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1. (WO2018129108) PARTIALLY ENCRYPTED CONVERSATIONS VIA KEYS ON MEMBER CHANGE

Pub. No.:    WO/2018/129108    International Application No.:    PCT/US2018/012276
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Fri Jan 05 00:59:59 CET 2018
IPC: H04L 9/14
Applicants: MICROSOFT TECHNOLOGY LICENSING, LLC
Inventors: MULLINS, Christopher L.
STANDEFER, Robert, III
Title: PARTIALLY ENCRYPTED CONVERSATIONS VIA KEYS ON MEMBER CHANGE
Abstract:
Examples of the present disclosure describe systems and methods for partially encrypting conversations using different cryptographic keys. Messages communicated during a conversation session may be encrypted using a cryptographic key. Other conversation participants may then decrypt the messages using the cryptographic key. During the conversation, an event may occur that causes a new cryptographic key to be generated. The conversation participants may then use the new cryptographic key when communicating. As such, previously-encrypted messages may be inaccessible to new members that do not have the old cryptographic key, while newly-encrypted messages may be inaccessible to former members that do not have the new cryptographic key. An isolated collection may store the messages and related cryptographic keys. Relationships may exist within the isolated collection, such that messages may be related to one another and messages may also be related to the cryptographic keys used to encrypt them.