[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) › Entropy28

```ts
type Entropy28 = Uint8Array<ArrayBufferLike> &
  import("./Brand.ts").Brand<"Entropy"> &
  import("./Brand.ts").Brand<"Length28">;
```

Defined in: [packages/common/src/Crypto.ts:127](https://github.com/evoluhq/evolu/blob/bc4578a260dd15d5bbf94b83765ca05984d194cb/packages/common/src/Crypto.ts#L127)

Cryptographic entropy of exactly 28 bytes.