Abstract: The present invention provides a method of distributing a new group key by a designated group key server, comprising: receiving a group key by a wireless device from each of a newly discovered neighbor. The next step is to receive a list of devices that the newly discovered neighbor connects to. Then, the device determines whether or not the received group key is the same with a new group key and a key index from a neighbor Ni and to associate each the group key with the list of device received from the same neighbor. The device compares all the group keys from the each neighbor and merging an associated lists of device into a single list if the group keys are the same. Subsequently, the device selects the group key with the largest associated list of device be a new selected group key.

Abstract: A multi-stage email interception method. First, an email message is received. Then, the receiving number corresponding to the email message is queried from an array according to the related information of the email message. The email message is rejected if the receiving number is higher than a first setting value and the email message conforms to the email characteristics recorded in a specific email record; the email message is accepted first and then deleted if the receiving number is higher than a second setting value and the email address of the recipient of the email message does not appear in the recipient field of the email message; and the email message is accepted and forwarded to a specific mailbox if the receiving number is lower than the second setting value and more than a third setting value and the email address of the recipient of the email message does not appear in the recipient field of the email message.

Abstract: A network hub which allows the transmission of data at varying data transfer rates. Data is divided into different transfer protocols and converted by an exchange unit to transform the data of different groups into appropriate speed networks.

Abstract: A relay control circuit regulates the Set and Reset states of a pair of latch-type relays utilizing only a relatively weak carrier signal. Each relay is controlled by a circuit including a programmable unijunction transistor that is triggered by the discharge of a storage capacitor to enable its respective relay to enter the set state. The carrier signal itself regulates the charging and discharging of the circuit capacitors, thus regulating the Set and Reset states of the respective relays.