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Object-Oriented Programming – Terminology
Click on the picture below to check your knowledge of key Object-Oriented Programming concepts: Classes & Objects, Inheritance, Encapsulation, Polymorphism and Abstract Classes.
Object-Oriented Programming – Quiz
Before taking this quiz, make sure you are confident with your understanding of key Object-Oriented Programming concepts. Take the Quiz! (open full screen) List of Keywords If you are stuck and need a clue, you can reveal below the list…
Object-Oriented Programming Concepts
Object-Oriented Programming (OOP) is a programming approach based on objects and classes. The object-oriented paradigm allows us to organise software as a collection of objects that consist of both data/attributes and behaviours. This programming concept appeared in the 1980s and…
Symmetric vs. Asymmetric Encryption
Cryptography is the art of encoding and decoding secret messages. Cryptographic techniques have been used for thousands of years, well before the introduction of computers, and the techniques have evolved since. (e.g. See how the Caesar Cipher was used by…
Epoch/Unix Timestamp Converter
The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight GMT). This explains how date & time values are actually stored on computers: using an…
Hashing Algorithms for Integrity Validation
Imagine working for the British Secret Services during World War 2 or during the cold war. As part of your role, you would be expected to exchange secret messages with your allies. Your messages would most likely be encrypted using…
Hashing Algorithms for Storing Sensitive Data
More and more online systems such as e-commerce websites, online banking apps, or social networks need to access some sensitive data about you including your password, your credit card details and more recently, some biometric data (e.g. for fingerprint authentication…
Hashing Algorithms for Memory Addressing
In this blog post, we will investigate the use of hashing algorithms to quickly locate a record in a large database. Let’s consider the database of members of a social network such as Instagram, Twitter or Facebook. Every time the…
Recursive vs. Iterative Palindrome Check
For this challenge we will investigate two algorithms used to find out if a word is a palindrome or not. The first algorithm will use an iterative approach, the second algorithm will use a recursive approach. Iterative Approach An iterative…
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