Abstract: A method (200) performed by a plurality of servers (108) to each provide a share (110) of a secret to an owner (102) of the secret is disclosed. The share of the secret (110) is generated using a cryptographic share generation method. The plurality of servers (108) each store a different share and an associated unique identifier indicative of the owner, the unique identifier having a corresponding verifier. Each of the plurality of servers receives a request (202) from a user (102) to provide the share stored by the server. The server identifies (204) the share stored by the server using a request identifier and further compares a request verifier to the verifier corresponding to the unique identifier associated with the stored share. If the request verifier suitably compares, the server authenticates (206) the user as the owner by providing the share (208) to the user.

Abstract: There are disclosed systems and methods for correlating a data collaboration session between at least two clients via a third client on a network. The method comprises providing a first, second and third client with a unique identifier and establishing a communication in an audio channel between the first and third clients The established communication in the audio channel is forwarded to the second client. The method further comprises signalling by the first client to the second client a request for a data collaboration session, responding to the signal by the first client by sending the unique identifier of the second client to the first client via the audio channel, associating the unique identifier of the second client with the communication and associating the identifier of the first client with the communication. The method further comprises transferring the associated identifiers of the first and second clients to a server configured for holding the data collaboration session.