# Alg

> **Alg** = *typeof* `ALG_AES_256_GCM` \| *typeof* `ALG_CHUNKED_AES_256_GCM_STREAM`

Defined in: [packages/filecoin-encryption-envelope/src/cose/headers.ts:61](https://github.com/FilOzone/synapse-sdk/blob/5e9df029417d95928e523b01a29bf523e42db418/packages/filecoin-encryption-envelope/src/cose/headers.ts#L61)

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