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KengaRu [80]
3 years ago
13

A downloaded executable file may contain harmful software known as

Computers and Technology
2 answers:
mylen [45]3 years ago
8 0

Answer:

A downloaded executable file may contain harmful software know as malware.

Further details:

Malwares:

Malware (a portmanteau for pernicious programming) is any product purposefully intended to make harm a PC, server, customer, or PC network. Malware does the harm after it is embedded or brought somehow or another into an objective's PC and can appear as legitimately executable code, contents, supposed "dynamic substance" (Microsoft Windows), and different types of data. Some sorts of malware are to a great extent alluded to in the media as PC infections, worms, Trojan steeds, ransomware, spyware, adware, and scareware, among different terms. Malware has a malignant expectation, acting against the enthusiasm of the PC client—thus does exclude programming that causes accidental damage because of some lack, which is regularly portrayed as a product bug.

Uses:

Malware is once in a while utilized comprehensively against government or corporate sites to assemble monitored information, or to upset their activity as a rule. However, malware can be utilized against people to pick up data, for example, individual recognizable proof numbers or subtleties, bank or charge card numbers, and passwords.

Answer details:

Subject: Computer and technology

Level: College

Keywords:

• Harmful software

• Malware

• Malware software

• Uses of malware

• Purpose of malware

Learn more to evaluate:

brainly.com/question/4997492

brainly.com/question/4010464

brainly.com/question/1754173

djyliett [7]3 years ago
3 0

A downloaded executable file may contain harmful software known as malware.

Further Explanation:

Malware: Malware is a file or program that is harmful for the computer system. Malware has various types which include viruses, Trojan horses, worms and spyware. These are mostly downloads over the internet either by click on the malicious link or through email. The purpose of these programs are deleting or stealing sensitive data, hijacking the computer programs or monitoring the computer users without their permission.  

Phishing attack is one of the malware activities where attackers send malicious link or attachment through attachment to hijack the computer’s core functionality. In this case, computer user thinks that it is legitimate message but actually it is malicious. Other malware attack done over the internet is drive by download where malicious program automatically download to the system without taking permission from the user.

The main types of malware are listed below:

  • Virus
  • Worm
  • Trojan horse
  • Spyware
  • Ransomware
  • Rootkit
  • Adware
  • Keyloggers

Learn more:

1. A company that allows you to license software monthly to use online is an example of ? brainly.com/question/10410011  

2. Prediction accuracy of a neural network depends on _______________ and ______________. brainly.com/question/10599832  

3. The shape of our galaxy was determined ‘on the inside looking out' by surveying the milky way using ____________ telescopes. brainly.com/question/7866623  

4. List 3 characteristics of the ideal encryption scheme. brainly.com/question/3000161

Answer details:

  • Grade: Computer Engineering
  • Subject: Information Security
  • Chapter: Malware

Keyword:

Malware, virus, worm, Trojan horse, spyware, downloaded, executable, file, harmful, software, key loggers, adware, ransomware,phishing attack, drive by download

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What are the main features cyber law of Nepal​
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Answer:

What are the provisions of cyber law in Nepal?

Provision of cyber law of NEPAL

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Hope this helps Have a good day

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
4 years ago
A DFA is equivalent in power to an NFA. True False
sattari [20]

Answer: True

Explanation:

  Yes, the given statement is true that a DFA is equivalent to NFA in terms of power. For any type of NFA we can easily build an equal DFA so, the NFA are not much powerful as compared to DFA. Both NFA and DFA are characterized by a similar type of class.

DFA is a special case of NFA and They both defined in the same class of language. Each condition in the DFA get summarized by all the condition that the NFA has itself.

4 0
3 years ago
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