Pass4sure Microsoft 70-630 practice testing
WEP 70-640 70-297 70-630
WEP is a wireless security protocol that helps protect your information by using a security setting, called a shared secret or a shared key, to encrypt network traffic before transmitting it over the airwaves. This helps prevent unauthorized users from accessing the data as it is being transmitted.
Unfortunately, some smart cryptographers found several theoretical ways to discover WEP’s shared secret by analyzing captured traffic. These theoretical weaknesses were quickly implemented in freely available software. The combination of free tools for cracking WEP encryption, the ease of capturing wireless traffic, and the dense proliferation of wireless networks have led WEP to become the most frequently cracked network encryption protocol today.
Security Alert You won’t need to understand the details of the WEP standard for the exam, but it is an interesting study on how not to make an encryption protocol. The most easily exploited weakness of WEP is that many of WEP’s possible initialization vectors (IVs) are cryptographically weak and can expose individual bytes of the WEP key. WEP changes these IVs over time, and an attacker who captures millions of packets will eventually gather enough packets with weak IVs to crack the entire WEP key. Some wireless network adapters intentionally avoid using weak IVs, which makes it much more time-consuming to expose the WEP key. Ask your network adapter vendor what they’ve done to make WEP communications more secure. For more detailed information on WEP’s weaknesses, search for the paper titled “Weaknesses in the Key Scheduling Algorithm of RC4” on the Internet. MB2-631 70-294 70-647
Besides weak cryptography, another factor contributing to WEP’s vulnerability is that WEP is difficult to manage because it doesn’t provide any mechanism for changing the shared secret. On wireless networks with hundreds of hosts configured to use a WAP, it is practically impossible to regularly change the shared secret on all hosts. As a result, the WEP shared secret tends to stay the same indefinitely. This gives attackers sufficient opportunity to crack the shared secret and all the time they need to abuse their ill-gotten network access.
WEP
WEP is a wireless security protocol that helps protect your information by using a security setting, called a shared secret or a shared key, to encrypt network traffic before transmitting it over the airwaves. This helps prevent unauthorized users from accessing the data as it is being transmitted.
Unfortunately, some smart cryptographers found several theoretical ways to discover WEP’s shared secret by analyzing captured traffic. These theoretical weaknesses were quickly implemented in freely available software. The combination of free tools for cracking WEP encryption, the ease of capturing wireless traffic, and the dense proliferation of wireless networks have led WEP to become the most frequently cracked network encryption protocol today.
Security Alert You won’t need to understand the details of the WEP standard for the exam, but it is an interesting study on how not to make an encryption protocol. The most easily exploited weakness of WEP is that many of WEP’s possible initialization vectors (IVs) are cryptographically weak and can expose individual bytes of the WEP key. WEP changes these IVs over time, and an attacker who captures millions of packets will eventually gather enough packets with weak IVs to crack the entire WEP key. Some wireless network adapters intentionally avoid using weak IVs, which makes it much more time-consuming to expose the WEP key. Ask your network adapter vendor what they’ve done to make WEP communications more secure. For more detailed information on WEP’s weaknesses, search for the paper titled “Weaknesses in the Key Scheduling Algorithm of RC4” on the Internet.
Besides weak cryptography, another factor contributing to WEP’s vulnerability is that WEP is difficult to manage because it doesn’t provide any mechanism for changing the shared secret. On wireless networks with hundreds of hosts configured to use a WAP, it is practically impossible to regularly change the shared secret on all hosts. As a result, the WEP shared secret tends to stay the same indefinitely. This gives attackers sufficient opportunity to crack the shared secret and all the time they need to abuse their ill-gotten network access. 70-270 SY0-101 70-291