Although XML Encryption can be used to encrypt any kind of data, it is nonetheless known as "XML Encryption" because an XML element (either an EncryptedData or EncryptedKey element) contains or refers to the cipher text, keying information, and algorithms.
Both XML Signature and XML Encryption use the KeyInfo element, which appears as the child of a SignedInfo, EncryptedData, or EncryptedKey element and provides information to a recipient about what keying material to use in validating a signature or decrypting encrypted data.
The KeyInfo element is optional: it can be attached in the message, or be delivered through a secure channel.
XML Encryption is different from and unrelated to Transport Layer Security, which is used to send encrypted messages (including xml content, both encrypted and otherwise) over the internet.
- W3C info
- Apache Santuario - Apache XML Security Implementation for Java and C++
- XMLSec - XML Security Library for C
- An Introduction to XML Signature and XML Encryption with XMLSec
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