	US 7,580,980 B2
	Email system restoring recipient identifier based on identifier-for-disclosure for establishing communication between sender and recipient
Masahisa Kawashima, Tokyo (Japan); Fumitaka Hoshino, Tokyo (Japan); Akiko Fujimura, Tokyo (Japan); Shingo Kinoshita, Tokyo (Japan); Masayoshi Nakao, Tokyo (Japan); Noriaki Saito, Tokyo (Japan); Yukio Tsuruoka, Tokyo (Japan); Katsumi Takahashi, Tokyo (Japan); Tsuyoshi Abe, Tokyo (Japan); and Jun Miyake, Tokyo (Japan)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (Japan)
Appl. No. 10/538,855 PCT Filed Dec. 19, 2003, PCT No. PCT/JP03/16396 § 371(c)(1), (2), (4) Date Dec. 12, 2005, PCT Pub. No. WO2004/057480, PCT Pub. Date Jul. 08, 2004.
Claims priority of application No. 2002-369799 (JP), filed on Dec. 20, 2002; application No. 2003-25976 (JP), filed on Feb. 03, 2003; application No. 2003-352130 (JP), filed on Oct. 10, 2003; and application No. 2003-352131 (JP), filed on Oct. 10, 2003.
Prior Publication US 2006/0129629 A1, Jun. 15, 2006
Int. Cl. G06F 15/16 (2006.01)

U.S. Cl. 709—206 [709/207; 713/189; 713/150]

56 Claims

1. A method of performing a communication between a sender terminal and a recipient terminal in response to a communication request from the sender terminal using a recipient identifier for uniquely specifying a recipient, the method comprising:

creating an identifier-for-disclosure based on communication condition information for informing communication conditions to a recipient at a time of performing the communication and the recipient identifier;

restoring, when a communication request from the sender terminal based on the identifier-for-disclosure created is received, the recipient identifier and the communication condition information from the identifier-for-disclosure; and

establishing, when the communication conditions included in the communication condition information restored are satisfied, the communication between the sender terminal and the recipient terminal according to the communication request.