Abstract: Systems and methods for non-deterministic multi-party, multi-user sender-receiver authentication and non-repudiated resilient authorized access to secret data are described herein. In one aspect, a method for data access includes receiving, at a server, a request for data access from a user; transmitting to users, a prompt for identity verification corresponding to the identity of each user, where at least one of user is different than the user requesting data access; receiving, in response to the identity verification prompt, a plurality of identification key fragments from storage locations or devices associated with the users, where each identification key fragment is user specific; generating an organization-specific data object from the plurality of identification key fragments; confirming the organization-specific data object by the users whose identities were validated; and authorizing the request for data access based on confirming the organization-specific data object.