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NEW QUESTION: 1
この攻撃では、攻撃者は被害者をだまして、すでに使用されているキーを再インストールさせます。これは、暗号化ハンドシェイクメッセージを操作および再生することによって実現されます。被害者がキーを再インストールすると、増分送信パケット番号や受信パケット番号などの関連パラメータが初期値にリセットされます。この攻撃は何と呼ばれていますか？
A. 邪悪な双子
B. KRACK
C. ウォードライビング
D. チョップチョップアタック
Answer: B
Explanation:
Explanation
In this attack KRACK is an acronym for Key Reinstallation Attack. KRACK may be a severe replay attack on Wi-Fi Protected Access protocol (WPA2), which secures your Wi-Fi connection. Hackers use KRACK to take advantage of a vulnerability in WPA2. When in close range of a possible victim, attackers can access and skim encrypted data using KRACK.
How KRACK WorksYour Wi-Fi client uses a four-way handshake when attempting to attach to a protected network. The handshake confirms that both the client - your smartphone, laptop, et cetera - and therefore the access point share the right credentials, usually a password for the network. This establishes the Pairwise passkey (PMK), which allows for encoding .Overall, this handshake procedure allows for quick logins and connections and sets up a replacement encryption key with each connection. this is often what keeps data secure on Wi-Fi connections, and every one protected Wi-Fi connections use the four-way handshake for security. This protocol is that the reason users are encouraged to use private or credential-protected Wi-Fi instead of public connections.KRACK affects the third step of the handshake, allowing the attacker to control and replay the WPA2 encryption key to trick it into installing a key already in use. When the key's reinstalled, other parameters related to it - the incremental transmit packet number called the nonce and therefore the replay counter - are set to their original values.Rather than move to the fourth step within the four-way handshake, nonce resets still replay transmissions of the third step. This sets up the encryption protocol for attack, and counting on how the attackers replay the third-step transmissions, they will take down Wi-Fi security.
Why KRACK may be a ThreatThink of all the devices you employ that believe Wi-Fi. it isn't almost laptops and smartphones; numerous smart devices now structure the web of Things (IoT). due to the vulnerability in WPA2, everything connected to Wi-Fi is in danger of being hacked or hijacked.Attackers using KRACK can gain access to usernames and passwords also as data stored on devices. Hackers can read emails and consider photos of transmitted data then use that information to blackmail users or sell it on the Dark Web.Theft of stored data requires more steps, like an HTTP content injection to load malware into the system. Hackers could conceivably take hold of any device used thereon Wi-Fi connection. Because the attacks require hackers to be on the brink of the target, these internet security threats could also cause physical security threats.On the opposite hand, the necessity to be in close proximity is that the only excellent news associated with KRACK, as meaning a widespread attack would be extremely difficult.Victims are specifically targeted. However, there are concerns that a experienced attacker could develop the talents to use HTTP content injection to load malware onto websites to make a more widespread affect.
Everyone is in danger from KRACK vulnerability. Patches are available for Windows and iOS devices, but a released patch for Android devices is currently in question (November 2017). There are issues with the discharge , and lots of question if all versions and devices are covered.The real problem is with routers and IoT devices. These devices aren't updated as regularly as computer operating systems, and for several devices, security flaws got to be addressed on the manufacturing side. New devices should address KRACK, but the devices you have already got in your home probably aren't protected.
The best protection against KRACK is to make sure any device connected to Wi-Fi is patched and updated with the newest firmware. that has checking together with your router's manufacturer periodically to ascertain if patches are available.
The safest connection option may be a private VPN, especially when publicly spaces. If you would like a VPN for private use, avoid free options, as they need their own security problems and there'll even be issues with HTTPs. Use a paid service offered by a trusted vendor like Kaspersky. Also, more modern networks use WPA3 for better security.Avoid using public Wi-Fi, albeit it's password protection. That password is out there to almost anyone, which reduces the safety level considerably.All the widespread implications of KRACK and therefore the WPA2 vulnerability aren't yet clear. what's certain is that everybody who uses Wi-Fi is in danger and wishes to require precautions to guard their data and devices.
NEW QUESTION: 2
質問をドラッグアンドドロップ
脅威軽減技術を左側からドラッグして、右側の脅威または攻撃の種類にドロップします。
Answer:
Explanation:
Explanation:
Double-Tagging attack:
In this attack, the attacking computer generates frames with two 802.1Q tags. The first tag matches the native VLAN of the trunk port (VLAN 10 in this case), and the second matches the VLAN of a host it wants to attack (VLAN 20).
When the packet from the attacker reaches Switch A, Switch A only sees the first VLAN 10 and it matches with its native VLAN 10 so this VLAN tag is removed. Switch A forwards the frame out all links with the same native VLAN 10. Switch B receives the frame with an tag of VLAN 20 so it removes this tag and forwards out to the Victim computer.
Note: This attack only works if the trunk (between two switches) has the same native VLAN as the attacker.
To mitigate this type of attack, you can use VLAN access control lists (VACLs, which applies to all traffic within a VLAN. We can use VACL to drop attacker traffic to specific victims/servers) or implement Private VLANs.
ARP attack (like ARP poisoning/spoofing) is a type of attack in which a malicious actor sends falsified ARP messages over a local area network as ARP allows a gratuitous reply from a host even if an ARP request was not received. This results in the linking of an attacker's MAC address with the IP address of a legitimate computer or server on the network. This is an attack based on ARP which is at Layer 2. Dynamic ARP inspection (DAI) is a security feature that validates ARP packets in a network which can be used to mitigate this type of attack.
NEW QUESTION: 3
Sara Robinson and Marvin Gardner are considering an opportunity to start their own money management firm. Their conversation leads them to a discussion on establishing a portfolio management process and investment policy statements. Robinson makes the following statements:
Statement 1;
Our only real objective as portfolio managers is to maximize the returns to our clients.
Statement 2:
If we are managing only a fraction of a client's total wealth, it is the client's responsibility, not ours, to determine how their investments are allocated among asset classes.
Statement 3: When developing a client's strategic asset allocation, portfolio managers have to consider capital market expectations. In response, Gardner makes the following statements:
Statement 4: While return maximization is important for a given level of risk, we also need to consider the client's tolerance for risk.
Statement 5: We'll let our clients worry about the tax implications of their investments; our time is better spent on finding undervalued assets.
Statement 6: Since we expect our investor's objectives to be constantly changing, we will need to evaluate their investment policy statements on an annual basis at a minimum.
Robinson wants to focus on younger clientele with the expectation that the new firm will be able to retain the clients for a long time and create long-term profitable relationships. While Gardner felt it was important to develop long-term relationships, he wants to go after older, high-net-worth clients.
Which one of the following factors is the least likely to affect the individual investor's ability to accept risk?
A. Behavioral factors.
B. Financial strength.
C. Required spending needs.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
Specific factors that determine an investor's ability to accept risk include required spending needs, financial strength, and long-term wealth targets. Behavioral factors affect an individual investor's willingness to accept risk. (Study Session 18, LOS 68.c)