Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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write a simple hashing function that uses addition and multiplication and then find a pair of strings that will return the same hash value for different strings (i.e you will cause a Hash Collision).  The algorithm uses multiplication based on the position of a letter in the hash to avoid a hash collision when two letters are transposed like in 'ABCDE' and 'ABDCE'. Your strings need to be at least three characters long and no more than 10 characters long.

 

Here is the code that computes your hash:

while True:

txt = input("Enter a string: ")

if len(txt) < 1 : break

hv = 0

pos = 0

for let in txt:

pos = ( pos % 2 ) + 1

hv = (hv + (pos * ord(let))) % 1000000

print(let, pos, ord(let), hv)

print(hv, txt)

For simplicity we will only use upper and lower case ASCII letters in our text strings.

Enter a string: ABCDE

A 1 65 65

B 2 66 197

C 1 67 264

D 2 68 400

E 1 69 469

469 ABCDE

Enter a string: BACDE

B 1 66 66

A 2 65 196

C 1 67 263

D 2 68 399

E 1 69 468

468 BACDE

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