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 and systems for downloading applications to a mobile communicator and for protecting access to stored mobile applications are disclosed.

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: 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: 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 and system are provided such that a Client device can send a synchronization signal to a Server device, and the Server can make the necessary adjustments to maintain the two devices plesiochronous. Further, the server is provided with the capabilities to calculate the Client time. That is, the server is configured to perform the necessary steps, as per the methods of this invention, in order to be able to compute the Client's CTClient at any given opportunity. The system and methods that are provided allow the Server to distinguish between one particular client True-Client and a different entity pretending to be such client False-Client. The identification may be dynamic in order to avoid the possibility of impersonation of the True-Client by an eavesdropper.

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.

Abstract: A mobile communicator including a CPU, communications software and application software for at least one application which can be launched only by using at least one application key, the at least one application key being scrambled using a scrambling function which is based on a seed, which seed is not stored in any computer memory used by the mobile communicator.

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: 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: Payment systems are provided that utilize a portable device, and in particular, payment systems that utilize a first portable device that belongs to a seller and a second portable device that belongs to a buyer, but do not utilize a point of sale (POS) 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.