A Framework for DNSSEC Policies and DNSSEC Practice Statements. - Fredrik Ljunggren; Anne-Marie Eklund Löwinder; Tomofumi Okubo (RFC, 2013)

X.509 Certificate General-Purpose Extended Key Usage (EKU) for Document Signing. - Tadahiko Ito; Tomofumi Okubo; Sean Turner (RFC, 2022)

No Revocation Available for X.509 Public Key Certificates. - Russ Housley; Tomofumi Okubo; Joseph Mandel (RFC, 2024)

Using Key Encapsulation Mechanism (KEM) Algorithms in the Cryptographic Message Syntax (CMS). - Russ Housley; John Gray; Tomofumi Okubo (RFC, 2024)