---
title: alg
framework: appstoreservernotifications
role: symbol
role_heading: Type
path: appstoreservernotifications/alg
---

# alg

The JSON Web Signature (JWS) header parameter that identifies the cryptographic algorithm used to secure the JWS.

## Declaration

```data
string alg
```

## See Also

### JWS header types

- [x5c](appstoreservernotifications/x5c.md)