"ID",Description,Reference
0,Reserved,[RFC9580]
1,Reserved,[RFC9580]
2,Signature Creation Time,"[RFC9580, Section 5.2.3.11]"
3,Signature Expiration Time,"[RFC9580, Section 5.2.3.18]"
4,Exportable Certification,"[RFC9580, Section 5.2.3.19]"
5,Trust Signature,"[RFC9580, Section 5.2.3.21]"
6,Regular Expression,"[RFC9580, Section 5.2.3.22]"
7,Revocable,"[RFC9580, Section 5.2.3.20]"
8,Reserved,[RFC9580]
9,Key Expiration Time,"[RFC9580, Section 5.2.3.13]"
10,Placeholder for backward compatibility,[RFC9580]
11,Preferred Symmetric Ciphers for v1 SEIPD,"[RFC9580, Section 5.2.3.14]"
12,Revocation Key (deprecated),"[RFC9580, Section 5.2.3.23]"
13-15,Reserved,[RFC9580]
16,Issuer Key ID,"[RFC9580, Section 5.2.3.12]"
17-19,Reserved,[RFC9580]
20,Notation Data,"[RFC9580, Section 5.2.3.24]"
21,Preferred Hash Algorithms,"[RFC9580, Section 5.2.3.16]"
22,Preferred Compression Algorithms,"[RFC9580, Section 5.2.3.17]"
23,Key Server Preferences,"[RFC9580, Section 5.2.3.25]"
24,Preferred Key Server,"[RFC9580, Section 5.2.3.26]"
25,Primary User ID,"[RFC9580, Section 5.2.3.27]"
26,Policy URI,"[RFC9580, Section 5.2.3.28]"
27,Key Flags,"[RFC9580, Section 5.2.3.29]"
28,Signer's User ID,"[RFC9580, Section 5.2.3.30]"
29,Reason for Revocation,"[RFC9580, Section 5.2.3.31]"
30,Features,"[RFC9580, Section 5.2.3.32]"
31,Signature Target,"[RFC9580, Section 5.2.3.33]"
32,Embedded Signature,"[RFC9580, Section 5.2.3.34]"
33,Issuer Fingerprint,"[RFC9580, Section 5.2.3.35]"
34,Reserved,[RFC9580]
35,Intended Recipient Fingerprint,"[RFC9580, Section 5.2.3.36]"
37,Reserved (Attested Certifications),[RFC9580]
38,Reserved (Key Block),[RFC9580]
39,Preferred AEAD Ciphersuites,"[RFC9580, Section 5.2.3.15]"
40-99,Unassigned,
100-110,Private or Experimental Use,[RFC9580]
111-127,Unassigned,