Who is Tokugen Numataka from Digital Fortress and what is their importance?

Numataka is a Japanese businessman, and the owner of Numatech, Inc., a Japanese software company. He is the highest bidder in the auction for the Digital Fortress passkey, and he becomes intrigued by an anonymous caller, who claims to be Tankado's silent partner. This caller offers to sell Numataka both passkeys for the price he has bid for one.