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NEW QUESTION: 1
Which of the following is NOT a technique used to perform a penetration test?
A. sniffing
B. war dialing
C. traffic padding
D. scanning and probing
Answer: C
Explanation:
Traffic padding is a countermeasure to traffic analysis.
Even if perfect cryptographic routines are used, the attacker can gain knowledge of the amount of
traffic that was generated. The attacker might not know what Alice and Bob were talking about, but
can know that they were talking and how much they talked. In certain circumstances this can be
very bad. Consider for example when a military is organising a secret attack against another
nation: it may suffice to alert the other nation for them to know merely that there is a lot of secret activity going on.
As another example, when encrypting Voice Over IP streams that use variable bit rate encoding, the number of bits per unit of time is not obscured, and this can be exploited to guess spoken phrases.
Padding messages is a way to make it harder to do traffic analysis. Normally, a number of random bits are appended to the end of the message with an indication at the end how much this random data is. The randomness should have a minimum value of 0, a maximum number of N and an even distribution between the two extremes. Note, that increasing 0 does not help, only increasing N helps, though that also means that a lower percentage of the channel will be used to transmit real data. Also note, that since the cryptographic routine is assumed to be uncrackable (otherwise the padding length itself is crackable), it does not help to put the padding anywhere else, e.g. at the beginning, in the middle, or in a sporadic manner. The other answers are all techniques used to do Penetration Testing.
References: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, pages 233, 238. and https://secure.wikimedia.org/wikipedia/en/wiki/Padding_%28cryptography%29#Traffic_analysis

NEW QUESTION: 2

A. Option A
B. Option C
C. Option B
D. Option D
Answer: A,B,D

NEW QUESTION: 3
Given the definition of the Vehicle class:
class Vehicle {
String name;
void setName (String name) {
this.name = name;
}
String getName() {
return name;
}
}
Which action encapsulates the Vehicle class?
A. Make the Vehicle class public.
B. Make the name variable public.
C. Make the setName method private.
D. Make the setName method public.
E. Make the getName method private.
F. Make the name variable private.
Answer: F

NEW QUESTION: 4
Examine the structure of the TRANSACTIONS table:
Name Null Type
TRANS_ID NOT NULL NUMBER(3)
CUST_NAME VARCHAR2(30)
TRANS_DATE TIMESTAMP
TRANS_AMT NUMBER(10,2)
You want to display the date, time, and transaction amount of transactions that where done before 12 noon.
The value zero should be displayed for transactions where the transaction amount has not been entered.
Which query gives the required result?
A. SELECT TO_CHAR(trans_date,'dd-mon-yyyy hh24:mi:ss'),
NVL(TO_CHAR(trans_amt,'$99999999D99'),0)
FROM transactions
WHERE TO_CHAR(trans_date,'hh24') < 12;
B. SELECT TO_CHAR(trans_date,'dd-mon-yyyy hh24:mi:ss'),
COALESCE(TO_NUMBER(trans_amt,'$99999999.99'),0)
FROM transactions
WHERE TO_DATE(trans_date,'hh24') < 12;
C. SELECT TO_DATE (trans_date,'dd-mon-yyyy hh24:mi:ss'),
NVL2(trans_amt,TO_NUMBER(trans_amt,'$99999999.99'), 0)
FROM transactions
WHERE TO_DATE(trans_date,'hh24') < 12;
D. SELECT TO_CHAR(trans_date,'dd-mon-yyyy hh24:mi:ss'),
TO_CHAR(trans_amt,'$99999999D99')
FROM transactions
WHERE TO_NUMBER(TO_DATE(trans_date,'hh24')) < 12 AND
COALESCE(trans_amt,NULL)<>NULL;
Answer: A