Abstract: In a file sharing system, a key manager unit realizes a correspondence between the first user identifier and the first public key in response to a registration request of the first user, generates a first key material for encrypting the first file into a first encrypted file, and generates a first credential according to the first user identifier, the first file identifier, the first public key and the first key material after receiving an access-right claim request to the first file from the first user. A file storage unit stores the first encrypted file and the first credential. The first user uses the first user identifier, the first file identifier and the first private key to retrieve the first key material out of the first credential, and uses the first key material to decrypt the first encrypted file into the first file.

Abstract: A first user device has first public and private keys and a file encryption key for encrypting the specified file into an encrypted file. A second user device has second public and private keys. A server is in communication with the first and second user devices. The first user device generates temporary public and private keys, performs a first key establishment with the second public key, first private key and temporary private key to generate a shared secret, and uses the shared secret to encrypt the file encryption key into an encrypted key.

Abstract: An integrated circuit module functioning for information security includes: a secure circuit unit, which has passed a security evaluation as a cryptographic module and stores therein at least one digital key for providing a digital key service; and a controller unit set which is in communication with the secure circuit unit and includes a fast service unit and a trusted zone unit. The trusted zone unit and the secure circuit unit respectively use a first channel establishment key and a second channel establishment key dependent on each other to establish a secure signal channel. The secure circuit unit transmits a specific data to the fast service unit via the security signal channel to perform a fast service.

Abstract: The invention provides an accurate, effective, and efficient system for content based charging, access barring, and network browsing, for pre-paid and post-paid subscribers of a wireless mobile communication network system comprising a gateway general packet radio service support node with service based content charge module; a separate WAP gateway for post-paid and pre-paid subscribers; IP, domain name and URL white list filtering; call detail records; a mediation gateway; data warehouse; and billing system. Access to the internet or free domain networks are efficiently controlled and content charges are accurately billed for both pre-paid and post-paid subscribers.

Abstract: The invention provides an accurate, effective, and efficient system for content based charging, access barring, and network browsing, for pre-paid and post-paid subscribers of a wireless mobile communication network system comprising a gateway general packet radio service support node with service based content charge module; a separate WAP gateway for post-paid and pre-paid subscribers; IP, domain name and URL white list filtering; call detail records; a mediation gateway; data warehouse; and billing system. Access to the internet or free domain networks are efficiently controlled and content charges are accurately billed for both pre-paid and post-paid subscribers.

Abstract: A method of brokering networks and network services between network companies and virtual network operators in order to leverage the assets of both organizations and facilitate cooperation between the organizations to provide improved network services to subscribers. A network broker mediates between network companies who provide the physical network, and virtual network operators who provide the content and program applications. The network broker can switch between network companies depending upon issues such as cost and can negotiate better rates based on total traffic of a plurality of virtual network operators. The switching can be transparent to the virtual network operators. The network broker can negotiate better rates by combining the total usage of all the virtual network operators.

Abstract: A network and network services brokering system between network companies and mobile virtual network operators which provides efficient billing systems in order to provide improved network services to subscribers. The network brokering system comprises a virtual network operator who provides network services to subscribers, a network company who provides usage of their physical networks to the virtual network operator, and a network broker who interfaces between the network company and virtual network operator. Additionally, the network broker provides interfacing between virtual network operators and independent content providers. The network broker further comprises a real-time call control and common service platform for real-time controlling of call, billing, and payment information. Using the real-time call control and common service platform allows complex billing such as partial pre-paid and partial post-paid payment schemes.