in Java, but its reliance on /dev/random on Linux can lead to sluggish performance. This article explores solutions to mitigate this performance penalty.

Overcoming the Slowness of SecureRandom

To avoid blocking while waiting for sufficient entropy, you can employ alternative entropy sources. One such solution is to use /dev/urandom, which offers faster generation but slightly lower security. This can be enabled using the following command:

-Djava.security.egd=file:/dev/urandom

Addressing Java 5 and Later Bugs

However, this method is incompatible with Java 5 and later due to Java Bug 6202721. To resolve this issue, use the following modified command:

-Djava.security.egd=file:/dev/./urandom

Uncommon Maths as a Solution (Question)

The provided text does not mention Uncommon Maths as a solution to this performance issue.

JDK 6 Improvements (Question)

The article does not directly confirm whether the performance problem has been resolved in JDK 6.

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