Is it Possible to Generate Truly Random Numbers in Go?

Random Numbers in Go: Getting True Pseudo Randomness

In Go, the rand package plays a crucial role in generating pseudo random numbers. However, users may notice that the same code snippet repeatedly generates the same output. This raises the question: is there a way to obtain truly random results with every execution?

Understanding Pseudo Randomness

The rand package utilizes an algorithm that produces pseudo random numbers based on a specific initial value, known as the "seed." When the package is initialized without explicitly setting a seed, it defaults to using a fixed value. This leads to the same sequence of random numbers being generated every time the code is executed.

Setting a Variable Seed

To break this pattern and obtain distinct random numbers, one solution is to set a variable seed. A popular approach is to use the current time as the seed, which differs with each execution. This can be achieved with the following code:

<code class="go">rand.Seed(time.Now().UnixNano())</code>

Using crypto/rand Package

For heightened security, consider using the crypto/rand package. This package provides more robust random number generation by leveraging factors such as mouse movements and processor temperature. However, its downside lies in its slower speed compared to the standard rand package. Unless your application demands high-security random numbers (e.g., pass-phrase generators), the rand package generally suffices.

The above is the detailed content of Is it Possible to Generate Truly Random Numbers in Go?. For more information, please follow other related articles on the PHP Chinese website!