Domain 9 of CEH: Cryptography

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Domain 9 of CEH Cryptography
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• Domains of CEH
• Information Security and Ethical Hacking
  Overview-6
• Reconnaissance Techniques-21
• System hacking phases and Attack Techniques-17
• Network and perimeter hacking-14
• Web application hacking-16
• Wireless network hacking-6
• Mobile platform, IoT, and OT hacking-8
• Cloud Computing-6
• Cryptography-6

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We will discuss the ninth domain of CEH, which is
Cryptography. What is cryptography? Cryptograph
y is a technique through which we can convert
plain text into ciphertext and can convert the
ciphertext into plain text. Didnt get my point?
No worries! Let me give you a simple example.




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Assume there are two friends staying in different
corners of the world. And, one of them (lets say
Bob) is sending a piece of confidential
information to another (lets say, Alexa). Now,
in between, some attackers may access this
information to avoid this by Using a key, Bob may
convert the plain text (original message) into
ciphertext (a combination of random numbers and
alphabets). Now, even if the attacker finds the
message, he will not understand it. And finally,
after receiving the message, Alexa can use the
key to convert the ciphertext into plaintext.
This entire process of converting the texts to
maintain their secrecy is called cryptography.




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As shown in the figure, the original message is
1065256 this message is applied to an encryption
key. This key is used in the encryption algorithm
by which the message is converted in a ciphertext
(unreadable format), This ciphertext will be sent
across the network to the other end of the world.
The other person for whom the message is sent
will use a decryption key and ciphertext as a
parameter of the decryption algorithm and get the
original message (1065256). Keys? What keys? Is
this your question? Then go further.
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• Keys
• In cryptography, keys are strings of characters
  (combinations of letters, numbers, and symbols)
  used in an encryption algorithm for altering data
  so that it appears random. Just like physical
  keys, these keys also lock (encrypt) the data,
  and only someone with the correct key can unlock
  (decrypt) the data.
• Objectives of cryptography
• Cryptography concentrates on four different
  objectives.
• Non-repudiation This term refers to a message
  that can never be retracted by the sender or
  taken back.
• Confidentiality Private communications are
  protected by confidentiality, ensuring the
  intended recipient can only read the message
  after it has been decrypted.
• Authenticity Authenticity helps ensure that both
  senders and recipients can verify each others
  identities and that the intended recipients have
  received the message.
• Integrity Integrity is the ability to ensure
  that the information in a message cannot be
  modified while it is being stored or transported.

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Types of Cryptography Symmetric key
cryptography Symmetric key cryptography or
symmetric encryption is an algorithm for
cryptography that utilizes the same cryptographic
key for both the plaintexts encryption plus the
ciphertexts decryption. The keys may be related,
or there may be a slight variation between the
two keys.




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Asymmetric key cryptography Asymmetric
cryptography, also called public-key
cryptography, is a process that encrypts and
decrypts a message with two related keys, one
public and one private, to prevent unauthorized
access or use of confidential information.




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• The importance of cryptography
• Privacy Whether we are talking about the digital
  or physical worlds, privacy is all we care about.
  Im not sure about the physical world, but
  cryptography can give us privacy in the digital
  universe. By encrypting our data, we ensure that
  only legitimate users can view it, and hackers,
  cybercriminals, internet providers, and even
  government agencies cannot access our data.
• Authentication In cryptography, we scramble our
  original data using a random passcode, called an
  encryption key, in order to protect it. Using
  this key eliminates the possibility that others
  will access your data. Sometimes hackers pretend
  to be authorized users in order to gain access.
  So, making the encryption key authenticated will
  protect your data.

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CEH with InfosecTrain InfosecTrain is one of the
leading training providers with a pocket-friendly
budget. We invite you to join us for an
unforgettable journey with industry experts to
gain a better understanding of the Certified
Ethical Hacker course. Courses can be taken as
live instructor-led sessions or as self-paced
courses, allowing you to complete your training
journey at your own convenience.




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About InfosecTrain

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