A method performed at a first electronic device includes: (i) storing a privacy table that comprises random numbers at the first electronic device, (ii) transmitting the privacy table to a second electronic device over an encrypted channel, (iii) receiving a first message for transmission to the second electronic device, (iv) generating a map based on the privacy table, (v) generating a primary key based on the map and the privacy table, and (vi) encrypting the first message using the primary key to form an encrypted first message. The method also includes (vii) transmitting the map and the encrypted first message to the second electronic device, thereby enabling the second electronic device to decrypt the encrypted first message by recreating the primary key based on the map and the privacy table and decrypting the encrypted first message using the recreated primary key.