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Password Hacking and DoS Attacks

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Password Hacking

Password cracking is the manner of recovering secret passwords from facts that has been stored in or transmitted by a pc system. A common method is to repeatedly try guesses for the password. Most passwords may be cracked with the aid of using following techniques :


Here we will confer with the one manner function (which can be both an encryption feature or cryptographic hash) hired as a hash and its output as a hashed password. If a system makes use of a reversible function to obscure stored passwords, exploiting that weak spot can get better even ‘well-chosen’ passwords. One example is the LM hash that Microsoft Windows uses with the aid of default to shop consumer passwords which can be less than 15 characters in length. LM hash breaks the password into two 7-man or woman fields which might be then hashed separately, allowing every half of to be attacked separately.


Many passwords may be guessed either with the aid of human beings or via sophisticated cracking programs armed with dictionaries (dictionary based) and the user’s personalinformation. Not surprisingly, many users pick out weak passwords, usually one associated with themselves in a few way. Repeated research over a few 40 years has verified that around 40% of user-chosen passwordsare effortlessly guessable by way of programs. Examples of insecure choices include:

  • blank (none)
  • the word “password”, “passcode”, “admin” and their derivatives
  • the user’s call or login name
  • the call of their giant different or any other person (loved one)
  • their birthplace or date of birth
  • a pet’s name
  • a dictionary phrase in any language
  • car licence plate number
  • a row of letters from a trendy keyboard layout (eg, the qwerty keyboard — qwerty itself, asdf, or qwertyuiop)
  • a simple modification of one of the preceding, inclusive of suffixing
  • a digit or reversing the order of the letters. And so on

In one survery of MySpace passwords which have been phished, 3.8 percentage of passwords had been a single word discovered in a dictionary, and every other 12 percentage have been a phrase plus a very last digit; two-thirds of the time that digit was.

A password containing each uppercase &  lowercase characters, numbers and special characters too; is a strong password and might never be guessed.

Default Passwords:

A moderately high wide variety of local and online programs have built in default passwords that have been configured with the aid of programmers during development ranges of software. There are lots of programs strolling on the internet on which default passwords are enabled. So, it is pretty easy for an attacker to enter default password and benefit get right of entry to to touchy information. A listing containing default passwords of some of the most popular programs is available on the net.

Always disable or trade the applications‘ (each on line and offline) default username-password pairs.

Brute Force:

If all other techniques failed, then attackers makes use of brute force password cracking technique. Here an automatic tool is used which tries all possible mixtures of to be had keys on the keyboard. As quickly as correct password is reached it shows on the screen.This techniques takes extremely long term to complete, but password will virtually cracked.

Long is the password, large is the time taken to brute force it.


This is the most effective and effortlessly executable password cracking technique which is commonly used to crack the passwords of e-mail accounts, and all those accounts in which secret data or sensitive personal statistics is stored by means of user including social networking websites, matrimonial websites, etc.

Phishing is a method in which the attacker creates the faux login screen and send it to the sufferer, hoping that  the sufferer gets fooled into entering the account username and password. As soon as sufferer click on “enter” or “login” login button  this facts reaches to the attacker the usage of scripts or online shape processors while the user(sufferer) is redirected to domestic page of e-mail service provider.

Never provide reply to the messages which can be stressful on your username-password, urging to be e-mail service provider.

It is possible to attempt to achieve the passwords via other one-of-a-kind methods, such as social engineering, wiretapping,
keystroke logging, login spoofing, dumpster diving, phishing, shoulder surfing, timing attack, acoustic cryptanalysis, the use of  Trojan Horse or virus, identification management machine attacks (including abuse of Self-provider password reset) and compromising host security.

However, cracking commonly designates a guessing attack.