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g100num [7]
3 years ago
10

Yo, what's the tinyclick.ml/7hTq link?? I don't trust it, but I'm curious-

Computers and Technology
1 answer:
Rashid [163]3 years ago
5 0
<h2>Answer:</h2>

<u><em>Usually, random people will say that on your questions page to give you a virus but then that link doesn't look like the same link I see every day. I would still not click it just in case.</em></u>

<h2>Explanation:</h2>

<em>Have a good one!</em>

<h2>( ◑‿◑)ɔ┏--┑٩(^◡^ )</h2>
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Write a for loop that computes the following sum: 5+10+15+20+...+485+490+495+500. The sum should be placed in a variable sum tha
Strike441 [17]

Answer:

public class num9 {

   public static void main(String[] args) {

       int sum =0;

       int num =5;

       for(num =5; num<=500; num+=5){

           System.out.println(num);

           sum +=num;

       }

       System.out.println(sum);

   }

}

Explanation:

  • Declare and initialize the variables sum and num
  • Use a for loop with the condition for(num =5; num<=500; num+=5) Since the loop will increment by 5 and run from 5 to 500
  • Within the loop, add num to sum at each iteration
  • Print all elements on seperate lines
  • Outside the loop, print the final value of sum

Create a for loop

6 0
3 years ago
One of the earlier applications of crypto-graphic hash functions was the storage of passwords to authenticate usersin computer s
vagabundo [1.1K]

Answer: provided in the explanation part.

Explanation:

This is actually quite long but nevertheless i will make it as basic as possible.

Question (a)  

Attack A:

One way property of hash means that we can't find the input string if given the hash value. The calculation of hash from input string is possible but it is not possible to calculate the input string when given the hash. If the hash function is properly created to have one-way property then there is no way of finding the exact input string. So this attack won't work as the one-way property of hash function can't be broken if the hash function is properly created.

Attack B:

Suppose h() is the hash function. And h(x) = m where x is the string and m is the hash. Then trying to find another string y such that h(y) = m is called finding out the second pre-image of the hash.

Although we can't know the exact initial string for sure, we can by using brute force method find out a second preimage.

This attack will take a very long time. It has the time complexity of 2n. It requires the attacker to have an idea about the kind of passwords that might be used and then brute force all of them to find the string that has the same hash. Each try will have a chance of 1/2n to succeed.

Rainbow attack using rainbow table is often used for such brute-force attack. This comprises a rainbow table which contains passwords and their pre-hashed values.

Therefore, it is not possible to determine the second preimages of h so easily.

Attack C:

Collisions refer to finding out m and m' without knowing any of them. Finding out collisions is easier than finding preimages. This is because after finding out 2n pairs of input/output. The probability of two of them having the same output or hash becomes very high. The disadvantage is that we can't decide which user's hash to break. However, if I do not care about a particular user but want to get as many passwords as possible, then this method is the most feasible.

It has the time complexity of 2n/2.

Hence, this is the attack which has the most success rate in this scenario.

Question (b)

The brute force way of finding out the password usually involves using a rainbow attack. It comprises a rainbow table with millions of passwords and their hashes already computed. By matching that table against the database, the password can be recovered.

Therefore it is often preferred to salt the password. It means we add some random text to the password before calculating the hash.

The salts are usually long strings. Although users usually do not select long passwords, so a rainbow table with hashes of smaller passwords is feasible. But once salt is used, the rainbow table must accommodate for the salt also. This makes it difficult computationally. Although password might be found in the rainbow table. The salt can be anything and thus, make brute-force a LOT more difficult computationally.

Therefore salt is preferred to be added to passwords before computing their hash value.

Question (c)

A hash output length of 80 means there can be exactly 280 different hash values. This means there is at least one collision if 280+1 random strings are hashed because 280 values are used to accommodate all the possible strings. It is not hard with today's computation power to do match against more than this many strings. And doing so increases the probability of exposing a probable password of a user.

Hence, 80 is not a very secure value for the hash length.

cheers i hope this helps!!!!

6 0
3 years ago
A student is reading a book for language arts. She has to finish three chapters by class tomorrow, because there will be a quiz.
Jobisdone [24]

Answer:

Distracted..?

8 0
2 years ago
Read 2 more answers
Ftp is a _________ that is utilized to copy and manage files over the internet
Marizza181 [45]
<span>Ftp is a network protocol that is utilized to copy and manage files over the internet.  </span>FTP<span> is widely </span>used<span> for transferring </span>files<span> between computers </span>over<span> a TCP/IP-based network, such as the </span>Internet<span>.</span>
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3 years ago
Which code snippet calculates the sum of all the even elements in an array values? Group of answer choices int sum = 0; for (int
olganol [36]

Answer:

The second one:

int sum = 0; for (int i = 0; i < values.length; i++) { if ((values[i] % 2) == 0) { sum += values[i]; } }

5 0
3 years ago
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