Which of the following statement(s) is TRUE?
- A hash function takes a message of arbitrary length and generates a fixed length code.
- A hash function takes a message of fixed length and generates a code of variable length.
- 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)
Explanation:
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 memory that\’s why collision occurs and we have different technique to handle this problem : Statement 3 is correct. 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.
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