ETSI TS 119 142-1规定了PAdES数字签名。PAdES签名基于中指定的PDF签名 ISO 32000-1[1]采用替代签名编码，以支持与签名等效的数字签名格式 按照ETSI TS 119 122-1[2]中的规定，通过合并有符号和无符号属性来格式化CADE，这些属性满足 一些用例中的某些常见需求（例如数字签名的长期有效性）。本文件规定了PAdES基线签名的格式，这些格式提供了 电子程序和通信的广泛商业和政府用例适用于 当电子商务中使用的数字签名明确需要互操作性时，广泛的社区 文件。本文件定义了四个级别的PAdES基线签名，以满足 长期保持签名的有效性，某种程度上始终解决所有问题 在低于它的级别上解决需求。 每一级都需要适当地显示某些PAdES属性 为了尽可能减少可选性而进行了分析。PAdES数字签名的创建和验证程序超出了范围，并在ETSI中进行了规定 TS 119 102[i.5]。

ETSI TS 119 142-1, specifies PAdES digital signatures. PAdES signatures build on PDF signatures specified in ISO 32000-1 [1] with an alternative signature encoding to support digital signature formats equivalent to the signature format CAdES as specified in ETSI TS 119 122-1 [2], by incorporation of signed and unsigned attributes, which fulfil certain common requirements (such as the long term validity of digital signatures) in a number of use cases.The present document specifies formats for PAdES baseline signatures, which provide the basic features necessary for a wide range of business and governmental use cases for electronic procedures and communications to be applicable to a wide range of communities when there is a clear need for interoperability of digital signatures used in electronic documents.The present document defines four levels of PAdES baseline signatures addressing incremental requirements to maintain the validity of the signatures over the long term, in a way that a certain level always addresses all the requirements addressed at levels that are below it. Each level requires the presence of certain PAdES attributes, suitably profiled for reducing the optionality as much as possible.Procedures for creation and validation of PAdES digital signatures are out of scope and specified in ETSI TS 119 102 [i.5].