The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2010
Filed:
Jan. 02, 2004
Hsiang-tsung Kung, Lexington, MA (US);
Hsiang-Tsung Kung, Lexington, MA (US);
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
The present invention provides a flexible, tamper-resistant authentication system, or personal authentication device (PAD), which can support applications in authentication, authorization and accounting. The PAD stores at least one public key associated with a certificate authority (CA) and receives one or more digital certificates, which may be authenticated based on the stored CA public keys. The PAD outputs a service key that, depending on the application, may be used to gain access to a controlled space, obtain permission for taking a certain action, or receive some service. The operation of the PAD and the nature of the service key may be determined by digital certificates that it receives during operation. Using a stored PAD private key that is kept secret, the PAD may perform a variety of security-related tasks, including authenticating itself to a user, signing service keys that it generates, and decrypting content on received digital certificates.