Q.5 By using the CrypTool do the DES ECB and CBC encryption by using any text or
ID: 3910045 • Letter: Q
Question
Q.5 By using the CrypTool do the DES ECB and CBC encryption by using any text or file with the key 64 bit 1s (FF FF FF FF FF FF FF FF) (this is Hexadecimal representation And encrypt again the resulted ciphertext with the same key used for the first encryption. What do you get? Are there any other keys that might have the same effect? Please give your answers. Q.6 Microsoft's Encrypting File System (EFS) is a cryptography system for windows operating system that uses the Windows NTFS file system. Search and find how to turn on and use EFS As an alternative to EFS, is BitLocker. Search and find how to turn on and use BitLocker. Based on your experiences with BitLocker and EFS which do you prefer? Why? What advantages do you see for both applications?Explanation / Answer
Hello Sir/Madam
5)ECB:
Input type: Text
Input :Cheg experts
Function:DES
Mode:ECB
Key: FF FF FF FF FF FF FF FF
Cipher Text:fd 83 3d 67 8e 45 a9 98 a4 98 11 7b 10 9c 11 80 ý . = g . E © ¤ . { . . .
CBC:
Input type: Text
Input :Cheg experts
Function:DES
Mode:CBC
Key: FF FF FF FF FF FF FF FF
Cipher Text: 28 64 58 83 89 74 be f7 8f bd 26 17 e0 0c 5b 4e ( d X . . t ¾ ÷ ½ & . à . [ N
Input type: Text
Input :28 64 58 83 89 74 be f7 8f bd 26 17 e0 0c 5b 4e ( d X . . t ¾ ÷ ½ & . à . [ N
Function:DES
Mode:CBC
Key: FF FF FF FF FF FF FF FF
Cipher Text: 28 64 58 83 89 74 be f7 8f bd 26 17 e0 0c 5b 4e ( d X . . t ¾ ÷ ½ & . à . [ N
In symmetric encryption is it possible for any other key to produce the same ciphertext.
6)
Encrypting File System (EFS) is an encryption service found on only Windows 10 Pro, Enterprise, and Education.
EFS allows you to encrypt individual files and folders.
Encryption is local to the PC user, so if a different user is logged in , those files will remain inaccessible.
EFS encryption isn't as secure as other encryption methods, like BitLocker, because the key that unlocks the encryption is saved locally.
There's also a scope that data can leak into temporary files since the entire drive is not encrypted.
Even if it is not that much secure EFS is a quick and easy way to protect individual files and folders on a PC that's shared amongst several users.
Encrypting with EFS doesn't take long
Once you've encrypted a file or folder, Windows will automatically remind you that you should create a backup key in case you run into a problem where you can no longer log into your user account that's tied to the encrypted files.
This requires some sort of removable media like USB thumb drive.
Here are the steps to use EFS
1)Launch File Explorer from your Start menu, desktop, or taskbar.
2)Right-click a file or folder.
3)Click Properties.
4)Click Advanced.
5)Click the checkbox next to Encrypt contents to secure data.
6)Click OK.
7)Click Apply. A window will pop up asking you whether or not you want to only encrypt the selected folder, or the folder, subfolders, and files.
8)Click either Apply changes to this folder only or Apply changes to this folder, subfolders, and files
9)click ok
Bitlocker:
1)Use the Windows key + X keyboard shortcut to open the Power User menu and select Control Panel.
2)Click System and Security.
3)Click BitLocker Drive Encryption.
4)Under BitLocker Drive Encryption, click Turn on BitLocker.
5)Choose how you want to unlock your drive during startup: Insert a USB flash drive or Enter a password. For the purpose of the guide, select Enter a password to continue.
6)Enter a password that you'll use every time you boot Windows 10 to unlock the drive, and click Next to continue.
7)You will be given the choices to save a recovery key to regain access to your files in case you forget your password. Options include:
Save to your Microsoft account
Save to a USB flash drive
Save to a file
Print the recovery
Select the option that is most convenient for you, and save the recovery key in a safe place.
8)Click Next to continue.
9)Select the encryption option that best suits your scenario:
10)Encrypt used disk space only (faster and best for new PCs and drives)
11)Encrypt entire drive (slower but best for PCs and drives already in use)
12)Choose between the two encryption options:
New encryption mode (best for fixed drives on this device)
Compatible mode (best for drives that can be moved from this device)
13)Click Next to continue.
14)Make sure to check the Run BitLocker system check option, and click Continue.
Finally, restart your computer to begin the encryption process.
On reboot, BitLocker will prompt you to enter your encryption password to unlock the drive. Type the password and press Enter.
Bitlocker is quite better than EFS:
Here is the major differences between BitLocker Drive Encryption and the Encrypting File System.
BitLocker is designed to protect all of the personal and systems files on the drive Windows is installed on
in the case of your computer is stolen,or if any unauthorized access to the computer.
EFS is used to help protect individual files on any drive on a per-user basis.
BitLocker vs. Encrypting File System (EFS):
BitLocker encrypts all personal and system files on the drive where Windows is installed, or on data drives on the same computer.
EFS encrypts individual files on any drive.
BitLocker does not depend on the individual user accounts associated with files. BitLocker is either on or off, for all users or groups.
EFS encrypts files based on the user account associated with it. If a computer has multiple users or groups, each can encrypt their own files independently.
BitLocker uses the Trusted Platform Module (TPM), a special microchip in some newer computers that supports advanced security features.
EFS does not require or use any special hardware.
You must be an administrator to turn BitLocker encryption on or off once it's enabled.
You do not have to be an administrator to use EFS.
You can use BitLocker Drive Encryption and the Encrypting File System together to get the protection offered by both features.
When using EFS, encryption keys are stored with the computer's operating system.
While these are encrypted, that level of security could potentially be compromised if a hacker is able to boot or access the system drive.
Using BitLocker to encrypt the system drive can help protect these keys by preventing the system drive from booting or being accessed if it is installed into another computer.
Hope it help and looking forward to help if u have any doubts...
Thank u Sir/Madam
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