[1] RFC 2985 - PKCS #9: Selected Object Classes and Attribute Types Version 2.0 (2014-12-28 18:45:38 +09:00 版) http://tools.ietf.org/html/rfc2985

[2] RFC 2985 - Status of this memo (2016-06-19 16:47:38 +09:00) https://tools.ietf.org/html/rfc2985

[3] RFC 7894 - Alternative Challenge Password Attributes for Enrollment over Secure Transport (2016-06-23 20:15:41 +09:00) https://tools.ietf.org/html/rfc7894

[4] DSIG