Abstract: An authentication system is provided that includes a portable device and a decryption node. An individual uses the portable device, such as a portable device like a cell phone to compute a challenge and a response. The challenge and response is sent to a decryption node. In response, the decryption node computes a presumed response and compares the presumed response to the response of the portable device, in order to authenticate the individual associated with the portable device.

Abstract: Systems and methods for improving the restrictiveness on accessing software applications on mobile devices, such as cell phones, are disclosed. In accordance with an exemplary embodiment, a computer-implemented system and method for improving the restrictiveness on accessing software applications comprises using a device having a memory, wherein the software application is stored in the memory and requesting, from the user, an original PIN, wherein the original PIN is not stored in the memory and any information about the original PIN is not stored in the memory. The invention further comprises using the original PIN as a seed number to create a true encryption key, using the true encryption key to encrypt an application secret data into a ciphertext and storing, in the memory, the ciphertext.

Abstract: An authentication system is provided that includes a portable device and a decryption node. An individual uses the portable device, such as a portable device like a cell phone to compute a challenge and a response. The challenge and response is sent to a decryption node. In response, the decryption node computes a presumed response and compares the presumed response to the response of the portable device, in order to authenticate the individual associated with the portable device.

Abstract: Methods for the authentication of a web site by a visitor to the web site. The visitor uses a device, such as a portable device like a cell phone to compute a dynamic identification string and a one-time password. The dynamic identification string is sent to a service provider, such as a certification service server associated with the web site. In response, the server computes a one-time password that is transmitted to the visitor's device. The device computed one-time password can then be compared to the server computed one-time password in order to authenticate the web site.