RSA Security has developed a SecurID Software Token that delivers two-factor user authentication through NTT DoCoMo’s i-appli compatible phones based on i-mode. The tokens can be used to authenticate users and help protect valuable online information resources. A two-factor authentication process requires users to identify themselves with two unique factors — something they know and something they have — before they are granted access. RSA SecurID authenticators come in a variety of form factors including hardware tokens, smart cards and software tokens. NTT DoCoMo currently has 36 million i-mode subscribers.
http://www.rsasecurity.com