Data encryption basics in Unity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new AES encryption object.

Unity

using System.Security.Cryptography;

Aes aes = Aes.[1]();

Drag options to blanks, or click blank then click option'

ACreate

BCreateEncryptor

CGenerateKey

DGenerateIV

Attempts:

3 left

💡 Hint

Common Mistakes

Using CreateEncryptor() instead of Create()

Trying to generate key or IV directly without creating AES object

The Aes.Create() method creates a new AES encryption object.

2fill in blank

medium

Complete the code to generate a random encryption key.

Unity

using System.Security.Cryptography;

Aes aes = Aes.Create();
aes.[1]();

Drag options to blanks, or click blank then click option'

AGenerateKey

BDispose

CGenerateIV

DCreateEncryptor

Attempts:

3 left

💡 Hint

Common Mistakes

Calling GenerateIV() instead of GenerateKey()

Calling CreateEncryptor() before generating key

The GenerateKey() method creates a new random key for encryption.

3fill in blank

hard

Fix the error in the code to create an encryptor with the AES key and IV.

Unity

using System.Security.Cryptography;

Aes aes = Aes.Create();
aes.GenerateKey();
aes.GenerateIV();
ICryptoTransform encryptor = aes.[1](aes.Key, aes.IV);

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AGenerateKey

BCreateEncryptor

CGenerateIV

DCreateDecryptor

Attempts:

3 left

💡 Hint

Common Mistakes

Using CreateDecryptor instead of CreateEncryptor

Calling GenerateKey or GenerateIV instead of creating encryptor

The CreateEncryptor(key, iv) method creates an encryptor using the AES key and IV.

4fill in blank

hard

Fill both blanks to encrypt data using the encryptor and a CryptoStream.

Unity

using System.IO;
using System.Security.Cryptography;

byte[] data = new byte[] {1, 2, 3};
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, encryptor, [1]);
cs.[2](data, 0, data.Length);

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ACryptoStreamMode.Write

BCryptoStreamMode.Read

CWrite

DRead

Attempts:

3 left

💡 Hint

Common Mistakes

Using CryptoStreamMode.Read instead of Write

Calling Read() instead of Write() on CryptoStream

To encrypt data, use CryptoStreamMode.Write and call Write() on the CryptoStream.

5fill in blank

hard

Fill all three blanks to decrypt data using a decryptor and CryptoStream.

Unity

using System.IO;
using System.Security.Cryptography;

byte[] encryptedData = new byte[] {5, 6, 7};
MemoryStream ms = new MemoryStream(encryptedData);
ICryptoTransform decryptor = aes.[1](aes.Key, aes.IV);
CryptoStream cs = new CryptoStream(ms, decryptor, [2]);
byte[] decrypted = new byte[encryptedData.Length];
cs.[3](decrypted, 0, decrypted.Length);

Drag options to blanks, or click blank then click option'

ACreateDecryptor

BCryptoStreamMode.Read

CRead

DCreateEncryptor

Attempts:

3 left

💡 Hint

Common Mistakes

Using CreateEncryptor instead of CreateDecryptor

Using CryptoStreamMode.Write instead of Read

Calling Write() instead of Read() on CryptoStream

To decrypt data, create a decryptor with CreateDecryptor, use CryptoStreamMode.Read, and call Read() on the CryptoStream.