golang cryto/rand random number example

randNumber.go

package main
// https://play.golang.org/p/3DeMCc248KQ

import (
	"crypto/rand"
	"encoding/binary"
	"fmt"
)

func main() {
	var v uint64
	binary.Read(rand.Reader, binary.BigEndian, &v)
	fmt.Println(v)
}