Recently I've had a good deal of people ask me about SSH connections, and how they can better secure them, and I've been shocked at the sheer number of people that still use keyboard-interactive password authentication to log into SSH daemons. This article will explain the use of SSH keys and OpenSSH options to speed up and secure your SSH connection.SSH optionsThere are a few useful options you can pass to OpenSSH to increase your verbosity, compress and speed up your ssh connection, and change your SSH cipher to something faster and more secure;'-v' switch. This option will allow you to see debug output for outgoing SSH connections. Specifying '-v' multiple times increases the verbosity level (maximum level 3).'-C' switch. This option compresses all of your SSH data. Passing this option to OpenSSH may speed things up dramatically on slow networks, but on high-speed networks it will only slow things down.'-c' switch. This option will allow you to change your cipher method. The default is 3des, which is a 3-way encryption method that is believed to be secure - however, blowfish is also available, which is a fast block cipher which also believed to be very secure and is far faster than 3des.For example, let's say I want to log in as user 'foo' to an ssh daemon on host 'example.com'. I want maximum verbosity level, I want to compress all my data, and I want to change my SSH cipher to blowfish. The command would look like this:ssh -vvv -C -c blowfish -l foo example.com(Note: the higher your verbosity level, the more text you will get on your terminal while OpenSSH goes through the process of logging in to the remote SSH daemon. Even specifying only one -v can get you a veritable flood of information. Fiddle around with -v until you find a debug level that you're comfortable with.)SSH keysOpenSSH supports a method of authentication far more secure than keyboard-interactive password authentication using a combination of public/private key cryptography. A pair of keys is generated, one on the remote machine to authenticate you and let you in. The other is a private key to match the key on the remote machine.To generate a pair of cryptographic keys, you would use the ssh-keygen(1) utility on both the machine you intend to log in to, and the machine you intend to log in from. For example;ssh-keygen -t rsaThe -t option specifies the type of key to be generated. Available options are dsa and rsa.Inputting this command on either of your UNIX machines should give you an output like this:$ ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/home/example/.ssh/id_rsa):Enter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /home/example/.ssh/id_rsa.Your public key has been saved in /home/example/.ssh/id_rsa.pub.Setting a passphrase is highly recommended to maximize security. Good passphrases are between 10 and 30 characters long, and are not easily guessable in any way. If you do not enter a passphrase, you will be able to login to your remote system without entering any password on login.The next step is to authorize your keys on the remote machine you intend to log in to. You can do this using a file named authorized_keys on your target machine. Copy your ~/.ssh/id_rsa.pub file onto your remote machine using scp(1)scp ~/.ssh/id_rsa.pub example.com:.ssh/authorized_keysNow log in to your target machine using ssh(1) with a debug level of 1as previously shown;ssh -v -C -c blowfish -l foo example.comYou will see debug messages like so;debug1: Authentications that can continue: publickey,keyboard-interactivedebug1: Next authentication method: publickeydebug1: Offering public key: /home/example/.ssh/id_rsadebug1: Server accepts key: pkalg ssh-dss blen 435debug1: read PEM private key done: type rsaYou should then be prompted for your key passphrase (if you entered one) and then let into the system. If you didn't enter a passphrase upon generating your public/private keys, you will be passed through without having to enter any. If you encounter errors, you should check the permissions of your ~/.ssh directories on both machines.If you wish to change your key passphrase at any time, you can do so by passing the -p flag to the ssh-keygen utility;ssh-keygen -p
There are a lot of different types of manufactures and you will also want to think about doing the proper research. Course, you will find that it all depends on what you would like to do with the GPS system. You will find that there are GPS units that will help you to locate your position at any given time, but you will also find that there are many different GPS systems that do a lot of other thing as well.When it comes to using the GPS tracking systems you will want to make sure that you are able to red this electrical maps. You will find that they can be a little static, but if you are able to read a map according to longitude and latitude, you will be just fine. You will want to keep in mind that when you go camping, you will need to make sure that the GPS unit battery life is very long. This is so that you dont end up getting lost in the wilderness and you will want to read up in the owners manual on how you can keep the length of the battery going strong so that you can be prepared for a good hike.You may also want to get a waterproof unit, because you never know if you will run into some unexpected camping climate changes. Rain is not something that a lot of weather reports can honestly report. Yu will want to makes sure that you do every thing you can to preserve the integrity of the unit so that you dont end up being lost in the middle of nowhere with no GPS tracking system.When it comes to purchasing one of these units, you will want to have at least twenty route capacity, however, fifty is always best. More is always better when it comes to the GPS system that you are going to purchase. You need it to help you and show the way home. You will find that it is the GPS system that will help you to get from one point to another quickly and without concern. You will want to make sure that you learn how to read the map so that you can use the unit to its potential. You will also find that there are ergonomic factors that will important when purchasing. This means that you need to fit it in your hand and it can not be that heavy (or youll get tired to quickly).
Sennheiser Headphones are one of the most amazing pieces of technology to give you great sound, and make a great present to give to yourself or anyone you love. They outdo many other brands that are out right now, and can be bought at great prices as well.This particular brand works hard to please customers, and has done so with their fantastic line of headphones that work great for almost any use. They are user friendly, stylish, and the list just goes on and on.#1 Block Out Background NoiseHave you ever been listening to your favorite song and then a bus goes by or someone is talking loud next to you and you miss that "had to hear it" part of the song or whatever? Well that won't happen with this headphone brand. The closed ear cups keep outside noise outside, making it much easier and more enjoyable to listen to music almost anywhere.#2 Great designUnlike most other headphone companies on the market, these ones are simple yet stylish. They have only a few buttons that cover the necessities, yet look great enough to take with you anywhere when on the go. They are full-sized yet lightweight and easy to take with you, making them the ultimate package when looking for the perfect headphone brand to stick with for life.#3 ComfortableWrapped in comfortable padding and fabric, the Sennheiser headphones are a must have. They won't get uncomfortable after wearing them for a few songs, especially since they cradle your ears to provide the ultimate listening experience. Their lightweight design makes it seem like they aren't even there, so you can listen during many of your normal day-to-day activities.#4 Very User FriendlyEven though the advancement of technology over the past few years have been absolutely amazing, it is sometimes nice to be able to easily use a product to its full extent. That is possible when you purchase this brand of headphone, since there are no crazy buttons or menus to fidget around with. Everything you need, such as volume, power, and tuning dial, are all included, making it possible to listen to music without having to spend hours reading an owner's manual. They can be used right out of the packaging, and are great for anyone who is technology-illiterate.#5 DurabilityYou will never have to worry about them dropping or accidentally breaking, since the strong design makes them durable and ready to take on the world. They are great for taking on the go because they can be thrown into a purse or bag with no problem, or you can even throw them around your neck for a short outing. Don't worry about your children with this particular brand, because the padded headband is strong yet lightweight at the same time. They are a great investment that can be passed on to future generations, as long as they are taken care of and not abused.#6 Ambient Sound CapabilityYou will never have to worry about not being able to hear your friends talking or your cell phone ringing, since tiny microphones are used to pick up and transmit ambient sound to the user. The tiny microphones can distinguish close important sounds such as a conversation from background sounds, making it possible to have an amazing listening experience. The important noise is heard and the annoying stuff gets left behind.#7 PriceThese cans may be more expensive than some of the brands that can be purchased at local superstores or drug marts, but they are well worth the price. They outdo all other brands within the same price range, and perform much better than any other company can claim. They range from about $100 to $500 depending on the model, and can be used for years and years to come.They are currently the most comfortable, stylish, durable, and user friendly phones on the market right now, and have features that no other company can offer. The Sennheiser headphones have an amazing price that can be afforded by many, but leave people feeling like they are living the luxurious life.
Today, Nokia adds up new modish gears that would surely perk up your fashion sense through stylish and up to date mobile phones.Nokia is a world leader in mobile communications, steering growth and sustainability for mobile industry. Thus, they have developed mobile devices that connect people and the information that matters to them with easy-to-use innovative "mobile phone" products with superb solutions for imaging, games, media and businesses. Indeed, with Nokia mobile phones, everything you want is in the palm of your hand!So whether you are a cool scholar or up-to-the-minute schoolgirl, a trendy parent, a brainy boss, a cutie staff or you are just someone who is in mobile business enterprise heres a smart rundown of the common mobile phone designs that would surely fit your taste and style:Clamshell or folder: A lot of people out there might have seen this style of cell phone but just didn't know what to call it. Normally, these mobile phones consist of two parts with a hinge in the middle. When it is not in use, it folds closed. The top half of the design placed the speaker or earpiece and a display window, while the bottom half placed the keypad and other apparatus. Nokia "cell phone" s have added a twist to the hinged apparatus. For phones that support cameras and Internet connections, the hinge can be turned for easy viewing. These phones often come with the active flip feature that lets you close the phone to automatically end a call or answer it.Flip: These phones have most of the components on one part of it with a flip piece that covers part of the keypad when it is not in use. Nearly all Nokia mobile phones offer the active flip feature in these designs.Slide: These phones are more like a clamshell style cell phone. The slide usually has the keypad on one half and the display window while the speaker is placed on the other. Nokia mobile phones actually offer some of the most interesting looking slide camera phones available. Instead of the hinge, the components slide open. This feature and design allows a larger display area for videophone calling and other features.Bar or block (also called candy-bar): This is considered the most basic of the styles. There are no moving parts to compete however when it comes to the protection of the keypad while it is in your pocket or purse Nokia have considered putting a key guard feature that allows you to lock and unlock the keys.Smart phone: Looks like a bar phone, Nokia mobile phones offer one of the lightest weight and most compact models available anywhere. With a Smart phone have internet access, e-mail access, view and edit important documents, scheduling software, built-in camera, contact management, accelerometer and a lot more!Overall, these cellular phones are really THE THING as it surpasses the typical mobile phones with its amazing devices with tremendous functionality. And when it comes to advanced technology these phones also features integrated GPS, Wi-Fi, Bluetooth, and now with innovative two-way communication! Hows that? Isnt it chic?
With the vast quantities of choices out there in the land of cell phones, shopping for a new cell phone can be remarkably frustrating. How hard can it really be? You want a phone that isnt too big that lets you talk to people and if does a few other cool things then thats really a bonus.However, with all the options in "cell phones" it can be like standing in a sea of technology that evolves right before your eyes. Depending on the location you choose to purchase your new cell phone you may leave with a headache the size of Mount Everest.Choose your cell phone shopping location with great care. Choosing a poorly staffed cell phone kiosk may actually guarantee you leave with the wrong phone. You are going to want to ask some questions, even if you have already done the research and are pretty sure you know what you want. Asking intelligent questions and being replied to with blank stare and a shrug of the shoulders by minimum wage teenager is not exactly stellar customer service.While the mall is often the most convenient place to shop for a new cell phone, the kiosks may not be the most beneficial place to shop. While there have been improvements in kiosk sales representative by order of the cell phone companies, be sure to start asking questions prior to looking for a phone. While they may know the basics of cell phone knowledge, they may not be able to know how to get you every bit of phone you need with the right services for the best price. You may walk away with the phone you want while overpaying on the plan by nearly 25%Do some homework on your own before deciding to get a new cell phone. It is possible that your current cell phone may be upgradeable. If not, you should at least know the phone that you are looking for and what features you want to purchase with it. If you simply walk into a cell phone store and expect the store clerk to be able to show you model after model of cell phones you will be highly disappointed. They either wont have the information you really need or they will stand there so long explaining every phone they carry that you could have eaten, read three stories to the kids, watched television and crawled in bed for the night before he is even halfway through the presentation.