Confidential message exchange using benign, context-aware cover message generation

摘要

Systems and methods are disclosed permitting a sender to send a secret and secure message to a recipient. An application on a sender device interfaces with known message generating tools to permit a user to generate a message. The local application encrypts the message (and optional attachments) based on public/private key pairing negotiated with the server given the recipient device id. The sender device transmits the cipher text to the server. The server generates a benign, text-based, context-appropriate message and delivers same to a recipient device by way of a known messaging service. The benign message provides a secret clue to the recipient that an encrypted message is available. Recipient may then access and decrypt the encrypted message, such as from the server in response to a successful challenge (e.g., password request).

主权项

1. A system providing secret and secure electronic messaging delivery, comprising:
a message device comprising a recipient address key table and a recipient address context data table; a receiving device communicatively coupled to said message device; a sending device communicatively coupled to said message device, said sending device comprising: a message application configured to: enable selection of a message; enable specifying a recipient address for said message; and retrieve from said recipient address key table an encryption key corresponding to said recipient address; an encryption engine configured to encrypt said message using said encryption key associated with said recipient address; and an interface to deliver said encrypted message associated with said recipient address to said message device; said message device configured to: use said recipient address specified by said messaging application and context data from said recipient address context data table associated with said recipient address to generate a benign, contextually appropriate message, said benign, contextually appropriate message devoid of explicit reference to said encrypted message, but said benign, contextually appropriate message serving as an indicator of the availability of said encrypted message; post said encrypted message to a messaging portion of said message device; initiate delivery of said benign, contextually appropriate message to said recipient address as an indicator of the availability of said encrypted message; said receiving device configured to: receive said benign, contextually appropriate message and determine whether said benign, contextually appropriate message indicates said encrypted message is available for retrieval from said message device; and responsive to determining that said encrypted message is available for retrieval from said message device, retrieve said encrypted message from said message device; wherein said message device is configured such that said encrypted message is accessible on said message device only during a predefined lifespan of said encrypted message.