Determine the process using which a pseudorandom function family can be constructed .

I would be grateful if someone could provide the construction method of a pseudorandom function family.

pumpedup

over 13 years ago

Network security

5 replies

rogerpapa

over 13 years ago

"A pseudorandom function family can be constructed from any pseudorandom generator, using, for example, the construction given by Goldreich, Goldwasser, and Micali. Source: http://in.docsity.com/en-docs/Network_Security_and_Cryptology__lecture_notes__Biyani_Girls_College"

sachinii

over 13 years ago

"A pseudorandom function family, abbreviated PRF, is often a collection of successfully-estimable operates that imitate a haphazard oracle from the next method: no more effective protocol tin secern (along with significant advantages) from a operate picked arbitrarily through the PRF household plus a random oracle (A function whose results usually are preset wholly indiscriminately). "

to see other 3 answers

Kindly determine a method using which we pass less values than number of arguments of a function.

Hi! Please help me I am stuck with this.

markzck

over 13 years ago

Sociology

Determine the coming out process of Establishing a Gay or Lesbian Identity.

Can some one out in the Docsity world provide the details of the method using which a person can make his gay or lesbian Identity.

herbert-bryant

almost 5 years ago

Financial Market

The ABC bank has a deposit base on which it holds excess reserves of $42 Million at a reserve rate which relates to a money multiplier (MM) of 5. On January 2, 2010 Mwen-Mwen, a customer of ABC bank issued a $20 Million check drawn on its account,

(a) The reserve ratio (b) the initial deposit base prior to the $20 Million transaction. (c) Using the money supply expansion process, determine (i) the maximum amount of creation permissible by the marginal deposit and (ii) the reduction in ABC bank’s lending capacity as a result of its total deposits after the $20 Million transaction. (d) The reserve requirement that ABC Bank must take to the Central Bank of Liberia as a result of the $20 Million drawn by its customer, Mwen-Mwen company. (e) Determine the amount deposit (if any) lost by each of the two banks, and the net loss to the global banking system. Explain the rationale for your answer.

Greatfortune

about 5 years ago

Programming Languages

Write a function called has_duplicates that takes a strings parameter and returns True

Start with the following Python code. alphabet = "abcdefghijklmnopqrstuvwxyz" test_dups = ["zzz","dog","bookkeeper","subdermatoglyphic","subdermatoglyphics"] test_miss = ["zzz","subdermatoglyphic","the quick brown fox jumps over the lazy dog"] From Section 11.2 of: Downey, A. (2015). Think Python: How to think like a computer scientist. Needham, Massachusetts: Green Tree Press. def histogram(s): d = dict() for c in s: if c not in d: d[c] = 1 else: d[c] += 1 return d Copy the code above into your program but write all the other code for this assignment yourself. **Do not copy any code from another source. ** **Part 1 ** Write a function called has_duplicates that takes a string parameter and returns True if the string has any repeated characters. Otherwise, it should return False. Implement has_duplicates by creating a histogram using the histogram function above. Do not use any of the implementations of has_duplicates that are given in your textbook. Instead, your implementation should use the counts in the histogram to decide if there are any duplicates. Write a loop over the strings in the provided test_dups list. Print each string in the list and whether or not it has any duplicates based on the return value of has_duplicates for that string. For example, the output for "aaa" and "abc" would be the following. aaa has duplicatesabc has no duplicates Print a line like one of the above for each of the strings in test_dups. **Part 2 ** Write a function called missing_letters that takes a string parameter and returns a new string with all the letters of the alphabet that are not in the argument string. The letters in the returned string should be in alphabetical order. Your implementation should use a histogram from the histogram function. It should also use the global variable alphabet. It should use this global variable directly, not through an argument or a local copy. It should loop over the letters in alphabet to determine which are missing from the input parameter. The function missing_letters should combine the list of missing letters into a string and return that string. Write a loop over the strings in list test_miss and call missing_letters with each string. Print a line for each string listing the missing letters. For example, for the string "aaa", the output should be the following. aaa is missing letters bcdefghijklmnopqrstuvwxyz If the string has all the letters in alphabet, the output should say it uses all the letters. For example, the output for the string alphabet itself would be the following. abcdefghijklmnopqrstuvwxyz uses all the letters Print a line like one of the above for each of the strings in test_miss. Submit your Python program. It should include the following.

The provided code for alphabet, test_dups, test_miss, and histogram.
Your implementation of the has_duplicates function.
A loop that outputs duplicate information for each string in test_dups.
Your implementation of the missing_letters function.
A loop that outputs missing letters for each string in test_miss.

Also submit the output from running your program. Your submission will be assessed using the following Aspects.

Does the program include a function called has_duplicates that takes a string parameter and returns a boolean?
Does the has_duplicates function call the histogram function?
Does the program include a loop over the strings in test_dups that calls has_duplicate on each string?
Does the program correctly identify whether each string in test_dups has duplicates?
Does the program include a function called missing_letters that takes a string parameter and returns a string?
Does the missing_letters function call the histogram function?
Does the missing_letters function use the alphabet global variable directly?
Does the program include a loop over the strings in test_miss that calls missing_letters on each string?
Does the program correctly identify the missing letters for each string in test_miss, including each string that "uses all the letters"?

mooosa2020

over 7 years ago

Mathematical Statistics

Life Contingencies problem

Exercise 2.12 (a) Construct a table of px for Makeham’s law with parameters A = 0.0001, B = 0.00035 and c = 1.075, for integer x from age 0 to age 130, using Excel or other appropriate computer software. You should set the parameters so that they can be easily changed, and you should keep the table, as many exercises and examples in future chapters will use it. (b) Use the table to determine the age last birthday at which a life currently aged 70 is most likely to die. (c) Use the table to calculate e70. (d) Using a numerical approach, calculate ◦e

#consider that: A=0.0001, B=0.00035, C=1.075 ##a A <- 0.0001 B <- 0.00035 C <- 1.075 #the equation of px for Makeham's law can be written as px <- function (x) { exp(-(A +(B/log(C))*C^x*(C-1))) } x <- 0:130 p <- px(x) output <- cbind(x, round(p, 5)) colnames(output) <- c("x", "px") print(output) ##b #we generate various probabilities for different t. tp70 <- function(t) { exp(-(A*t +(B/log(C))*C^70*(C^t-1)))} tbarq70 <- function(t) {tp70(t)-tp70(t+1)} tp70(t) y <- 70:130 t <- rev(130-y) q <- tbarq70(t) outputb <- cbind(y, t, round(q, 5)) colnames(outputb) <- c("y", "t", "t|q70") print(outputb) ##c #now we get the table of k_p_70 for k = 1 to 70 tp70 <- function(t) {exp(-(A*t +(B/log(C))*C^70*(C^t-1)))} y <- 70:130 t <- rev(130-y) p70 <- tp70(t)[-1] e70 <- sum(p70) e70 ##d #now we calculate e^0_70 by using numerical approach exc <- function(to1) { a=0 h=0.25 k=0 v1 = (h/3)*(tp70(a)+4*tp70(a+h)+tp70(a+2*h)) v = v1 while (v1 > to1) { k = k+2 lim1 = a+k*h mid = a+(k+1)\*h lim2 = a+(k+2)\*h v2 = (h/3)*(tp70(lim1)+4*tp70(mid)+tp70(lim2)) z = v +v2 }

to1 <- 10^(-50) ec70 <- exc(to1) ec70 I'm trying to calculate e^0_70 using numerical approach with R, but somehow my code for part d is not working. Can anyone please tell what wrong with my code? the answer should be 9.8341

Search questions by subject