The Go rand package provides functions for generating pseudo-random numbers. By default, these numbers are based on a specific seed value, leading to predictable results with each run. This can be problematic when generating true pseudo-random numbers for applications that require unpredictable outcomes.
To address this issue, you need to initialize the random generator with a unique seed value that varies with each run. A common practice is to use the current time in nanoseconds:
<code class="go">import "time" func main() { rand.Seed(time.Now().UnixNano()) fmt.Println(rand.Int31n(100)) }</code>
This approach leverages the fact that the current time is constantly changing. As a result, the random numbers generated will differ with each execution.
For applications where security is paramount, such as pass-phrase generators, consider using the crypto/rand package instead of the rand package. The functions in crypto/rand rely on more advanced techniques to generate stronger random numbers. However, note that these functions may be significantly slower.
By setting a unique seed value, you can ensure that the Go rand package generates true pseudo-random numbers. The rand package is suitable for most applications, but crypto/rand offers enhanced security at a potential performance cost.
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