README.md

Text files encryption using strategy design pattern in C++.

This source code is a template of using the strategy design pattern for text files encryption in C++.
This project is a homework from my college programming teacher.

Problem statement:

Develop the program for encrypting text documents.
The user enters a string containing the path to the text file ("C:/example.txt").
After that, he enters a number from 1 to 3 to clarify the text encryption method.
After the selected algorithm works, the encrypted text is saved to another file ("C:/example_ciphered.txt").
Develop the console application that implements the described functionality and contains a hierarchy of encryption classes.
Justify the selected class hierarchy and the selected design pattern.

Implementation:

A basic virtual class for std::string encryption strategies:

class EncryptionStrategy
{
public:
    virtual std::string encrypt(const std::string &text, const std::string &key = "") = 0;
    virtual std::string decrypt(const std::string &text, const std::string &key = "") = 0;
};

Concrete encryption strategy using XOR:

class XOREncryptionStrategy : public EncryptionStrategy ...

Concrete encryption strategy using Caesar:

class CaesarEncryptionStrategy : public EncryptionStrategy ...

Concrete encryption strategy using Binary code:

class BinaryEncryptionStrategy : public EncryptionStrategy ...

Interface for file encryption using encryption strategies:

class IFileEncryptor ...