说明：  asn1 ber der 编码子集入门指南说明文档 RSA实验室的一份技术笔记本文简单介绍了OSI 抽象语法符号（ASN.1）的子集——基本编码规则（BER）和可辨别编码规则（DER）。本文的主要目的是为理解和实现PKCS协议族提供足够的背景材料。
(asn1 ber der encoding a subset of the Getting Started documentation RSA Laboratories Technical notebook paper a brief introduction of the OSI Abstract Syntax Notation (ASN.1) a subset of- Basic Encoding Rules (BER) and identifiable Encoding Rules (DER) . The main purpose of this paper is to understand and implement PKCS protocol suite to provide sufficient background material.)