Security in C#.NET

Creation QR Code in C#.NET Security

Security
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For more information about CryptoAPI, see the Microsoft Platform SDK link on the Web Resources page at http://www.microsoft.com/windows/reskits /webresources. For more information about Data Protection API, see the Technet link on the Web resources page at http://www.microsoft.com/windows/reskits/webresources. Caution
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The RSA folder must never be renamed or moved. This is the only place the CSPs look for private keys. If you need additional protection for this folder, the administrator can provide additional file system security for users computers or use roaming profiles.
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Master Key Storage and Security
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The Data Protection API automatically encrypts the user s master key or keys. Master keys are stored in the user profile under RootDirectory\Documents and Settings\username\Application Data\Microsoft\Protect. For a domain user who has a roaming profile, the master key is located in the user s profile and is downloaded to the user s profile on the local computer until the computer is restarted. While the user is logged on, when a master key is not being used for a cryptographic operation, it is encrypted and stored on disk. Before master keys are stored, they are 3DESencrypted using a key derived from the user s password. When a user changes his or her logon password, master keys are automatically unencrypted and re-encrypted using the new password.
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Master Key Loss and Data Recovery
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If a logon password is forgotten or if an administrator resets a user password, the user s master keys become inaccessible. Because the decryption key is derived from the user s password, the system is unable to decrypt the master keys. Without the master keys, EFS-encrypted files are also inaccessible to the user and can be recovered only by a data recovery agent, if one has been configured, or through the use of a password reset disk (PRD), if one has been created. For more information, see article 290260, EFS, Credentials, and Private Keys from Certificates Are Unavailable After a Password Is Reset, in the Microsoft Knowledge Base at http:// support.microsoft.com. Note
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The password reset disk feature is available for local accounts only. Domain account passwords cannot be backed up by using a PRD.
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For example, Alice uses EFS on her stand-alone computer to encrypt her private files. She forgets her password but remembers the password for the built-in administrator account. She logs on as the administrator and resets the password for her account named Alice. When she resets the password, she is able to log on as Alice, but files that she encrypted as Alice are inaccessible because the master keys are inaccessible.
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18:
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Using Encrypting File System
Alice can recover her encrypted data in two ways. First, if a data recovery agent was configured for Alice s computer before she encrypted the files, the data recovery agent (DRA) can recover the files. Second, even without a DRA, if Alice created a PRD before she lost or reset her password, she can use the PRD to safely change her password and recover her data.
Password Reset Disk Creation
PRDs protect against loss of access to master keys and encrypted files on stand-alone computers. Users can create PRDs for their own user accounts. When a user creates a PRD, the system creates a public-private key pair and a self-signed certificate. The user s password is encrypted by using the public key and stored locally in the registry at HKEY_LOCAL_MACHINE \SECURITY\Recovery\<user SID>. The private key is exported to a removable media and deleted from the local computer. To create a password reset disk for your user account 1. In Control Panel, click User Accounts. 2. Click your user account. 3. Under Related Tasks, select Prevent a forgotten password. This starts the Forgotten Password Wizard. 4. On the Welcome screen, click Next. 5. Select the removable drive on which you would like to store your password key, and then click Next. 6. Enter your current password, and click Next. If you have created a PRD and you forget your password or enter the wrong password, you will be prompted with the following message: Did you forget your password You can use your password reset disk. You can then use the Password Reset Wizard to reset your password. The system will do the following: 1. Use the private key stored on the PRD to decrypt the stored copy of your old password. 2. Create a decryption key based on an SHA-1 hash of your old password. 3. Decrypt your master keys by using the decryption key. 4. Prompt you for a new password. 5. Encrypt master keys by using your new password. To use the PRD to reset your password 1. At the logon screen, click Use your password reset disk to start the Password Reset Wizard and then click Next. 2. Insert the removable media that contains your password key, and then click Next. 3. Enter your new password in the Reset the User Account Password dialog box, and then click Next.
Part III:
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