Patent ID: 8347398

Claim:
Keyboard data entry obfuscation method, comprising: keyboarding entry of a mixed-content document to produce an aggregate signal combination of private text characters and public text characters to yield a keyboard data signal; intersituating an encryptor apparatus in the keyboard data signal path connecting between the entry keyboard and a keyboard input port of a computer system; determining an encryption key that is maintained separate from the computer system; operating the encryptor apparatus in combination with the encryption key; enabling a user to select and cloak the private text character signal content of the aggregate signal combination with surrogate characters selected from an ostensibly random criterion array of keyboard enterable characters; and, connecting the combined signal aggregation of the surrogate characters and the public text characters to the keyboard input port of the computer system as a protected document data signal; whereby the private text characters selected by the user are cloaked with surrogate characters determined by the encryption key before the keyboard data signal is connected into the keyboard input port on the computer system.