c# wpf qr code generator Key Change Frequency and Re-Authentication Considerations in Visual C#.NET

Printer QR-Code in Visual C#.NET Key Change Frequency and Re-Authentication Considerations

Key Change Frequency and Re-Authentication Considerations
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The considerations in these areas are as follows:
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Both master key and encryption keys can be scheduled to change during data transmissions, and re-authentication can be required. In general, the more frequently the session is authenticated and the more fre quently master and encryption keys are changed, the more secure the data will be. For example, if an attacker were able to deduce one of the encryption keys, he would be able to decrypt only the packets encrypted with this key. If the key is changed frequently, little data will be available. However, each of these options reduces performance and puts additional burdens on the CPU. Choices should be made based on sensitivity of data, and additional performance requirements should be met by additional hardware support. Choices include the following:
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Perfect forward security. The key must be regenerated before each use. Authenticate and generate a new key every so many minutes. On a periodic basis, re-authenticate and generate a new master key. Authenticate and generate a new key every session. Each time a new session is requested, authentication must occur and a new master key is generated. Generate a new key every so many Kbytes. A number of Kbytes is entered, and then each time this number of Kbytes has been transmitted, a new encryption key will be generated. Generate a new key every so many seconds. A number of seconds is indi cated, and at the end of this period a new encryption key will be generated.
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How IPSec Negotiation Policies Work
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If you understand how the negotiation process works, you will be able to design policies that work and take advantage of the negotiation process in your design. Processing can be divided into two phases: Phase I, known as IKE Negotiation Mode or IKE Main Mode (and sometimes just Main Mode), and Phase II, known as Quick Mode. The computer names One and Two are used for expediency.
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Lesson 3
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Designing Security for Internal Data Transmissions
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The Steps in Phase I 1. Computer One sends a packet to computer Two.
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2. The IPSec driver on computer One checks its outbound IP filter lists, detects that the packets match a filter, and determines the filter action is negotiate. 3. The IPSec driver notifies IKE to begin negotiations. 4. Computer One checks its policy for IKE Main Mode settings (authentication, Diffie-Hellman group, encryption, and integrity) to create a proposed nego tiation specification to send to computer Two. 5. Computer One sends the IKE message to computer Two using UDP source port 500 and destination port 500. 6. Computer Two receives the IKE Main Mode message requesting secure negotiation. It uses the source IP address and the destination address of the packet to look up its own Policy IKE settings. It can accept the settings com puter One sent only if they match its active policy settings. 7. If the security settings are compatible, negotiation of the IKE security associ ation begins. A security association (SA) is a secured communication path between two computers. 8. Both computers participate in the negotiation, exchange identities, and authen ticate to each other. A master key is generated, and the IKE SA is established.
The Steps in Phase II 1. Computer One does an IKE Negotiation Mode policy lookup to obtain full policy information. (IKE negotiation does not concern itself with which ports or other Quick Mode settings there are.)
2. Computer One proposes its options, including encryption and integrity algo rithms (if used) and filter to computer Two. 3. Computer Two does its own IKE Negotiation Mode policy lookup. If it finds a match with the options proposed by computer One, it completes the Quick Mode negotiation to create a pair of IPSec SAs. There is one inbound SA and one outbound SA for each port required. Each SA is identified by a unique number, known as a Security Parameters Index (SPI). 4. Computer One s IPSec driver uses the outbound SA, signs, and if specified, encrypts the packets. 5. The IPSec driver passes the packets to the network adapter driver. 6. The network adapter driver puts the packets on the network 7. The network adapter on computer Two receives the packets from the network.
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