There is a sub-registry of Red Hat OIDs managed through gnutls. This file is the canonical registry description of them. Top OID: 1.3.6.1.4.1.2312.18 1.3.6.1.4.1.2312.18.8 PKCS#8 attributes tree 1.3.6.1.4.1.2312.18.8.1 PKCS#8 Provable Seed attribute [0] [0]. This is an attribute to be used in PKCS#8 privateKeyInfo structure as an extension. It holds parameters related to private key validation for provable private keys as in FIPS186-4. When the OID is present it contains a single DER encoded value of the following. ProvableSeed ::= SEQUENCE { algorithm OBJECT IDENTIFIER, -- the OID of the hash algorithm used in the key generation seed OCTET STRING -- the seed used in key generation }