IWSEC 2013 will be held at Okinawaken Shichouson Jichikaikan (Naha City, Okinawa), Japan (access map, floor guide). More detailed information will be available at this page.

Hotel Accommodation

For the hotel accommodation during the conference, Hotel Tokyu Bizfort Naha, is next door to the conference center where IWSEC2013 will be held.
http://www.tokyuhotelsjapan.com/en/TB/TB_NAHA/index.html

When you make a reservation, please inquire the hotel about discount that they give the participants of IWSEC 2013. You must tell them that you are an attendee of a conference held in Jichikaikan Hall. When you make a reservation through contact form, be sure o select "Hotel Tokyu Bizfort Naha" from the pull-down menu.
https://www.tokyuhotels.co.jp/en/cgi/contact/mail.cgi

Reservation form in Japanese
https://www.tokyuhotels.co.jp/ja/cgi/contact/mail.cgi/TB_NAHA