- · Don’t note down the passwords anywhere, just memorize them.
- · Set strong passwords that are difficult to crack.
- · Use a combination of alphabets, digits, symbols, and capital and small letters.
- · Don’t set passwords that are similar to their usernames.
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Monday, 18 September 2017
Ethical Hacking – Password Hacking
We have passwords for emails, databases,
computer systems, servers, bank accounts, and virtually everything that we want
to protect. Passwords are in general the keys to get access into a system or an
account.
In
general, people tend to set passwords that are easy to remember, such as their
date of birth, names of family members, mobile numbers, etc. This is what makes
the passwords weak and prone to easy hacking.
One should always take care to have a
strong password to defend their accounts from potential hackers. A strong
password has the following attributes:
·
1. Contains at least 8 characters
·
2. A mix of letters, numbers, and special characters
·
3. A combination of small and capital letters.
Dictionary
Attack
In a dictionary attack, the hacker uses a
predefined list of words from a dictionary to try and guess the password. If
the set password is weak, then a dictionary attack can decode it quite fast. Hydra is a popular tool that is
widely used for dictionary attacks. Take a look at the following screenshot and
observe how we have used Hydra to find out the password of an FTP service.
Hybrid
Dictionary Attack
Hybrid dictionary attack uses a set of
dictionary words combined with extensions. For example, we have the word “admin”
and combine it with number extensions such as“admin123”, “admin147”, etc. Crunch
is a wordlist generator where you can specify a standard character set or a character set. Crunch can generate all
possible combinations and permutations. This tool comes bundled with the Kali
distribution of Linux.
Brute-Force
Attack
In a brute-force attack, the hacker uses
all possible combinations of letters, numbers, special characters, and small
and capital letters to break the password. This type of attack has a high
probability of success, but it requires an enormous amount of time to process all
the combinations. A brute-force attack is slow and the hacker might require a
system with high processing power to perform all those permutations and
combinations faster. John the Ripper or Johnny is one of the powerful tools to
set a brute-force attack and it comes bundled with the Kali distribution of
Linux.
Rainbow
Tables
A rainbow table contains a set of
predefined passwords that are hashed. It is a lookup table used especially in
recovering plain passwords from a cipher text. During the process of password
recovery, it just looks at the pre-calculated hash table to crack the password.
The tables can be downloaded from http://project-rainbowcrack.com/table.htm
RainbowCrack 1.6.1 is the tool to use the
rainbow tables. It is available again in Kali distribution.
Quick Tips
Friday, 15 September 2017
Ethical Hacking − Terminologies
FOLLOWING IS A LIST OF IMPORTANT TERMS USED IN THE FIELD OF HACKING
· Adware: Adware
is software designed to force pre-chosen ads to display on your system.
· Attack: An
attack is an action that is done on a system to get its access and extract sensitive data.
· Back door: A back door, or trap door, is a hidden entry to a computing device
or software that bypasses security measures, such as logins
and password protections.
· Bot: A
bot is a program that automates an action so that it can be done repeatedly at a much higher rate for a more sustained period than a
human operator could do it. For example, sending HTTP, FTP or Telnet at a higher
rate or calling script to create objects at a higher rate.
· Botnet: A
botnet, also known as zombie army, is a group of computers controlled without their owners’ knowledge. Botnets are used to send
spam or make denial of service attacks.
· Brute force attack: A brute force attack is an automated and the simplest kind of method to gain access to a system or website. It tries
different combination of usernames and passwords, over and over again, until it
gets in.
· Buffer Overflow: Buffer Overflow is a flaw that occurs when more data is written to a block of memory, or buffer, than the buffer is
allocated to hold.
· Clone phishing: Clone phishing is the modification of an existing, legitimate
email with a false link to trick the recipient into providing
personal information.
· Cracker: A cracker is one who modifies the software to access the features
which are considered undesirable by the person cracking the
software, especially copy protection features.
· Denial of service attack (DoS): A denial of service (DoS) attack is a malicious attempt to make a server or a network resource unavailable
to users, usually by temporarily interrupting or suspending the services of a
host connected to the Internet.
· DDoS: Distributed
denial of service attack.
· Exploit Kit: An exploit kit is software system designed to run on web servers,
with the purpose of identifying software vulnerabilities in
client machines communicating with it and exploiting discovered
vulnerabilities to upload and execute malicious code on the client.
· Exploit: Exploit is a piece of software, a chunk of data, or a sequence of
commands that takes advantage of a bug or vulnerability to
compromise the security of a computer or network system.
· Firewall: A firewall is a filter designed to keep unwanted intruders outside
a computer system or network while allowing safe
communication between systems and users on the inside of the firewall.
· Keystroke logging: Keystroke logging is the process of tracking the keys which are pressed on a computer (and which touchscreen points
are used). It is simply the map of a computer/human interface. It is used by gray
and black hat hackers to record login IDs and passwords. Keyloggers are usually
secreted onto a device using a Trojan delivered by a phishing email.
· Logic bomb: A virus secreted into a system that triggers a malicious action
when certain conditions are met. The most common version is the
time bomb.
· Malware: Malware is an umbrella term used to refer to a variety of forms of
hostile or intrusive software, including computer viruses, worms,
Trojan horses, ransomware, spyware, adware, scareware, and other
malicious programs.
· Master Program: A master program is the program a black hat hacker uses to remotely transmit commands to infected zombie drones,
normally to carry out Denial of Service attacks or spam attacks.
· Phishing: Phishing is an e-mail fraud method in which the perpetrator sends
out legitimate-looking emails, in an attempt to gather
personal and financial information from recipients.
· Phreaker: Phreakers are considered the original computer hackers and they
are those who break into the telephone network illegally,
typically to make free long distance phone calls or to tap phone lines.
· Rootkit: Rootkit is a stealthy type of software, typically malicious,
designed to hide the existence of certain processes or programs from normal
methods of detection and enable continued privileged access to a computer.
· Shrink Wrap code: A Shrink Wrap code attack is an act of exploiting holes in unpatched or poorly configured software.
· Social engineering: Social engineering implies deceiving someone with the purpose of acquiring sensitive and personal information,
like credit card details or user names and passwords.
· Spam: A
Spam is simply an unsolicited email, also known as junk email, sent to a large number of recipients without their consent.
· Spoofing: Spoofing is a technique used to gain unauthorized access to
computers, whereby the intruder sends messages to a computer with an
IP address indicating that the message is coming from a trusted host.
· Spyware: Spyware is software that aims to gather information about a person
or organization without their knowledge and that may send
such information to another entity without the consumer's consent, or that
asserts control over a computer without the consumer's knowledge.
· SQL Injection: SQL injection is an SQL code injection technique, used to attack data-driven applications, in which malicious SQL statements
are inserted into an entry field for execution (e.g. to dump the database
contents to the attacker).
· Threat: A
threat is a possible danger that can exploit an existing bug or vulnerability to compromise the security of a computer or
network system.
· Trojan: A
Trojan, or Trojan Horse, is a malicious program disguised to look like a valid program, making it difficult to distinguish from
programs that are supposed to be there designed with an intention to destroy files,
alter information, steal passwords or other information.
· Virus: A
virus is a malicious program or a piece of code which is capable of copying itself and typically has a detrimental effect, such as
corrupting the system or destroying data.
· Vulnerability: A vulnerability is a weakness which allows a hacker to compromise the security of a computer or network system.
· Worms: A
worm is a self-replicating virus that does not alter files but resides in active memory and duplicates itself.
· Cross-site Scripting: Cross-site scripting (XSS) is a type of computer security vulnerability typically found in web applications. XSS
enables attackers to inject client-side script into web pages viewed by other users.
· Zombie Drone: A Zombie Drone is defined as a hi-jacked computer that is being used anonymously as a soldier or 'drone' for malicious
activity, for example, distributing unwanted spam e-mails.
Monday, 11 September 2017
HOW TO INSTALL WINDOWS ON A MAC
Boot Camp
Boot Camp helps you install Microsoft Windows on your Mac. After
installing, restart your Mac to switch between macOS and Windows.
What You
Need
·
An
Intel-based Mac
·
A Microsoft
Windows installation media or disk image (ISO) containing a 64-bit version
of Microsoft Windows 7 or later
Read more about system requirements to find out whether your Mac supports installing a specific version of Windows, or to learn about installing older versions of Windows. If you’re installing Windows for the first time, use a full installation (not an upgrade) disc or disk image.
Read more about system requirements to find out whether your Mac supports installing a specific version of Windows, or to learn about installing older versions of Windows. If you’re installing Windows for the first time, use a full installation (not an upgrade) disc or disk image.
·
An Apple keyboard,
mouse, or track pad, or a USB keyboard and mouse
·
At least 55
GB of free disk space on your startup drive
·
For most Mac
models, you also need a blank 16 GB or larger USB flash drive.
Install and Open Boot Camp Assistant
Connect a blank USB flash drive
Format your Windows Partition
When you complete the assistant, Mac restarts to the Windows installer. When you’re
asked where you want to install Windows, select the BOOTCAMP partition, then click Format.This step is only required if you’re using a flash drive or optical drive to install Windows. In all other cases, the correct partition is selected and automatically formatted for you..
Install Windows and Restart your
Computer
After Windows is installed, you can switch between macOS and Windows. Use the Startup Disk preference pane in macOS, or the Boot Camp system tray item in Windows to select your startup disk, then restart your computer.
Boot Camp comes with your Mac and lets you install Microsoft Windows. No need to download anything yourself — just open Boot Camp Assistant and it will guide you through the rest.
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