Gray NeckHat. Encryption Algorithms Explained. Google Hacks. Tara Calishain. Hack Attacks Revealed. John Chirillo. Hack Proofing Your Network.
Ryan Russell. Hack Proofing Your Network — 2 Edition. Hack Proofing Your Web Server. Erik Petersen. Hack The Net. Hendri Dudor. Hackers Survival Guide. Abbie Hoffman. So, Hacking Revealed is another best Hacking book that you can read right now. The book contains lots of valuable information that could help you understand dozens of things related to ethical hacking. Ethical Hacking for Beginners is for those searching for an introductory book to learn about the practices of ethical hacking.
The book has lots of guides that could help you understand how Linux works and utilizes terminal directions. For beginners, the book also offers step-by-step techniques and tips for the simple hacking process. Well, if you are searching for a book to get valuable information on various forms of security like IT Security, Data Security, Network Security, Internet Security, etc.
Free Ethical Hacking study materials. List of Best Hacking eBooks Free Download in PDF I have selected these hacking E-books based on their popularity and user opinions, so look at each and download the ebooks you like. Note: These hacking ebooks are only for ethical knowledge purposes and must not be used for illegal purposes.
In this course, you will start as a beginner without or with low knowledge about Hacking, Cybersecurity, and Linux. This course is based on the latest tools and complete practical base. They operate without the permissions or knowledge of the computer users. Trojans hide themselves in healthy processes.
However we should underline that Trojans infect outside machines only with the assistance of a computer user, like clicking a file that comes attached with email from an unknown person, plugging USB without scanning, opening unsafe URLs. Hackers can use these backdoors to access a victim system and its files. A hacker can use Trojans to edit and delete the files present on a victim system, or to observe the activities of the victim.
These are called Trojan-Banker. These are Ransomware Trojans. These are called SMS Trojans. Trojan Information If you have found a virus and want to investigate further regarding its function, then we will recommend that you have a look at the following virus databases, which are offered generally by antivirus vendors.
It is done in order to bypass the password authentication which is normally the start of a session. For sniffing, we use tools like Wireshark or Ethercap.
When the hacker discovers the IP of one of the users, he can put down the connection of the other user by DoS attack and then resume communication by spoofing the IP of the disconnected user. Or, you should use double authentication techniques to keep the session secured.
It works by using the following three techniques which are email spoofing, social engineering tools, or inserting viruses in a user computer. Email Spoofing In email spoofing, the spammer sends emails from a known domain, so the receiver thinks that he knows this person and opens the mail. Such mails normally contain suspicious links, doubtful content, requests to transfer money, etc. Social Engineering Spammers send promotional mails to different users, offering huge discount and tricking them to fill their personal data.
You have tools available in Kali that can drive you to hijack an email. See the following screenshot. Inserting Viruses in a User System The third technique by which a hacker can hijack your email account is by infecting your system with a virus or any other kind of malware. With the help of a virus, a hacker can take all your passwords. How to detect if your email has been hijacked? Ethical Hacking — Password Hacking Ethical 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.
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. 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. 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.
It is available again in Kali distribution. Ethical Hacking — Wireless Hacking Ethical Hacking A wireless network is a set of two or more devices connected with each other via radio waves within a limited space range. The devices in a wireless network have the freedom to be in motion, but be in connection with the network and share data with other devices in the network.
One of the most crucial point that they are so spread is that their installation cost is very cheap and fast than the wire networks. Wireless networks are widely used and it is quite easy to set them up. They use IEEE A wireless router is the most important device in a wireless network that connects the users with the Internet.
In a wireless network, we have Access Points which are extensions of wireless ranges that behave as logical switches. A hacker can sniff the network packets without having to be in the same building where the network is located. As wireless networks communicate through radio waves, a hacker can easily sniff the network from a nearby location. Most attackers use network sniffing to find the SSID and hack a wireless network.
When our wireless cards are converted in sniffing modes, they are called monitor mode. Kismet Kismet is a powerful tool for wireless sniffing that is found in Kali distribution. First of all, open a terminal and type kismet. Start the Kismet Server and click Yes, as shown in the following screenshot. As shown here, click the Start button. The following screenshot shows how it would appear: NetStumbler NetStumbler is another tool for wireless hacking that is primarily meant for Windows systems.
You just have to click the Scanning button and wait for the result, as shown in the following screenshot. It utilizes encryption at the data link layer which forbids unauthorized access to the network. The key is used to encrypt the packets before transmission begins. An integrity check mechanism checks that the packets are not altered after transmission.
Note that WEP is not entirely immune to security problems. It can be found in the Kali distribution of Linux. The following screenshot shows how we have sniffed a wireless network and collected packets and created a file RHAWEP Then we run it with aircrack-ng to decrypt the cypher.
The first type of DoS is Physical Attack. This type of attack is very basic and it is in the base of radio interferences which can be created even from cordless phones that operate in 2. Another type is Network DoS Attack. As the Wireless Access Point creates a shared medium, it offers the possibility to flood the traffic of this medium toward the AP which will make its processing more slow toward the clients that attempt to connect.
Such attacks can be created just by a ping flood DoS attack. Example 1 You must have noticed old company documents being thrown into dustbins as garbage. Many companies still use carbon paper in their fax machines and once the roll is over, its carbon goes into dustbin which may have traces of sensitive data. Although it sounds improbable, but attackers can easily retrieve information from the company dumpsters by pilfering through the garbage.
Example 2 An attacker may befriend a company personnel and establish good relationship with him over a period of time. This relationship can be established online through social networks, chatting rooms, or offline at a coffee table, in a playground, or through any other means. The attacker takes the office personnel in confidence and finally digs out the required sensitive information without giving a clue. Example 3 A social engineer may pretend to be an employee or a valid user or an VIP by faking an identification card or simply by convincing employees of his position in the company.
Such an attacker can gain physical access to restricted areas, thus providing further opportunities for attacks. Example 4 It happens in most of the cases that an attacker might be around you and can do shoulder surfing while you are typing sensitive information like user ID and password, account PIN, etc.
Phishing Attack A phishing attack is a computer-based social engineering, where an attacker crafts an email that appears legitimate. Such emails have the same look and feel as those received from the original site, but they might contain links to fake websites. If you are not smart enough, then you will type your user ID and password and will try to login which will result in failure and by that time, the attacker will have your ID and password to attack your original account.
Otherwise you might end up as a victim of Phishing. Unlike a Denial of Service DoS attack, in which one computer and one Internet connection is used to flood a targeted resource with packets, a DDoS attack uses many computers and many Internet connections, often distributed globally in what is referred to as a botnet.
A large scale volumetric DDoS attack can generate a traffic measured in tens of Gigabits and even hundreds of Gigabits per second. We are sure your normal network will not be able to handle such traffic. What are Botnets? Attackers build a network of hacked machines which are known as botnets, by spreading malicious piece of code through emails, websites, and social media.
Once these computers are infected, they can be controlled remotely, without their owners' knowledge, and used like an army to launch an attack against any target. Due to the distributed nature of these machines, they can be used to generate distributed high traffic which may be difficult to handle.
It finally results in a complete blockage of a service. Here, an attacker tries to saturate the bandwidth of the target site. The attack magnitude is measured in Bits per Second bps. Specialized firewalls can be used to filter out or block malicious UDP packets.
This type of attack can consume both outgoing and incoming bandwidth and a high volume of ping requests will result in overall system slowdown. This type of attack consumes actual server resources and other resources like firewalls and load balancers.
The attack magnitude is measured in Packets per Second. To reduce the effect of SYN floods, you can reduce the timeout until a stack frees memory allocated to a connection, or selectively dropping incoming connections using a firewall or iptables. IP allows sending 65, bytes packets but sending a ping packet larger than 65, bytes violates the Internet Protocol and could cause memory overflow on the target system and finally crash the system.
Here the goal is to crash the web server. The attack magnitude is measured in Requests per Second. It is really difficult to detect Layer 7 attacks because they resemble legitimate website traffic. The targeted server keeps each of these false connections open and eventually overflows the maximum concurrent connection pool, and leads to denial of additional connections from legitimate clients. These are new type of attacks coming into existence day by day, for example, exploiting vulnerabilities for which no patch has yet been released.
Your DDoS protection starts from identifying and closing all the possible OS and application level vulnerabilities in your system, closing all the possible ports, removing unnecessary access from the system and hiding your server behind a proxy or CDN system. But if you have high volume of DDoS attack like in gigabits or even more, then you should take the help of a DDoS protection service provider that offers a more holistic, proactive and genuine approach.
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