Abstract: A communication server, interacting with an organization system having users that wish to communicate securely, provides secure communication capability to the users, without the communication server itself having access to unencrypted content of the user communications or to cryptographic keys that would allow the communication server to derive the unencrypted content. Thus, the communication server that provides the secure communication capability need not itself be trusted by the users with access to communicated content. To achieve this, the various entities communicate to exchange cryptographic keys in such a manner that the communication server never obtains usable copies of the cryptographic keys.

Abstract: A secure storage module of a client device interacts with a set of secure storage servers to securely store data items of the client on the servers, such that no individual server has the data in readable (non-obfuscated) form. Additionally, the client secure storage module and the servers interact to allow the client device to read a given portion of the original data items from the servers, such that none of the servers can determine which portion of the original data is being requested. Similarly, the interactions of the client secure storage module and the servers allows the client device to update a given portion of the original data on the servers to a new value, such that none of the servers can determine which portion is being updated and that none of the servers can determine either the prior value or new value or the difference between the new value and the prior value.

Abstract: Systems and methods are described for providing instant voice communications to users of a chat platform. An example method includes: providing a chat platform for a plurality of users, the chat platform including a plurality of chatrooms; presenting, on a client device of a first user from the plurality of users, a graphical user interface corresponding to a first chatroom from the plurality of chatrooms, the graphical user interface including a selectable element for initiating an instant voice communication channel among members of the chatroom, the members including the first user and at least one other user from the plurality of users; receiving, on the client device of the first user, an indication that the user has selected the selectable element in the graphical user interface; and providing, in response to the selection, the instant voice communication channel to client devices associated with the members.

Abstract: A communication server, interacting with an organization system having users that wish to communicate securely, provides secure communication capability to the users, without the communication server itself having access to unencrypted content of the user communications or to cryptographic keys that would allow the communication server to derive the unencrypted content. Thus, the communication server that provides the secure communication capability need not itself be trusted by the users with access to communicated content. To achieve this, the various entities communicate to exchange cryptographic keys in such a manner that the communication server never obtains usable copies of the cryptographic keys.

Abstract: A sharing client device shares content with viewing client devices. A sharing module operating on a sharing client device and on the viewing client devices facilitates the creation and analysis of viewer snapshots, permitting automatic determination of whether viewers are up-to-date with their display of shared content. Based on the analysis and on a policy of the sharing module, the sharing module can take a number of actions, such as generating and displaying a viewer summary that a user of the sharing client device may view to determine whether, or to what extent, the viewing client devices are up-to-date in their displays of the shared content.

Abstract: A secure storage module of a client device interacts with a set of secure storage servers to securely store data items of the client on the servers, such that no individual server has the data in readable (non-obfuscated) form. Additionally, the client secure storage module and the servers interact to allow the client device to read a given portion of the original data items from the servers, such that none of the servers can determine which portion of the original data is being requested. Similarly, the interactions of the client secure storage module and the servers allows the client device to update a given portion of the original data on the servers to a new value, such that none of the servers can determine which portion is being updated and that none of the servers can determine either the prior value or new value or the difference between the new value and the prior value.

Abstract: A sharing client device shares content with viewing client devices. A sharing module operating on a sharing client device and on the viewing client devices facilitates the creation and analysis of viewer snapshots, permitting automatic determination of whether viewers are up-to-date with their display of shared content. Based on the analysis and on a policy of the sharing module, the sharing module can take a number of actions, such as generating and displaying a viewer summary that a user of the sharing client device may view to determine whether, or to what extent, the viewing client devices are up-to-date in their displays of the shared content.

Abstract: An organization that wishes its messages to be secure (the “communicating organization”) uses services of a secure communications infrastructure to securely exchange communications among its users. The secure communications infrastructure allows granting to third-party applications the permission to act on behalf of the users when using the secure communications infrastructure. This delegation may be accomplished at a very granular level, specifying the particular applications that are authorized to act on behalf of a user, the particular operations that those applications are authorized to perform, and/or in which contexts the applications may perform the operations. An agent component acts as an intermediary between third-party applications and the core of the secure communications infrastructure. This permits the third-party application to take actions on behalf of the user, while also preventing the third-party applications from obtaining the security-specific data that could lead to a breach of security.

Abstract: A communication server, interacting with an organization system having users that wish to communicate securely, provides secure communication capability to the users, without the communication server itself having access to unencrypted content of the user communications or to cryptographic keys that would allow the communication server to derive the unencrypted content. Thus, the communication server that provides the secure communication capability need not itself be trusted by the users with access to communicated content. To achieve this, the various entities communicate to exchange cryptographic keys in such a manner that the communication server never obtains usable copies of the cryptographic keys.

Abstract: A secure storage module of a client device interacts with a set of secure storage servers to securely store data items of the client on the servers, such that no individual server has the data in readable (non-obfuscated) form. Additionally, the client secure storage module and the servers interact to allow the client device to read a given portion of the original data items from the servers, such that none of the servers can determine which portion of the original data is being requested. Similarly, the interactions of the client secure storage module and the servers allows the client device to update a given portion of the original data on the servers to a new value, such that none of the servers can determine which portion is being updated and that none of the servers can determine either the prior value or new value or the difference between the new value and the prior value.

Abstract: A communication server, interacting with an organization system having users that wish to communicate securely, provides secure communication capability to the users, without the communication server itself having access to unencrypted content of the user communications or to cryptographic keys that would allow the communication server to derive the unencrypted content. Thus, the communication server that provides the secure communication capability need not itself be trusted by the users with access to communicated content. To achieve this, the various entities communicate to exchange cryptographic keys in such a manner that the communication server never obtains usable copies of the cryptographic keys.

Abstract: A communication server, interacting with an organization system having users that wish to communicate securely, provides secure communication capability to the users, without the communication server itself having access to unencrypted content of the user communications or to cryptographic keys that would allow the communication server to derive the unencrypted content. Thus, the communication server that provides the secure communication capability need not itself be trusted by the users with access to communicated content. To achieve this, the various entities communicate to exchange cryptographic keys in such a manner that the communication server never obtains usable copies of the cryptographic keys.