Abstract: A slurry composition for a chemical mechanical polishing (CMP) process includes about 0.1% by weight to about 10% by weight of polishing particles, about 0.001% by weight to about 1% by weight of an amine compound, about 0.001% by weight to about 1% by weight of a first cationic compound that is amino acid, about 0.001% by weight to about 1% by weight of a second cationic compound that is organic acid, and about 1% by weight to about 5% by weight of polyhydric alcohol including at least two hydroxyl groups.

Abstract: A method of and an authentication server for distributing a key are disclosed. According to an embodiment of the present invention, the method of distributing a key, which is distributed by an authentication server connected with wireless terminals through a communication network, for encrypting and decrypting data in accordance with providing a service can include: obtaining characteristic information by decrypting encrypted characteristic information that has been received from each of n number of wireless terminals; generating a random key; generating a group key used for encrypting and decrypting data in accordance with providing a service; and generating a distribution key by using the random key, the group key and the characteristic information, and transmitting the distribution key to each wireless terminal.

Abstract: An electronic device and method for performing user authentication using at least one of an access point and a peripheral device are provided. The method includes determining whether an electronic device connects to at least one of a stored access point and a stored device within a predetermined time period; and requesting a predetermined user authentication when it is determined that the electronic device has not connected to the at least one of the stored access point and device within the predetermined time period.

Abstract: A method of and an authentication server for distributing a key are disclosed. According to an embodiment of the present invention, the method of distributing a key, which is distributed by an authentication server connected with wireless terminals through a communication network, for encrypting and decrypting data in accordance with providing a service can include: obtaining characteristic information by decrypting encrypted characteristic information that has been received from each of n number of wireless terminals; generating a random key; generating a group key used for encrypting and decrypting data in accordance with providing a service; and generating a distribution key by using the random key, the group key and the characteristic information, and transmitting the distribution key to each wireless terminal.