How do I access /dev/urandom in crypto/Rand?
As a cryptocurrency and finance practitioner, I'm curious about the use of `/dev/urandom` within the crypto/Rand subsystem. Could you elaborate on the steps necessary to access and utilize this device for generating cryptographically secure random numbers? Understanding its integration within crypto/Rand would be particularly valuable for me in terms of securing cryptographic operations. Are there any specific APIs or methods I should be aware of to access `/dev/urandom` efficiently and securely within this subsystem? Additionally, I'm interested in knowing if there are any considerations or best practices to keep in mind while using `/dev/urandom` for cryptographic purposes.