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Data Recovery - You Can Get It Back!
Data Recovery - You Can Get It Back!
by Keith Thompson
Data recovery is a process whereby you can save data and
files you accidentally deleted, had eaten by malicious
software or viruses, hardware failures, corporate espionage
and many...
Hard Disk Data Recovery Expert: Choosing Yours
If you need a hard disk data recovery expert, you need one now.
You have just lost a good amount of work that you need to send,
well, yesterday. No matter how well versed you think you are in
the computer world, chances are that at some point,...
Linux or Windows - Which is it?
Computer users and programmers have become so accustomed to
using Windows, even for the changing capabilities and the
appearances of the graphical interface of the versions,
therefore it has remained Microsoft's product. Although,
Lycoris, Red...
Mr
Introduction Although online data backup is more widely known now than ever before and has grown with the advent of broadband access, many don't really know what if any differences exist between the services on offer. As with all products and...
Scalability testing: 7 steps towards success
Systems that work well during development, deployed on a small scale, can fail to meet performance goals when the deployment is scaled up to support real levels of use.
An apposite example of this comes from a major blue chip company that...
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Background Of Password Cracking
Passwords to access computer systems are usually stored, in some form, in a database in order for the system to perform password verification. To enhance the privacy of passwords, the stored password verification data is generally produced by applying a one-way function to the password, possibly in combination with other available data. For simplicity of this discussion, when the one-way function does not incorporate a secret key, other than the password, we refer to the one way function employed as a hash and its output as a hashed password. Even though functions that create hashed passwords may be cryptographically secure, possession of a hashed password provides a quick way to verify guesses for the password by applying the function to each guess, and comparing the result to the verification data. The most commonly used hash functions can be computed rapidly and the attacker can do this repeatedly with different guesses until a valid match is found, meaning the plaintext password has been recovered.
The term password cracking is typically limited to recovery of one or more plaintext passwords from hashed passwords. Password cracking requires that an attacker can gain access to a hashed password, either by reading the password verification database or intercepting a hashed password sent over an open network, or has some other way to rapidly and without limit test if a guessed password is correct. Without the hashed password, the attacker can still attempt access to the computer system in question with
guessed passwords. However well designed systems limit the number of failed access attempts and can alert administrators to trace the source of the attack if that quota is exceeded. With the hashed password, the attacker can work undetected, and if the attacker has obtained several hashed passwords, the chances for cracking at least one is quite high. There are also many other ways of obtaining passwords illicitly, such as social engineering, wiretapping, keystroke logging, login spoofing, dumpster diving, timing attack, etc.. However, cracking usually designates a guessing attack.
Cracking may be combined with other techniques. For example, use of a hash-based challenge-response authentication method for password verification may provide a hashed password to an eavesdropper, who can then crack the password. A number of stronger cryptographic protocols exist that do not expose hashed-passwords during verification over a network, either by protecting them in transmission using a high-grade key, or by using a zero-knowledge password proof.
About the Author: David and his team developed Article Post Robot, http://www.articlepostrobot.com, the software which can post articles to hundreds of article sites and mail lists automatically.
Source: www.isnare.com
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