🔐 RSA Encryption and Decryption with Binary, Decimal, and Hexadecimal Conversion (WinForms App)

This Windows Forms application provides a simple GUI for RSA encryption and decryption along with conversion tools to view cipher output in binary, decimal, and hexadecimal formats.

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🚀 Features

• ✅ RSA Key Generation (with custom prime inputs p and q)
• ✅ Text Encryption using Public Key (e, n)
• ✅ Text Decryption using Private Key (d, n)
• ✅ View Encrypted Text as:
  • Decimal
  • Binary
  • Hexadecimal
• ✅ Easy-to-use GUI built with Windows Forms (C#)
• ✅ Error handling for invalid input and formats

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🖥️ Technologies Used

• C#
• Windows Forms (.NET 6.0 / .NET Framework)
• RSA Algorithm (simplified for learning/demo purposes)
• System.Text & System.Security.Cryptography

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🔑 How RSA Works Here

1. You enter two prime numbers (p, q) and click Generate Keys.
2. App calculates:
   • Modulus n = p * q
   • Public Key exponent e
   • Private Key exponent d
3. You enter a plaintext message and click Encrypt:
   • The message is encrypted using e and n.
   • Output is shown in decimal form.
   • Can also be converted to binary or hex.
4. You paste or type the cipher into the decryption box and click Decrypt:
   • Cipher is decrypted using d and n to recover the original message.

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🧪 Sample Test

Use the following values to test the encryption/decryption:

p = 61
q = 53

Message: Hello