---
title: seed
framework: gameplaykit
role: symbol
role_heading: Instance Property
path: gameplaykit/gkarc4randomsource/seed
---

# seed

The seed data that determines the random source’s behavior.

## Declaration

```swift
var seed: Data { get set }
```

## Discussion

Discussion Any two random sources initialized with the same seed data will generate the same sequence of random numbers. To replicate the behavior of an existing GKARC4RandomSource instance, read this property and then create a new instance by passing the resulting data to the init(seed:) initializer. For a source of high-entropy seed data, see the SecRandomCopyBytes(_:_:_:) function.