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 CHAPTER 1  MODULES, COMMENTS, PIP   MODULES:                                 A module is a file containing code written by somebody else which can be imported and used in our programme. Types of modules: Build in modules: preinstalled in python  External modules: need to install using pip.               Pip is the package manager for python you can use pip to install a module on your system.  PIP : COMMENTS:                                 Comments are used to write something which the programmer dose not want to execute. Types of comments: Single line comment written using # (hash) multi line comments written using (" 123")

  CRYPTOGRAPHY TOPICS: What is cryptography? Classification of cryptography? How various cryptographic algorithms work?       1. WHAT IS CRYPTOGRAPHY? as you see in the picture first we write a word or paragraph, or the thing we need to encrypt .  and then the  software make 2 keys 1) Receiver's key public key                                                                    2)  Private key sender sends the message of form public key and  the receiver uses the Private key to unencrypt the message of the sender . (As the hackers and normal users only see a useless message and cant unencrypt it .But the owner of private key can see the real text or message .) 2. CLASSIFICATION OF CRYPTOGRAPHY. Symmetric key cryptography: An encryption system in wh...