algorithm

This header parameter is used to indicate the algorithm used for the security processing. This header parameter MUST be authenticated where the ability to do so exists. This support is provided by AEAD algorithms or construction (e.g., COSE_Sign and COSE_Mac0). This authentication can be done either by placing the header parameter in the protected-header-parameters bucket or as part of the externally supplied data (Section 4.3). The value is taken from the "COSE Algorithms" registry.