Passkey Management System

The Passkey Management System is a command-line program designed to provide users with a secure way to generate, store, search, modify, and delete passkeys for different websites or accounts. It employs a combination of randomly generated characters, including letters (both uppercase and lowercase), numbers, and symbols, to create strong and secure passkeys.

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Features:

1. Add a Passkey:

   • Allows users to add a new passkey by entering their username, email address, and the website associated with the passkey.
   • Generates a secure passkey and displays it to the user.
   • Appends the user's information along with the passkey to the records file.

2. Search for a Passkey:

   • Enables users to search for a previously stored passkey using their email address and the associated website.
   • Displays the found user data, including the username, email address, website, and passkey.

3. Modify a Passkey:

   • Permits users to modify an existing passkey by entering their email address and the associated website.
   • Provides options to generate a new passkey or enter a custom passkey.
   • Updates the records file with the modified passkey.
   • Displays a message if the data is not available.

4. Delete a Passkey:

   • Allows users to delete a stored passkey by entering their email address and the associated website.
   • Clears the specified user data from the records file.
   • Displays a message if the data is not available.

5. Display All Records:

   • Displays all user data stored in the "records.txt" file.
   • Provides an option to return to the main menu.

6. Exit:

   • Exits the program.

Functions:

• randomNum: Generates a random number between specified min and max values.
• shuffle: Implements the Fisher-Yates shuffle algorithm for shuffling characters in a key.
• setKey: Generates a passkey and shuffles it based on specified criteria.
• appendData: Appends user data to the file.
• searchData: Searches for user data in the file based on email ID and website.
• modifyData: Modifies user data in the file, allowing users to change passkeys.
• clearData: Clears user data from the file based on email ID and website.
• clearFile: Clears the entire content of the file.
• isEmpty: Checks if the file is empty.
• displayData: Displays all user data from the file.
• toLower: Converts a string to lowercase.
• clearConsole: Clears the console screen.

Implementation Details:

• Passkeys are generated using a mix of lowercase and uppercase letters, numbers, and symbols for enhanced security.
• Passkeys are shuffled using the Fisher-Yates shuffle algorithm.
• User data, including usernames, email addresses, websites, and passkeys, is stored in a text file ("records.txt").
• The program utilizes dynamic memory allocation for storing and manipulating user data.
• To ensure data integrity, modifications and deletions are performed using temporary files.

Usage Instructions:

1. Run the program, and a menu will be displayed with options to perform various tasks.
2. Follow on-screen prompts to add, search, modify, delete, or display passkeys.
3. Exit the program when done.

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