🔐 Caesar Cipher CLI

A lightweight command-line Caesar Cipher implementation written in Rust.

A lightweight command-line Caesar Cipher implementation written in Rust.

The project focuses on implementing classical substitution-based cryptography while practicing Rust fundamentals such as functions, string handling, input validation, error-aware input processing, terminal interaction, and external crate usage.

Features

- Caesar Cipher encryption
- Caesar Cipher decryption
- Interactive command-line interface
- Supports uppercase alphabetic messages and spaces
- Shift validation from `0` to `25`
- Empty input validation
- Invalid character detection
- Dynamic terminal-width output box
- `Ctrl+C` interruption handling
- Clean separation between input, validation, and cipher logic

🚀 Sample

┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│                                                CAESAR CIPHER                                                 │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

-> Enter the message: HELLO WORLD
-> Number of shifts: 3

┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│                                            Original : HELLO WORLD                                            │
│                                            Encrypted: KHOOR ZRUOG                                            │
│                                            Decrypted: HELLO WORLD                                            │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────┘