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Creating and managing keys is an important part of the cryptographic process. Symmetric algorithms require the creation of a key and an initialization vector (IV). The key must be kept secret from anyone who should not decrypt your data. The IV does not have to be secret, but should be changed for each session. Asymmetric algorithms require the creation of a public key and a private key. The public key can be made public to anyone, while the private key must known only by the party who will decrypt the data encrypted with the public key. This section describes how to generate and manage keys for both symmetric and asymmetric algorithms.
Symmetric Keys
The symmetric encryption classes supplied by the .NET Framework require a key and a new initialization vector (IV) to encrypt and decrypt data. Whenever you create a new instance of one of the managed symmetric cryptographic classes using the parameterless constructor, a new key and IV are automatically created. Anyone that you allow to decrypt your data must possess the same key and IV and use the same algorithm. Generally, a new key and IV should be created for every session, and neither the key nor IV should be stored for use in a later session.
To communicate a symmetric key and IV to a remote party, you would usually encrypt the symmetric key by using asymmetric encryption. Sending the key across an insecure network without encrypting it is unsafe, because anyone who intercepts the key and IV can then decrypt your data. For more information about exchanging data by using encryption, see Creating a Cryptographic Scheme.
The following example shows the creation of a new instance of the TripleDESCryptoServiceProvider class that implements the TripleDES algorithm.
When the previous code is executed, a new key and IV are generated and placed in the Key and IV properties, respectively.
Sometimes you might need to generate multiple keys. In this situation, you can create a new instance of a class that implements a symmetric algorithm and then create a new key and IV by calling the GenerateKey and GenerateIV methods. The following code example illustrates how to create new keys and IVs after a new instance of the symmetric cryptographic class has been made.
When the previous code is executed, a key and IV are generated when the new instance of TripleDESCryptoServiceProvider is made. Another key and IV are created when the GenerateKey and GenerateIV methods are called.
Asymmetric Keys
The .NET Framework provides the RSACryptoServiceProvider and DSACryptoServiceProvider classes for asymmetric encryption. These classes create a public/private key pair when you use the parameterless constructor to create a new instance. Asymmetric keys can be either stored for use in multiple sessions or generated for one session only. While the public key can be made generally available, the private key should be closely guarded.
A public/private key pair is generated whenever a new instance of an asymmetric algorithm class is created. After a new instance of the class is created, the key information can be extracted using one of two methods:
- The ToXmlString method, which returns an XML representation of the key information.
- The ExportParameters method, which returns an RSAParameters structure that holds the key information.
Both methods accept a Boolean value that indicates whether to return only the public key information or to return both the public-key and the private-key information. An RSACryptoServiceProvider class can be initialized to the value of an RSAParameters structure by using the ImportParameters method.
Asymmetric private keys should never be stored verbatim or in plain text on the local computer. If you need to store a private key, you should use a key container. For more on how to store a private key in a key container, see How to: Store Asymmetric Keys in a Key Container.
The following code example creates a new instance of the RSACryptoServiceProvider class, creating a public/private key pair, and saves the public key information to an RSAParameters structure.
See also
-->This article helps you create an ExpressRoute circuit using the Azure portal and the Azure Resource Manager deployment model. You can also check the status, update, delete, or deprovision a circuit.
Before you begin
- Review the prerequisites and workflows before you begin configuration.
- Ensure that you have access to the Azure portal.
- Ensure that you have permissions to create new networking resources. Contact your account administrator if you do not have the right permissions.
- You can view a video before beginning in order to better understand the steps.
Create and provision an ExpressRoute circuit
1. Sign in to the Azure portal
From a browser, navigate to the Azure portal and sign in with your Azure account.
2. Create a new ExpressRoute circuit
Important
Your ExpressRoute circuit is billed from the moment a service key is issued. Ensure that you perform this operation when the connectivity provider is ready to provision the circuit.
You can create an ExpressRoute circuit by selecting the option to create a new resource.
- On the Azure portal menu or from the Home page, select Create a resource. Select Networking > ExpressRoute, as shown in the following image:
- After you click ExpressRoute, you'll see the Create ExpressRoute circuit page. When you're filling in the values on this page, make sure that you specify the correct SKU tier (Standard, or Premium) and data metering billing model (Unlimited or Metered).
- Tier determines whether an ExpressRoute standard or an ExpressRoute premium add-on is enabled. You can specify Standard to get the standard SKU or Premium for the premium add-on.
- Data metering Wondershare dr fone toolkit torrent. determines the billing type. You can specify Metered for a metered data plan and Unlimited for an unlimited data plan. Note that you can change the billing type from Metered to Unlimited.ImportantNuance dragon professional individual v14.00.000.180 key generator reviews. You can't change the type from Unlimited to Metered.
- Peering Location is the physical location where you are peering with Microsoft.ImportantThe Peering Location indicates the physical location where you are peering with Microsoft. This is not linked to 'Location' property, which refers to the geography where the Azure Network Resource Provider is located. While they are not related, it is a good practice to choose a Network Resource Provider geographically close to the Peering Location of the circuit.
3. View the circuits and properties
View all the circuits
You can view all the circuits that you created by selecting All resources on the left-side menu.
View the properties
You can view the properties of the circuit by selecting it. On the Overview page for your circuit, the service key appears in the service key field. You must copy the service key for your circuit and pass it down to the service provider to complete the provisioning process. The circuit service key is specific to your circuit.
4. Send the service key to your connectivity provider for provisioning
On this page, Provider status provides information on the current state of provisioning on the service-provider side. Circuit status provides the state on the Microsoft side. For more information about circuit provisioning states, see the Workflows article.
When you create a new ExpressRoute circuit, the circuit is in the following state:
Provider status: Not provisioned
Circuit status: Enabled
Circuit status: Enabled
The circuit changes to the following state when the connectivity provider is in the process of enabling it for you:
Provider status: Provisioning
Circuit status: Enabled
Circuit status: Enabled
For you to be able to use an ExpressRoute circuit, it must be in the following state:
Provider status: Provisioned
Circuit status: Enabled
Circuit status: Enabled
5. Periodically check the status and the state of the circuit key
You can view the properties of the circuit that you're interested in by selecting it. Check the Provider status and ensure that it has moved to Provisioned before you continue.
6. Create your routing configuration
For step-by-step instructions, refer to the ExpressRoute circuit routing configuration article to create and modify circuit peerings.
Important
These instructions only apply to circuits that are created with service providers that offer layer 2 connectivity services. If you're using a service provider that offers managed layer 3 services (typically an IP VPN, like MPLS), your connectivity provider configures and manages routing for you.
7. Link a virtual network to an ExpressRoute circuit
Next, link a virtual network to your ExpressRoute circuit. Use the Linking virtual networks to ExpressRoute circuits article when you work with the Resource Manager deployment model.
Getting the status of an ExpressRoute circuit
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You can view the status of a circuit by selecting it and viewing the Overview page.
Modifying an ExpressRoute circuit
You can modify certain properties of an ExpressRoute circuit without impacting connectivity. You can modify the bandwidth, SKU, billing model and allow classic operations on the Configuration page. For information on limits and limitations, see the ExpressRoute FAQ.
You can perform the following tasks with no downtime:
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- Enable or disable an ExpressRoute Premium add-on for your ExpressRoute circuit.
- Increase the bandwidth of your ExpressRoute circuit, provided there is capacity available on the port.ImportantDowngrading the bandwidth of a circuit is not supported.
- Change the metering plan from Metered Data to Unlimited Data.ImportantChanging the metering plan from Unlimited Data to Metered Data is not supported.
- You can enable and disable Allow Classic Operations.ImportantYou may have to recreate the ExpressRoute circuit if there is inadequate capacity on the existing port. You cannot upgrade the circuit if there is no additional capacity available at that location.Although you can seamlessly upgrade the bandwidth, you cannot reduce the bandwidth of an ExpressRoute circuit without disruption. Downgrading bandwidth requires you to deprovision the ExpressRoute circuit and then reprovision a new ExpressRoute circuit.Disabling the Premium add-on operation can fail if you're using resources that are greater than what is permitted for the standard circuit.
To modify an ExpressRoute circuit, click Configuration.
Deprovisioning and deleting an ExpressRoute circuit
You can delete your ExpressRoute circuit by selecting the delete icon. Note the following information: https://greatclever320.weebly.com/key-data-annotation-auto-generated.html.
- You must unlink all virtual networks from the ExpressRoute circuit. If this operation fails, check whether any virtual networks are linked to the circuit.
- If the ExpressRoute circuit service provider provisioning state is Provisioning or Provisioned you must work with your service provider to deprovision the circuit on their side. We continue to reserve resources and bill you until the service provider completes deprovisioning the circuit and notifies us.
- If the service provider has deprovisioned the circuit (the service provider provisioning state is set to Not provisioned), you can delete the circuit. This stops billing for the circuit.
Next steps
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After you create your circuit, continue with the following next steps: