The real objective of computer security is to protect theft or destruction of information and property stored in the computer systems, so that it remains properly accessible and useful for its final users. Computer security can be achieved by following a few steps that are mostly centered around following a strict security policy that does not take into account the software used; or follow a security policy that has mechanisms that can’t be trusted; or adopting a security policy and software validated by trail and error; or just follow a security policy with trustworthy mechanisms. While the former 2 can be considered as approach affected by computer insecurity, the latter 2 can be considered as approach affected by computer security. While the first 2 approaches are impractical, of the next 2 approaches the 3rd one is expensive which leaves only the 4th approach as practical easy to adopt.
Some other approaches include restricted access, thereby even if a cyber attack happens the restricted access does not allow the attacker to get into other sections. Also partitioning the system into smaller components, opens up the possibility to use a variety of techniques to prove correctness of subsystems. Computer security is centered around CIA short for Confidentiality, Integrity, and Authentication. Confidentiality refers to the information that is private and cannot be access by all; Integrity refers to protecting the information against unauthorized changes that go undetected by authorized users; Authentication refers to access to the genuine users.
Read the rest of this entry »
Twitter, a social networking and micro-blogging service established in 2006 allows its users to send and read messages known as tweets. Tweets are nothing but posts up to 140 characters that can be displayed on the author's profile page and delivered to the author's subscribers/followers. However to avoid unnecessary attention senders can restrict delivery of these tweets to a select few in their circle of friends or, by default allow everyone open access. Users can also follow a lists of authors instead of individual authors. The biggest advantage of Twitter is that users can send and receive tweets not just via the Twitter website, Short Message Service (SMS) but also through external applications such as phones. While Twitter is free of cost, accessing it through SMS may result in fee from the phone service provider.
The website with more than 100 million users worldwide has still not made profit but after the end of 2010 financial year is expected to make profits in the range of over a billion dollars progressively. Sometimes called the "SMS of the Internet" has emerged as one of the most popular social networking/ blogging platforms. Its simplistic concept allows famous personalities, (most famous celebrities such Brittany Spears, Lindsay Lohan, Amitabh Bachchan, Ajay Devgn, Priyanka Chopra, Sachin Tendulkar, Sanjeev Kapoor are users of Twitter) to send brief messages about what they are doing to their loyal followers so as to clear the air of any ambiguity/controversy about them. Twitter as such can be helpful to not just famous personalities to communicate but also with large corporations and small businesses. Read the rest of this entry »
