Authentication system

1. An authentication system, comprising:

a host authenticating device;

a portable authenticated unit connectable to the host authenticating device;

the host authenticating device having:

a random number generation device configured to generate a random number;

a function determination signal generation device configured to generate a function determination signal for determining a function form, the authenticating device being configured to store the random number and the function determination signal; and

a signal combining device configured to combine the function determination signal and the random number into a combined signal and transmit the combined signal to the authenticated unit;

the portable authenticated unit having:

a signal separation device configured to receive the combined signal and to separate the received combined signal into the function determination signal and the random number;

a second function calculation device configured to calculate a function of the random number as a second calculation result using a determined function form determined by the function determination signal and configured to transmit the second calculation result back to the authenticating device; and

a battery pack which provides power to the signal separation device and second function calculation device;

the host authenticating device having:

an inverse-function calculation device configured receive the second calculation result and to calculate an inverse function of the received second calculation result using a function form determined by the stored function determination signal;

a comparison device configured to compare the stored random number with the inverse function calculation result; and

a connecting device configured to effect a function connection of the authenticated unit to the authenticating device if it is detected that the stored random number equals the inverse function calculation result, and to reject the function connection of the authenticated unit to the authenticating device if it is detected that the stored random number does not equal the inverse function calculation result.

2. The authentication system of claim 1 , wherein said connecting device is configured to effect a function power signal connection between the portable authenticated unit and the host authenticating device if it is detected that the stored random number equals the inverse function calculation result, and to reject the function power signal connection of the portable authenticated unit to the host authenticating device if it is detected that the stored random number does not equal the inverse function calculation result.

3. A battery pack authentication system for a computer, comprising a portable authenticated battery pack unit and a host authenticating device;

wherein upon successful authentication of the portable authenticated battery pack unit by the host authenticating device, a power connection is enabled between the portable authenticated battery pack unit and the host authenticating device for powering the computer in the absence of an AC adapter power input and for recharging the portable authenticated battery pack unit in the presence of said AC adapter power input;

wherein the portable authenticated battery pack unit comprises a battery pack to be authenticated, a signal separation device, and a second function calculation device, the signal separation device and the second function calculation device being powered by said battery pack during authentication of the portable authenticated battery pack unit;

wherein the host authenticating device is part of the computer and comprises an input for receiving said AC adapter power input, a random number generation device, a function determination signal generation device, a signal combining device, an inverse-function calculation device, a comparison device, and a connecting device;

wherein the random number generation device is configured to generate a random number;

wherein the function determination signal generation device is configured to generate a function determination signal for determining a function form, the host authenticating device being configured to store the random number and the function determination signal;

wherein the signal combining device is configured to combine the function determination signal and the random number into a combined signal and transmit the combined signal to the portable authenticated battery pack unit;

wherein the signal separation device is configured to receive the combined signal and to separate the received combined signal into the function determination signal and the random number;

wherein the second function calculation device is configured to calculate a function of the random number as a second calculation result using a determined function form determined by the function determination signal and configured to transmit the second calculation result back to the host authenticating device; and

wherein the inverse-function calculation device is configured to receive the second calculation result and to calculate an inverse function of the received second calculation result using a function form determined by the stored function determination signal;

wherein the comparison device is configured to compare the stored random number with the inverse function calculation result; and

wherein the connecting device is configured to enable said power connection between the portable authenticated battery pack unit and the host authenticating device if it is detected that the stored random number equals the inverse function calculation result, and to disable said power connection if it is detected that the stored random number does not equal the inverse function calculation result.