[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Auth](https://evolu.dev/docs/api-reference/common/local-first/Auth) › DeviceSecretKeyId

```ts
type DeviceSecretKeyId = Uint8Array<ArrayBufferLike> &
  import("../Brand.ts").Brand<"MaxLength1023"> &
  import("../Brand.ts").Brand<"MinLength1"> &
  import("../Brand.ts").Brand<"DeviceSecretKeyId">;
```

Defined in: [packages/common/src/local-first/Auth.ts:132](https://github.com/evoluhq/evolu/blob/aa223771feea747ffb1b0f5f3271574455633e37/packages/common/src/local-first/Auth.ts#L132)

The id of a key that wraps a [DeviceSecret](https://evolu.dev/docs/api-reference/common/local-first/Auth/variables/DeviceSecret), such as a passkey's
credential ID, from 1 to 1023 bytes as WebAuthn allows.