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Secure XML: The New Syntax for Signatures and Encryption by Kitty Niles, Donald E. Eastlake

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18.2. Key Agreement Algorithms

A key agreement algorithm provides a secret quantity shared between the sender and the recipient based on certain types of compatible public keys from both parties. An optional OriginatorKeyInfo parameter child of an AgreementMethod element indicates the information associated with the originator used to determine the key. An optional RecipientKeyInfo child indicates that associated with the recipient.

XML Encryption key agreement algorithms do not provide an online key agreement negotiation protocol. The originator uses the AgreementMethod element to identify the keys and the computational procedure they used to ...

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