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NEW QUESTION 47
How can rainbow tables be defeated?
- A. Password salting
- B. Use of non-dictionary words
- C. Lockout accounts under brute force password cracking attempts
- D. All uppercase character passwords
A salt is random data that is used as an additional input to a one-way function that hashes data, a password, or passphrase. Salts are used to safeguard passwords in storage. Historically a password was stored in plaintext on a system, but over time additional safeguards were developed to protect a user's password against being read from the system. A salt is one of those methods.
A new salt is randomly generated for each password. In a typical setting, the salt and the password (or its version after key stretching) are concatenated and processed with a cryptographic hash function, and the output hash value (but not the original password) is stored with the salt in a database. Hashing allows for later authentication without keeping and therefore risking exposure of the plaintext password in the event that the authentication data store is compromised.
Salts defend against a pre-computed hash attack, e.g. rainbow tables. Since salts do not have to be memorized by humans they can make the size of the hash table required for a successful attack prohibitively large without placing a burden on the users. Since salts are different in each case, they also protect commonly used passwords, or those users who use the same password on several sites, by making all salted hash instances for the same password different from each other.
NEW QUESTION 48
Which of the following is not a Bluetooth attack?
- A. Bluedriving
- B. Bluesnarfing
- C. Bluesmacking
- D. Bluejacking
Bluedriving is a bluetooth wardriving utility. It can capture bluetooth devices, lookup their services, get GPS information and present everything in a nice web page. It can search for and show a lot of information about the device, the GPS address and the historic location of devices on a map. The main motivation of this tool is to research about the targeted surveillance of people by means of its cellular phone or car. With this tool you can capture information about bluetooth devices and show, on a map, the points where you have seen the same device in the past.
NEW QUESTION 49
Which of the following tools can be used for passive OS fingerprinting?
- A. tcpdump
- B. tracert
- C. ping
- D. nmap
NEW QUESTION 50
What is the algorithm used by LM for Windows2000 SAM?
- A. DES
- B. MD4
- C. SHA
- D. SSL
NEW QUESTION 51