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Accessing such sites should be safe, even if your wireless network connection is open, which is to say it isn t protected with either WEP or WPA Similarly, although online shopping sites might not use SSL while you re browsing, when it s time to pay, they always use SSL This ensures that your credit card details are encrypted If the store doesn t adopt an https:// address when you click to visit the virtual checkout, you shouldn t shop there! So do you even need WEP or WPA protection if you simply use your wireless connection to browse the Internet Yes In addition to the risk of unauthorized users hopping onto your connection if it isn t protected, some web mail services transfer your username and password in the clear, which is to say without using SSL This means your information could be picked up by an eavesdropper.

The security of SSH relies on the use of public/private key pairs. By default, the client tries to authenticate using RSA or DSA key pairs. To make this work, the server must have the client s public key, which is something that you have to configure by hand, as we ll see later. When the client has a public/private key pair, it generates an encrypted string with its private key. If the server is able to decrypt this string using the client s public key, the client s identity is authenticated. When using public/private key pairs, you can configure different things. First, the user needs to determine what cryptographic algorithm she wants to use. For this purpose, she can choose between RSA and DSA (between which DSA is considered stronger). Next, she has to decide if she wants to protect her private key with a passphrase. Using a passphrase is important because the private key really is used as the identity of the user. Should anyone steal this private key, it would be possible to forge the identity of the key s owner, and, for that reason, it s a very good idea to secure private keys with a passphrase.

In the case of Hotmail and Yahoo! Mail, you can select secure login, but it isn t activated by default Google Mail appears to use SSL all the time for login, but after this, your e-mail messages are transmitted across the Internet in the clear and, in theory, anyone can eavesdrop on them..

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Many countries now have widespread 3G cellular networks capable of delivering data at broadband speeds to mobile devices. Smartphones now come with 3G capability by default, with 3G USB adapters ( dongles ) to plug into your notebook now commonplace on pay-as-you-go or contract arrangements. Higher-end notebooks and Netbooks now come with mobile broadband adapters built as standard. Ubuntu offers excellent support for mobile broadband devices, whether you want to connect via a 3G USB adapter plugged into your notebook, an inbuilt 3G adapter, or your 3G-enabled cellphone connected ( tethered ) via USB cable. You can set up your mobile broadband device as follows: 1. Connect your 3G device (dongle or cellphone) to your notebook: A dongle connected via USB cable should be instantly recognized. Cellphones will generally need to be switched into modem mode, and you will need to consult your manufacturer s documentation for details. For example, when you plug a Nokia smartphone into a notebook, a dialog will appear on the phone giving you the option of switching to Mass Storage Mode or PC Suite Mode. Select the latter to make it act as a modem. If your notebook has a built-in 3G device, make sure it s switched on.

Basically, Secure Shell is a suite of tools that consists of three main programs and a daemon, sshd. Before being able to use it, of course, you have to install it using apt-get install openssh-server. The tools are ssh, scp, and sftp. The first, ssh, is used to establish a secured remote session. Let s say that it s like telnet but cryptographically secured. The second, scp, is a very useful command that s used to copy files to and from another server where the SSH process is running. The third, sftp, is a secure FTP client interface. Using it establishes a secured FTP session to a server that s running the sshd. Two of the best things of all of these tools are that they can be used without any preparation or setup, and you can set them up to work entirely according to your needs. They are at once easy-to-use and very specialized tools.