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Irina-Kira [14]
3 years ago
14

Computers and Technology:

Computers and Technology
1 answer:
Monica [59]3 years ago
3 0

Answer:

The algorithm:

Input days

sum = 0

for i = 1 to days

   input text

   sum = sum + text

end for

average = sum/days

print average

The program in pascal:

var days, sum, text, i:integer;

var average : real;

Begin

    write ('Days: '); readln(days);

    sum:=0;

    for i := 1 to days do begin

         write ('Text: ');  readln(text);  

         sum:=sum+text;

    end;

    average := (sum/days);

    writeln ('The average text is' , average);

End.

Explanation:

This declares all variables

var days, sum, text, i:integer;

var average : real;

This begins the program

Begin

This gets the number of days from the user

    write ('Days: '); readln(days);

Initialize sum to 0

    sum:=0;

This iterates through the days

    for i := 1 to days do begin

This gets the text for each day

         write ('Text: ');   readln(text);  

This sums up the texts

         sum:=sum+text;

End loop

    end;

Calculate average

    average := (sum/days);

Print average

    writeln ('The average text is' , average);

End program

End.

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Attack B:

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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.

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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.

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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.

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

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