Python for Cyber Security

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Unit 1 of Python for Cyber Security

Python and Networking Foundations

The Python you need to write a real security tool, and the networking you need to understand what that tool does on the wire: variables, lists, dictionaries, functions, classes and files, then IP addresses, ports, TCP and UDP, the three-way handshake, sockets, banner grabbing, a reusable socket server and exception handling.

Learning outcomes

Write Python programs using variables, lists, dictionaries, loops, functions, classes and file input and output
Explain IP addresses, ports, the four-layer TCP/IP model, TCP versus UDP and the three-way handshake
Build TCP and UDP clients and servers with Python sockets and watch the handshake on the wire
Resolve hostnames and grab service banners, and say what a banner does and does not prove
Structure a reusable threaded socket server and write scripts that survive bad input and bad luck

Topics

1.1

Why a Security Professional Learns to Code

The cook and the customer: why a short script beats waiting for a tool to add a feature, and the three properties that make Python the usual choice.

11 min

1.2

Installing and Configuring Python

Check your interpreter, meet the REPL, and give every project its own clean workbench with venv, pip and requirements.txt.

10 min

Assessments

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Unit Assessment

Python and Networking Foundations

20 questions30 minPass: 60%

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Comprehensive Assessment

1.3

Variables, Types and Operators

Variables as labelled boxes, the six types a security script reaches for most, and the operators that split byte streams and test open ports.

10 min

1.4

Lists and Strings: Parsing a Log Line

Lists as a batting order, slicing, f-strings and the five string methods behind almost every log-analysis script.

11 min

1.5

Conditions, Loops and Functions

Indentation as syntax, the night watchman's for and while loops, range for sweeping ports, and functions as recipe cards, ending with the first piece of a port scanner.

14 min

1.6

Classes and Objects

The rubber stamp and its imprints: a class that remembers a scan result, with __init__, self, methods and __str__.

9 min

1.7

Dictionaries, Modules and Packages

The contact book: dictionaries for a scan result, .get() versus square brackets, your own modules, and the __name__ guard.

12 min

1.8

File Handling

The library register: reading targets from a file, writing results as JSON, the five file modes, and why the with statement is the librarian you want.

10 min

1.9

IP Addresses, Ports and the TCP/IP Layers

The office building: an IP address finds the building, a port finds the door, the twelve ports every analyst recognises on sight, and the four layers your data passes through.

12 min

1.10

TCP, UDP and the Three-Way Handshake

Registered post versus the postcard, and the phone greeting that opens every TCP connection: SYN, SYN-ACK, ACK.

14 min

1.11

Sockets: TCP and UDP Clients and Servers

The telephone handset wired to one door: write a TCP client and an echo server, a UDP client and server, and watch the handshake with tcpdump.

15 min

1.12

IP Resolution and Banner Grabbing

The shop signboard: resolve a name to an address, read the greeting a service volunteers, and what Shodan does with that idea across the whole internet.

14 min

1.13

A Reusable Socket Server Framework

A fixed accepting loop plus an interchangeable handler: the threaded server pattern behind honeypots and listeners, and what the 1988 Morris Worm teaches about trusting what arrives on a socket.

13 min

1.14

Exception Handling: Scripts That Do Not Crash

The trapeze net: try, except and finally, the six exceptions a network throws at a script, and why catching bare Exception is a last resort.

14 min

1.15

Unit 1 Quick Reference, Self-Study and Lab

The socket calls on one page, the six self-study questions with worked answers, and the three lab exercises that build your laboratory, an echo server and a banner grabber.

15 min

Python for Cyber Security: Complete Assessment

100 questions120 minPass: 60%

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