A technique, and system implementing the technique, allow an encrypted message to be sent directly to a recipient, and when the recipient opens the message, the recipient’s system sends a request to an arbiter server to retrieve decryption information to decrypt the message. According to an aspect of the invention, a method and apparatus for developing an electrostatic image are provided implementing a drum photoconductor and a magnetic brush contacting the drum photoconductor. A magnetic hinge assembly can include magnets configured to correlate with the first and second magnets. When the table is elevated, the seat is also elevated and forward inclined for the user sit thereon to lean against the table without the risk of falling off the seat. Further, in the aspect of active point, the size of a transistor may be adjusted for variable control, and hence levels determined among modulation signals may be reduced to lower the complexity of voltage regulator in design.