Flag,Definition,Reference
0x01...,This key may be used to make User ID certifications (Signature Type IDs 0x10-0x13) or Direct Key signatures (Signature Type ID 0x1F) over other keys.,[RFC9580]
0x02...,This key may be used to sign data.,[RFC9580]
0x04...,This key may be used to encrypt communications.,[RFC9580]
0x08...,This key may be used to encrypt storage.,[RFC9580]
0x10...,"The private component of this key may have been    
split by a secret-sharing mechanism.",[RFC9580]
0x20...,This key may be used for authentication.,[RFC9580]
0x80...,"The private component of this key may be in the    
possession of more than one person.",[RFC9580]
0x0004...,Reserved (ADSK),[RFC9580]
0x0008...,Reserved (timestamping),[RFC9580]