[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Crypto](https://evolu.dev/docs/api-reference/common/Crypto) › Entropy24

```ts
type Entropy24 = Uint8Array<ArrayBufferLike> &
  import("./Brand.ts").Brand<"Entropy"> &
  import("./Brand.ts").Brand<"Length24">;
```

Defined in: [packages/common/src/Crypto.ts:110](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Crypto.ts#L110)

Cryptographic entropy of exactly 24 bytes.