Doc 9303第七版代表了国际民航组织机器可读旅行规范的重组 文件。在没有对规范进行实质性修改的情况下，新版Doc 9303已重新格式化为一号机读公务旅行证件（TD1）、二号机读公务旅行证件（TD2）和三号机读旅行证件（TD3）以及签证的一套规范。这套规范由各种单独的文件组成，其中包括通用规范（适用于所有MRTD）和MRTD形状系数特定规范。Doc 9303第12部分以Doc 9303第6版第1部分机器可读护照第2卷为基础 具有生物识别功能的电子护照规范（2006年）和Doc 9303第三版，第3部分，机读公务旅行证件，第2卷，具有生物识别功能的电子MRTDs规范（2008年）。第12部分定义了eMRTD应用程序的公钥基础设施（PKI）。对签发国或国家的要求 指定了组织，包括颁发证书和CRL的证书颁发机构（CA）的运营。 还规定了接收国及其检验系统验证这些证书和CRL的要求。

The Seventh Edition of Doc 9303 represents a restructuring of the ICAO specifications for Machine Readable Travel Documents. Without incorporating substantial modifications to the specifications, in this new edition Doc 9303 has been reformatted into a set of specifications for Size 1 Machine Readable Official Travel Documents (TD1), Size 2 Machine Readable Official Travel Documents (TD2), and Size 3 Machine Readable Travel Documents (TD3) size documents, as well as visas. This set of specifications consists of various separate documents in which general (applicable to all MRTDs) as well as MRTD form factor specific specifications are grouped.This Part 12 of Doc 9303 is based on the Sixth Edition of Doc 9303, Part 1, Machine Readable Passports, Volume 2 Specifications for Electronically Enabled Passports with Biometric Identification Capability (2006) and the Third Edition of Doc 9303, Part 3, Machine Readable Official Travel Documents, Volume 2, Specifications for Electronically Enabled MRTDs with Biometric Identification Capability (2008).Part 12 defines the Public Key Infrastructure (PKI) for the eMRTD application. Requirements for issuing States or organizations are specified, including operation of a Certification Authority (CA) that issues certificates and CRLs. Requirements for receiving States and their Inspection Systems validating those certificates and CRLs are also specified.