How Can I Optimize SecureRandom Performance in Java?

Optimizing SecureRandom Performance

SecureRandom, essential for generating cryptographically strong random numbers in Java, often suffers from poor performance, particularly when relying on /dev/random in Linux. This performance penalty can be attributed to its blocking behavior while gathering entropy.

Addressing the Performance Issue

To mitigate this issue, one can redirect SecureRandom to the faster /dev/urandom using the following property:

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

However, this solution is incompatible with Java 5 and later due to Java Bug 6202721. To circumvent this, the following modification is recommended:

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

By introducing the extra "/./" prefix, SecureRandom can utilize /dev/urandom effectively without sacrificing performance. This solution has been proven to alleviate the performance bottlenecks associated with /dev/random.

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