Systems and methods for securely providing metadata for decrypting content history of an encrypted session

A system for inviting a member to an end-to-end encrypted session, the system comprising:

• a controller with one or more hardware processors configured to:
• receive a request to add the member to the end-to-end encrypted session;
• determine that the member is offline and not connected to the end-to-end encrypted session at a first time associated with the request to add the member;
• generate an invitation that encrypts a session key;
• store the invitation in a repository;
• and
• distribute the invitation from the repository to the member in response to the member coming online at a second time.

A non-transitory computer-readable medium storing program instructions that, when executed by one or more hardware processors of an end-to-end encrypted communication system, cause the end-to-end encrypted communication system to perform operations comprising:

• receiving a request to add a member to an end-to-end encrypted session;
• determining that the member is offline and not connected to the end-to-end encrypted session at a first time associated with the request to add the member;
• generating an invitation that encrypts a session key;
• storing the invitation in a repository;
• and
• distributing the invitation from the repository to the member in response to the member coming online at a second time.