If the files of your users contain sensitive information, you can encrypt it so that no one can open that file but the user itself. Encrypting your files makes them difficult for anyone to access and read without your password. If you're into the encryption theme in your project, we'll show you in this article how to encrypt and decrypt files using the AES algorithm easily. Youtube video downloader for mac online.
Note
The Advanced Encryption Standard (AES), also known by its original name Rijndael (Dutch pronunciation: ˈrɛindaːl), is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001. AES is a subset of the Rijndael block cipher developed by two Belgian cryptographers, Vincent Rijmen and Joan Daemen, who submitted. Symmetric Ciphers Online allows you to encrypt or decrypt arbitrary message using several well known symmetric encryption algorithms such as AES, 3DES, or BLOWFISH. Symmetric ciphers use the same (or very similar from the algorithmic point of view) keys for both encryption and decryption of a message.
This article shows you a way to encrypt and decrypt easily and quickly files using simple methods like encrypt and decrypt. They're the result of a recopilation of information from different sources as Stack Overflow, Security Exchange and the official MSDN website.
![Aes Aes](/uploads/1/2/6/4/126464539/800428781.jpg)
![Aes File Encryption Aes File Encryption](/uploads/1/2/6/4/126464539/111452642.png)
1. Import required types
In order to handle the AES encryption algorithm on your project to encrypt and decrypt files, import the 2 following required types:
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The reference to InteropServices in the top of your class will allow you to use later the
DllImport
method in our class.File Encryption Windows
2. Create encryption and decryption methods
Aes Online File Encryption
You will need to add the following 3 methods to your class (or create them in a new class and then import them in yours):
GenerateRandomSalt
: this method creates a random salt. This function is customizable and you can modify it to create your own salt if you need to.FileEncrypt
: this method encrypts an existent file with a plain password.FileDecrypt
: this method decrypts a previously encrypted file with the FileEncrypt method using the plain password as argument.ZeroMemory
: this method will be used to remove the password from the memory, increasing the security of the encryption. It's not necessary, however recomendable to use.
The method will be used and explained in the step #3, for now, copy and include the methods in your project:
They're not necessarily perfect and they can (and need to) be modified to handle more exceptions in case they appear and how you work with your application.
3. Using the methods
From the required methods, you will only need to use 2 of them (FileEncrypt and FileDecrypt) obviously and 1 of them optional, the fourth (GenerateRandomSalt) is used internally by the
FileEncrypt
method.Encrypt File
Aes Password Decrypt
Encrypt a file using the FileEncrypt method that expects as first argument the path to the file that will be encrypted and as second argument the password that will be used to encrypt it. The password can be used to decrypt the file later. To make everything right, we recommend you to delete the password from the memory using the ZeroMemory method. Call this function to remove the key from memory after use for security purposes:
The
FileEncrypt
method will generate a file in the same directory of the original file with the aes
extension (e.g wordFileExample.doc
).Decrypt File
To decrypt the file, we'll follow the same process but using FileDecrypt instead. This method expects as first argument the path to the encrypted file and as second argument the path where the decrypted file should be placed. As third argument you need to provide the string that was used to encrypt the file originally:
Final notes
- The encryption/decryption process is memory consumming and take time so it's recommendable to run those tasks in another thread to prevent your main UI from freezing.
- The extension
aes
can be changed for the extension that you want.
File Encryption Gnu
Happy coding !