DER编码-Distinguished Encoding Rules

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已于 2022-05-18 09:07:58 修改 · 602 阅读

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于 2022-05-17 16:32:13 首次发布

DER（Distinguished Encoding Rules）是ASN.1数据结构的明确编码方式，用于产生唯一的转移语法，尤其在加密和数字签名中确保数据的一致表示。它限制了BER（Basic Encoding Rules）的一些选项，如强制使用最短长度编码、原始编码形式以及按标签排序的集合元素编码。DER被广泛应用于X.509数字证书。

DER (Distinguished Encoding Rules) is a restricted variant of BER for producing unequivocal transfer syntax for data structures described by ASN.1. Like CER, DER encodings are valid BER encodings. DER is the same thing as BER with all but one sender's options removed.

DER is a subset of BER providing for exactly one way to encode an ASN.1 value. DER is intended for situations when a unique encoding is needed, such as in cryptography, and ensures that a data structure that needs to be digitally signed produces a unique serialized representation. DER can be considered