GATE | GATE IT 2006 | Question 20

Which of the following statement(s) is TRUE?

  1. A hash function takes a message of arbitrary length and generates a fixed length code.
  2. A hash function takes a message of fixed length and generates a code of variable length.
  3. A hash function may give the same hash value for distinct messages.

(A) I only
(B) II and III only
(C) I and III only
(D) II only

Answer: (C)


Hash function is defined as any function that can be used to map data of arbitrary size of data to a fixed size data.. The values returned by a hash function are called hash values, hash codes, digests, or simply hashes  :  Statement 1 is correct
Yes, it is possible that a Hash Function maps a value to a same location in the memmory that’s why collision occurs and we have different technique to handle  this problem : Statement 3 is coorect.
eg : we have hash function, h(x) = x mod 3

Acc to Statement 1, no matter what the value of ‘x’ is h(x) results in a fixed mapping location.
Acc. to Statement 3, h(x) can result in same mapping mapping location for different value of ‘x’ e.g. if x = 4 or x = 7 , h(x) = 1 in both the cases, although collision occurs.


This solution is contributed by Mohit Gupta.

Quiz of this Question

My Personal Notes arrow_drop_up

Recommended Posts:

0 Average Difficulty : 0/5.0
No votes yet.

User Actions