# Alg

> **Alg** = *typeof* [`ALG_AES_256_GCM`](/reference/filoz/filecoin-encryption-envelope/namespaces/constants/variables/alg_aes_256_gcm/) \| *typeof* [`ALG_CHUNKED_AES_256_GCM_STREAM`](/reference/filoz/filecoin-encryption-envelope/namespaces/constants/variables/alg_chunked_aes_256_gcm_stream/)

Defined in: [packages/filecoin-encryption-envelope/src/cose/headers.ts:60](https://github.com/FilOzone/synapse-sdk/blob/8134b6099790f00c19d60988ce43c37782880b8b/packages/filecoin-encryption-envelope/src/cose/headers.ts#L60)

One of the two content-encryption schemes supported by this package.