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According to [12] AOL uses RSA Security’s SecurID hardware token. In order to log in, users have to type in a 6-digit-Code displayed by the token and changed every minute, in addition to their regular password. – A one-time-password token provided by Kobil Systems does not change the passwords periodically but on user request. Every time the user needs a password he has to push a button on the token [13]. – A third method is used by the Swedish SEB-bank. It uses a token-based challenge-response-system [14].

The Anti-Phishing Working Group (APWG), an association of financial institutions, internet service providers, online-retailers, and other it-companies, is collecting information on Phishing incidents. The collected data is published in the monthly Phishing Activity Trends Report, which clearly shows the dramatical increase in Phishing attacks during the last few months (see Fig. 1). Another study conducted by Gartner showed that 57 million US citizens have already been victims of a Phishing attack.

Pn must set some parameters. They choose a large prime p so that p = 2q + 1 and q is also prime; they also pick one element g ∈ Z∗p of order q. Using the key generation protocol described in [6], players jointly generate a public key y = ni=1 yi . Each player Pi keeps her corresponding share αi of the private key and publishes yi = g αi . 2 Deck Generation Each card is represented by a value jointly computed by all players in Protocol 1. We first explain what Protocol 1 does and then describe the protocol in detail.

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