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NEW QUESTION 54
Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping the conversation and keeps the password. After the interchange is over, Eve connects to Bob posing as Alice; when asked for a proof of identity, Eve sends Alice’s password read from the last session, which Bob accepts.
Which of the following attacks is being used by Eve?
- A. Cross site scripting
- B. Replay
- C. Fire walking
- D. Session fixation
Eve is using Replay attack. A replay attack is a type of attack in which attackers capture packets containing passwords or digital signatures whenever packets pass between two hosts on a network. In an attempt to obtain an authenticated connection, the attackers then resend the captured packet to the system. In this type of attack, the attacker does not know the actual password, but can simply replay the captured packet. Session tokens can be used to avoid replay attacks. Bob sends a one-time token to Alice, which Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Mallory has captured this value and tries to use it on another session; Bob sends a different session token, and when Mallory replies with the captured value it will be different from Bob’s computation.
Answer option C is incorrect. In the cross site scripting attack, an attacker tricks the user’s computer into running code, which is treated as trustworthy because it appears to belong to the server, allowing the attacker to obtain a copy of the cookie or perform other operations.
Answer option B is incorrect. Firewalking is a technique for gathering information about a remote network protected by a firewall. This technique can be used effectively to perform information gathering attacks. In this technique, an attacker sends a crafted packet with a TTL value that is set to expire one hop past the firewall.
Answer option D is incorrect. In session fixation, an attacker sets a user’s session id to one known to him, for example by sending the user an email with a link that contains a particular session id. The attacker now only has to wait until the user logs in.
NEW QUESTION 55
Which of the following is the best way of protecting important data against virus attack?
- A. Implementing a firewall.
- B. Updating the anti-virus software regularly.
- C. Using strong passwords to log on to the network.
- D. Taking daily backup of data.
Updating the anti-virus software regularly is the best way of protecting important data against virus attack.
NEW QUESTION 56
Which of the following is an IPSec protocol that can be used alone in combination with Authentication Header
- A. PPTP
- B. PPP
- C. L2TP
- D. ESP
NEW QUESTION 57
Adam, a malicious hacker, has just succeeded in stealing a secure cookie via a XSS attack. He is able to
replay the cookie even while the session is valid on the server. Which of the following is the most likely reason
of this cause?
- A. Encryption is performed at the network layer (layer 1 encryption).
- B. Encryption is performed at the application layer (single encryption key).
- C. No encryption is applied.
- D. Two way encryption is applied.
Single key encryption uses a single word or phrase as the key. The same key is used by the sender to encrypt
and the receiver to decrypt. Sender and receiver initially need to have a secure way of passing the key from
one to the other. With TLS or SSL this would not be possible. Symmetric encryption is a type of encryption that
uses a single key to encrypt and decrypt data. Symmetric encryption algorithms are faster than public key
encryption. Therefore, it is commonly used when a message sender needs to encrypt a large amount of data.
Data Encryption Standard (DES) uses the symmetric encryption key algorithm to encrypt data.
NEW QUESTION 58
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