代码签名通过对软件和应用进行数字签名，能够有效防止软件包被第三方篡改。 通常情况下，代码签名证书能够同时为多种平台软件提供数字签名，包括微软代码签名、Android代码签名、Office和VBA 代码签名、Java代码签名等。 EV代码签名还能够支持Microsoft SmartScreen和驱动程序等。 没有进行代码签名的软件在安装时，操作系统会弹出软件不安全的提示从而导致低的产品可信度。
代码签名 (Code Signing) 证书用于对代码 / 程序签名，使您发布的程序受操作系统或应用平台的信任从而在用户执行时不会抛出警告。同时，代码签名证书可以保证文件的完整性，从而防止被恶意篡改。代码签名包含Extended Validation (EV) 证书适配Windows 10的Smart Screen筛选器。
Certificates for trusted PDF signature (AATL) are used to sign documents in Adobe Reader. A trusted PDF signature requires a special type of certificate. A signature made with an AATL certificate is fully trusted in Adobe Acrobat.
The Adobe Approved Trust List is a program that allows millions of users around the world to create digital signatures that are trusted whenever the signed document is opened in Adobe® Acrobat® or Reader® software. Essentially, both Acrobat and Reader have been programmed to reach out to a web page to periodically download a list of trusted "root" digital certificates. Any digital signature created with a credential that can trace a relationship ("chain") back to the high-assurance, trustworthy certificates on this list is trusted by Acrobat and Reader (source: Adobe.com).
A document’s electronic signature proves its origin and integrity from the moment it has been signed.
Using AATL certificates are directly required by Adobe for trusted PDF document signing (Adobe has special issuing requirements, see below). If you use a different signature, it will not be trusted in this program and the reader will receive an error. You can sign documents directly in Adobe Reader (no special software us required) by using an AATL electronic signature certificate (which must be stored on HW token).
Adobe has special requirements on electronic signature certificates. They must be stored on a secure device, so they are issued exclusively on a token or smart card. To obtain a certificate, you must complete the form, send it to the CA and sign it with the CA representative (eg during a video call). An alternative is a document certified by a notary, which is sent by the certification authority to the certificate’s applicant.
The screenshot below shows an example of signing an office document.
You can immediately send the newly signed document to the recipient who will know who it was from and that document has not been changed since it was signed.
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