Patent ID: 8370630
Filing Date: 2013-02-05
Classification: H04L

Abstract:
1. A client apparatus connected to a network and including an existing mailer carrying out e-mail communication between a plurality of client apparatuses, comprising: a transmission control protocol 2 (TCP2) driver including a TCP2 core and a mail system core; and a TCP2 mail system application unit other than said existing mailer, including means for recognizing a packet of the e-mail transmitted from one of the existing mailer and SMTP or POP3 protocols and for transmitting the packet to said mail system core, the TCP2 mail system application unit and the TCP2 driver providing transport layer encryption and decryption of e-mail packets, wherein said mail system core includes means for encrypting or decrypting the e-mail transmitted and received, means for carrying out key exchange with other client apparatuses, means for saving IP address and port of said POP3 and IP address and port of said SMTP, means for saving user ID and password, and e-mail addresses of a sender and a receiver, means for saving a key formed by said key exchange, and means for selecting and deleting an encrypted mail, an HTML mail or an attached file, said TCP2 mail application unit includes means for carrying out a display of a key status in connection with the e-mail transmitted from said mail system core and for carrying out a list display of a status of encryption or non-encryption of the e-mail, an mail address of the sender, mail type and attached file, and means for displaying the encrypted mail received by said existing mailer in plaintext, the e-mail received via said network is selected and processed by said TCP2 driver and thereafter is supplied to said existing mailer, and the e-mail transmitted to the other client apparatuses from said existing mailer through said network is set to be transmitted after the other client apparatus of the receiver is confirmed by said TCP2 driver.