Cryptographic Message Syntax (CMS) https://www.rfc-editor.org/rfc/rfc5652 Enhanced Security Services (ESS) Update: Adding CertID Algorithm Agility https://www.rfc-editor.org/rfc/rfc5035 Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile https://www.rfc-editor.org/rfc/rfc3280 CMS Advanced Electronic Signatures (CAdES) https://datatracker.ietf.org/doc/html/rfc5126 ASN.1 JavaScript decoder https://lapo.it/asn1js ETSI EN 319 142-1 V1.1.1 (2016-04) https://www.etsi.org/deliver/etsi_en/319100_319199/31914201/01.01.01_60/en_31914201v010101p.pdf ETSI EN 319 142-2 V1.1.1 (2016-04) https://www.etsi.org/deliver/etsi_en/319100_319199/31914202/01.01.01_60/en_31914202v010101p.pdf ETSI Signatures Conformance Checker https://signatures-conformance-checker.etsi.org/pub/index.php Digital Signatures for PDF documents https://itextpdf.com/sites/default/files/2018-12/digitalsignatures20130304.pdf adobe iso 32000 https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf

https://www.ietf.org/rfc/rfc3852.txt 5섹션 https://www.rfc-editor.org/rfc/rfc3126.html 3.13.1 https://cca.gov.in/sites/files/pdf/guidelines/CCA-SP.pdf 단일서명 병렬서명 연대서명 https://www.rfc-editor.org/rfc/rfc5752