create barcode with c# Authentication tab on the Local Area Connection Properties sheet in Visual C#

Encoder QR in Visual C# Authentication tab on the Local Area Connection Properties sheet

Authentication tab on the Local Area Connection Properties sheet
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Part IV:
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Networking
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Figure 25-5
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Smart Card or other Certificate Properties dialog box
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Certificates are validated by verifying the digital signature by means of a public key. The public key is contained in a trusted authority root certificate of the certification authority that issued the certificate. These root certificates are the basis for certificate verification and are supplied only by a system administrator. Smart cards A smart card is a credit card sized device that is inserted into a smart card reader, which is either installed internally in your computer or connected externally to your computer. Certificates can reside either in the certificate store on your computer or on a smart card. When setting the security options of a connection, you can use a smart card or other certificate, and you can specify particular certificate requirements. For example, you can specify that the server s certificate must be validated. When you double-click New Connection in the Network Connections folder, if a smart-card reader is installed, Windows XP Professional detects it and prompts you to use it as the authentication method for the connection. If you decide not to use the smart card at the time you create a connection, you can later modify the connection to use another certificate or authentication method.
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How the Remote Access Authentication Process Works
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Your computer dials a remote access server. Depending on the authentication methods you have chosen, one or more of the following might happen:
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If you are using PAP or SPAP: 1. Your computer sends its password as plaintext (PAP) or using two-way encryption (SPAP) to the server. 2. The server checks the account credentials against the user database.
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25:
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Connecting Remote Offices
If you are using CHAP or MS-CHAP: 1. The server sends a challenge to your computer. 2. Your computer sends an encrypted response to the server. 3. The server checks the response against the user database.
If you are using MS-CHAPv2: 1. The server sends a challenge to your computer. 2. Your computer sends an encrypted response and a challenge to the server. 3. The server checks the response against the user database and sends back an encrypted challenge response. 4. Your computer verifies the encrypted challenge response.
If you are using certificate-based authentication: 1. The server requests credentials from your computer and sends its own computer certificate. 2. If you configured your connection to Validate server certificate, it is validated. If not, this step is skipped. 3. Your computer presents its user certificate to the server. 4. The server verifies that the user certificate is valid and that it has not been revoked.
If the account is valid and permitted through the dial-up properties of the user account and remote access policies, the server authorizes the connection. If the connection is authorized, the server accepts your connection. If callback is enabled, the remote access server calls your computer back and repeats the authentication process.
Note
If you are using an L2TP-enabled VPN connection, IP Security (IPSec) performs a computer-level authentication and provides encryption before any of these steps take place. For more information about IPSec, see Data Encryption later in this chapter.
Data Encryption
Think of data encryption as a key you use to lock valuables in a strong box. Sensitive data is encrypted by using a key algorithm, which renders the data unreadable without the key. Data encryption keys are determined when your computer connects to the computer on the other end. Data encryption can be initiated by your computer or by the server to which you are connecting. For dial-up, VPN and direct connections, Network Connections supports two types of encryption: Microsoft Point-to-Point Encryption (MPPE), which uses Rivest-Shamir-Adleman (RSA)
Part IV:
Networking
RC4 encryption, and an implementation of Internet Protocol security (IPSec) that uses Data Encryption Standard (DES) encryption. Both MPPE and IPSec support multiple key strengths for encryption. Server controls are flexible. They can be set to deny the use of encryption or require a specific encryption strength. By default, most servers are set to allow encryption and allow clients to choose their encryption strength. The system administrator can set encryption requirements on a Windows 2000 or Windows Server 2003 remote access server or VPN server by using the encryption settings on the profile of a remote access policy. The encryption method used by a VPN connection depends on the type of protocol used by the server to which it connects. If the VPN connection is using PPTP, MPPE is used. If the VPN connection is using L2TP, IPSec encryption methods and strengths are used. If the VPN connection is configured for an automatic server type (which is the default selection), PPTP is attempted first, followed by L2TP.
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