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ARTICELS Computers And Internet

Sunday, March 25, 2007

RSA Attack Efficiency Improves

by: Carl Jongsma

August 2006 saw the disclosure of a fairly interesting attack against the RSA encryption algorithm (most famously being used in SSL - protecting online transactions). While it didn't target the actual algorithm, which still has not been broken, it is a so-called side channel attack, targeting the peculiarities associated with implementing the algorithm on various computing hardware.

The team behind the initial disclosure have recently submitted a modified approach to the attack, resulting in almost-astronomical improvements in attack efficiency.

In basic terms, the attacks rely upon a phenomenon known as 'Branch Prediction Analysis', where a program / attacker is able to predict what other software is doing as it passes through the CPU of a system.

In the first iteration of the described attack, the method required snooping on what was happening with the CPU for a relatively long period (or number of cycles), and certain software that implemented SSL protection (OpenSSL) quickly introduced patches to protect against this listening attack.

While many hardware manufacturers and Operating System developers have introduced defensive mechanisms to try and prevent this sort of attack taking place, it has been discovered that Pentium-IV (PIV) chips with Hyper-Threading enabled still have two caches that are not adequately protected. The new iteration of the attack, using a technique dubbed 'Simple Branch Prediction Analysis' (SBPA) targets both of these caches and can extract almost the complete secret SSL key in just one cycle. Running as an unprivileged user, this method can also target and extract data from any other software processes running on the system (SSL is an example in this case).

The technical black magic of how a branch predictor attack works can be explained as follows. Although modern CPUs are very quick, they still can't process absolutely every bit of information that they need to without a queue building up. This queue of instructions / data waiting for processing sits in a cache next to the CPU and they are executed in order of priority / time spent in the queue (various tuning settings come into play). By attempting to monopolise the CPU's attention, and filling the cache, the miniscule timing differences between when instructions from the same process are executed can give hints about what other instructions and data are moving through the CPU. Being able to interpret what this data is exactly, is key to branch prediction.

Mitigating the issue is the requirement to be running secure and insecure processes on the same processor at the same time, and for the attacker being able to run their process as a local user. Due the spying process capturing almost 100% CPU continuously while it is running, normal system monitoring software should be alerting administrators to something out of the ordinary running on the system.

What real-world threat exists for this relatively esoteric attack? Shared-server installations. It would be possible for a lesser-privileged account holder on a shared server to run the spying process while other account holders are negotiating SSL connections. A well timed attack will allow them to run their spying process once (and thus minimise the attention drawn to it), and then be able to effectively intercept SSL communications directed at the target.

posted by rizkhey wahyudi @ 8:15 PM 0 comments

Rollback Rx - A Disaster Recovery Solution

by: Jacob Henderson

Rollback Rx system restore software helps in disaster recovery. If you work with computers, you have to be prepared with a disaster recovery solution. What is disaster recovery?

It is the ability to speedily recover from the loss of data. It restores system settings so that your system is ready to use as quickly as possible, retrieving data and making it accessible to you. Rollback Rx does this in minutes, whereas if one were to use manual recovery methods, there’s no guarantee that data will be intact, not to mention the hours or days that it might take to repair computers.

In spite of advances in rollback technology, data continues to be lost through user errors and unsuccessful software installs. Updates create a problem necessitating disaster recovery. Windows system restore only restores computer settings but does not recover data.

In such a situation, the ideal system restore software is Rollback Rx, which practically helps a business to keep running.

Rollback Rx Retrieves Critical Data

In business organizations, if there has been data loss, their success in maintaining continuity of work depends more on their ability to retrieve their data as fast as possible, rather than getting the hardware up and running. The important information in most organizations resides in electronic form inside a computer – making it critical to have access to it at all times. Rollback Rx makes sure that you can recover your data right up to the moment your pc crashed – ensuring that you have your data back so that you are not stuck without vital information while making business decisions.

Rollback Rx system restore software keeps track of data and system files as they keep altering. Lets say you are working on a document and happen to delete a part of it, then save it after you change it. Suddenly you realize that you did not want to delete that information. Maybe it runs to several pages and will take hours to create again. With Rollback Rx software, you can revert right back to the earlier version of the file with absolutely no data loss. You can restore computer settings, registry settings, and rollback to any earlier moment in time. Suppose your system is affected by malware or unsolicited software downloads and installations, you can use Rollback Rx to fix computer problems by restoring your system back to an operational point.

RollBack Rx protects you from day zero attacks by taking system snapshots based on a set schedule for your system, restoring your crashed system without data loss in just the time it takes to reboot your system.

posted by rizkhey wahyudi @ 8:13 PM 0 comments

Powerful Flexibility With Rollback Rx

by: Jacob Henderson

PC maintenance is a challenge for businesses today. Most corporations spend millions every month to keep their computers operational and running, constantly fixing computer problems and recovering lost data.

They constantly encounter new viruses getting into their systems in spite of seemingly adequate prevention measures. Every time they update with new software patches, they have to be careful and prepared to fix computer issues if it goes wrong. More than anything else, they must be prepared for disaster recovery if there are network intrusions and identity thefts causing computers to crash indefinitely. The IT support is sometimes unable to identify the cause for such repairs. One way to avoid all this is by installing Rollback Rx, system restore software and the complete PC maintenance solution.

Protection Against Disasters

Just as better solutions are on the rise, so are new viruses, spyware and Trojans. Every computer is in danger of being infected. When a corporate network is involved the risk is exponentially high. The Rollback Rx software works as a perfect mate with antivirus software, totally compatible with it, to repair computer problems. Together, the two make a strong defense against virus attacks. But there are times when spyware comes disguised and anti virus programs may not detect them. In such cases, Rollback Rx is particularly useful because it helps to rollback any system to an earlier operational state, totally cleaning the computer of the suspect spyware. What would otherwise have meant several hours of downtime for the system is now reduced to something like three minutes per system. Almost every bit of data is recovered, with the remote possibility of a five per cent loss. And even if some systems are remotely located, Rollback Rx can still trouble shoot over a network.

Boon To Beta Testers

It is always a tricky thing to test new applications. There’s the risk of causing total failure. But with Rollback Rx as a safety net to fall back on, IT administrators can securely test new applications. If the deployment fails, with Rollback Rx, the system can be quickly rolled back to the point before the test was begun. It might have taken hours without Rollback, but with Rollback it only takes seconds to do a pc restore. This makes the risk of new application deployment low, with Rollback Rx.

Maintenance becomes a smooth operation with Rollback Rx. Unwanted software and spyware can be easily removed by doing a pc restore, thus allowing minimum chances of damage to the corporate network. With instant system restore, Rollback Rx software strengthens the capability of every PC.

posted by rizkhey wahyudi @ 8:10 PM 0 comments

Instantaneous Recovery From Virus Attacks With Rollback Rx

by: Jacob Henderson

If you think why use Rollback Rx, think again. Keeping an organization’s computers continuously online and fully functional is stressful work. Even huge corporations are sometimes at a loss to know what to do if there’s a massive virus attack.

It is mind-boggling to think about the expense of replacing expensive operating systems and let us not even contemplate replacing all the data lost! It is an organization’s worst nightmare to even think about having a virus attack that will bring their business to a total standstill. It does not bear thinking about losing customers because system restore software didn’t work and critical data could not be accessed. The techies are unable to fix computer problems in such a scenario no matter how hard they try, and they spend hours of precious time trying to figure out what went wrong.

Negligible Impact On User Productivity

With Rollback Rx, you have an instantaneous recovery solution from virus attacks because you can roll back your computer to a point before the virus attacked. You can revert to a working state by doing a pc restore through a snapshot within your pc boot cycle, with almost a hundred per cent data recovery. Just before performing the rollback, support can take a snapshot of the virus-infected system to preserve all the files since the last back up. This snapshot will be accessible later to enable them investigate the cause and understand what went wrong. The most important files can be kept under quarantine, repaired and restored to the user – all minus the virus! After support identifies what the problem is, they can coordinate with the antivirus people to get the appropriate solution to avoid such a situation. But this does not affect the user as pc restore enables him continue with his work.

Rollback Rx’s ability to take multiple snapshots of the system, allowing the user to roll back or forward to a preferred system state is a powerful advantage that helps organizations come out of a virus attack with any major loss of data. In fact, it is the fastest system restore software in the market and hardly uses any hard drive space. PC users feel that it is absolutely essential to have a system restore software like Rollback Rx, which is way ahead in its capabilities compared to other conventional methods. If your Windows operating system crashes, thanks to a corrupted system file, you can still access Rollback Rx from the boot sequence and do a pc restore real quick.

Most users of Rollback Rx system restore software appreciate the flexibility and ease of use that it provides making it an invaluable and integral part of any maintenance solution.

posted by rizkhey wahyudi @ 8:09 PM 0 comments

How to Start Video Blogging?

by: Kanicen Nichathavan

Videoblogging is the next generation of posting ideas and products over the internet. Everybody knows about textblogging. Now they use videos for a better way of expression. This form of communication may entail a lot of resources, but it is all worth it. If pictures say a thousand words, videoblogging exceeds that by far.

A videoblog requires larger disk spaces on websites, a faster server, and a whole new set of programs to support it. Videoblogs can be fed through RSS. This is technology of syndicating your website to other RSS aggregators.

Videoblogging works with people on the internet expressing their selves. Now if you put this on a business prospective, you are up to a lot of benefits. Think of it as a powerful tool in making showing your prospective customers your line of products or your services. It’s just like showing a commercial all for free. And if you videoblog through RSS, then most probably you are getting your target market.

People like to see what they are going to buy. Some would like to see proof and be sure that they are getting their money’s worth before shelving their dimes on it. All of us know the influence of a thirty second commercial. The effect of videoblogging is similar to that. You show your product, people watch it. If they like it, they buy it. If you present it good enough, they’ll buy the product even if they don’t need it.

Now on the web, things are pretty much static, unlike in television in which all are moving. If you post something that is mobile, it would most likely catch attention. Now imaging your product parading in all it’s royalty through videoblog. You’ll get phone call orders in no time.

If your business is just starting up, you can create a videoblog right at your own home. All you need is your web camera, microphone, video software, and lights. For as long as you know how to use your camera, then you can create a videoblog.

Invest in a good web camera. The higher its resolution is the better the output. And you like to present your goods in the optimum way so get the best one possible. Make a short story, or just capture your goods in one go. Just make sure you are getting the best profile for each. Get those creativity juices flowing.

Lights are important in a production. Make sure you illuminate entirely the area you are going to use to create videoblog. The brighter the area, the crispier the images will be. You can also use lighting effects for added appeal to the presentation.

Should you require sounds for your videoblog, you need a microphone. Record you voice as a voice over for promoting the product and its benefit to consumers. Sounds are as important as videos on a videoblog. It is advisable to make your sound effects as enticing as the video.

Your video editing software can be any program. You need this to finalize your work. You can add sounds, delete some bad angles, or insert some still pictures in there too. Some programs are user-friendly and can be used even with zero knowledge on video editing. Even simple video editing programs should do the trick. Select your background carefully too. The light affects the presentation so make sure that the background and the light complements each other.

Videoblogging is a great tool but it also has it downside. It may slow down the computer so other may steer clear of it. Download time may also be time consuming especially if customer is still on a dial- up connection.

But don’t let those stop you. Let videoblogging be an alternative for you, though it is best to still keep the text and pictures present in your presentation to accommodate all possible viewers of your site.

Nowadays, the more creative you are in presenting your product to the market, they more you are likely to succeed. Videoblogging offers an interactive way of selling. You involve the customers. You instill in them the advantage of your goods. And at times, those are enough to make a sale.

posted by rizkhey wahyudi @ 8:07 PM 0 comments

Advanced Uses For Myspace

by: David Riewe

MySpace members can generate a website quickly through templates. These templates enable users to create a generic website in very little time. For those who are just interested in making new friends or keeping in touch with old friends, this may be all the member needs.

However, those who want to offer more on their website or those who simply want to create a more detailed website may require some more advanced knowledge to achieve the desired effects.

Adding Background Music in MySpace

The majority of websites on the Internet do not have background music. This may lead many novice MySpace members to believe adding music to the background is a difficult process but it really isn’t. In fact MySpace makes it incredibly simple for members to add music to their profiles. The steps to add music to a MySpace profile are as follows:

* Log into your MySpace account
* While logged in visit this web address: http://music.myspace.com/index.cfm?fuseaction=music
* Listen to the music available and select a suitable song for your profile
* Click on the link that says “Add” below the song title
* The music is then automatically added to your profile

It is important to note that users can only add one song at a time to their profile. Clicking the “Add” link on a second song will result in the original song being replaced on the profile by the new song. Songs can be removed from a profile at any time by going to the “Edit profile” section of your account and entering the “Profile songs” subcategory. Here you have the option to remove your chosen song.

Adding Videos to MySpace

Adding videos to MySpace is also not as difficult as it seems. Even those with no HTML skills can add videos produced by other members or even their own videos to their MySpace profile. The steps to add a video to your MySpace profile are as follows:

* Log into your MySpace Account
* From your MySpace homepage, click on the “Add/Change Videos” link
* You are then taken to another webpage where you can either search through a database of previously uploaded videos or upload your own video
* To search the database, click on the search videos button and browse through the available videos
* After watching a video you can add the video to your profile in a couple of ways. First you can click on the “Add to my profile” button or you can copy the source code provided and paste this code into the desired location on your profile.

Alternately you can add your own videos to your MySpace profile by first uploading them to MySpace and then adding them to your profile. When uploading a video care should be taken to ensure the video does not violate the terms of service.

Creating Interactive Features on MySpace

Creating interactive features on MySpace is a bit more involved. Members can create features which allow visitor interaction but these features require more extensive HTML knowledge. The best way to acquire the information necessary to design these types of features is to research the subject of HTML code in books or on the Internet. However, if you find a feature on another MySpace website you would like to include in your own profile you can contact the member and ask them how to add this feature.

posted by rizkhey wahyudi @ 7:58 PM 0 comments

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