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 sending device communicatively coupled to said message device, said sending device comprising:
a messaging application configured to:
receive user input identifying a message;determine at least one of language, idiom, and regionalism in said message, wherein said regionalism is a linguistic feature peculiar to a particular region;receive user input specifying a recipient address for said message; andretrieve 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 and information indicating said language, idiom, or regionalism of said encrypted message to said message device;said message device configured to:
determine at least one of language, idiom, and regionalism that varies from said language, idiom, or regionalism of said encrypted message indicated by said information; use said recipient address specified by said messaging application, and context data from said recipient address context data table associated with said recipient address, and information indicating said language, idiom, or regionalism to generate a notification message, said notification message devoid of explicit reference to said encrypted message, including but not limited to the at least one of language, idiom, and regionalism that varies from said language, idiom, or regionalism of said encrypted message indicated by said information as determined from at least one of said language, idiom, and regionalism of said encrypted message, and indicative of availability of said encrypted message; and initiate delivery of said notification message to said recipient address as an indicator of availability of said encrypted message.