public Random getRandom() {
        return this.random;
    }
Generates session IDs by using a {@link Random} instance to generate random IDs. The default {@code Random}
implementation is a {@link java.security.SecureRandom SecureRandom} with the {@code SHA1PRNG} algorithm.

@since 1.0
core/src/main/java/org/apache/shiro/session/mgt/eis/RandomSessionIdGenerator.java