Many hashing functions are available in the literature. Most of the efficient hash functions are complex.
For instance, MD5 and SHA-1 are complex but very efficient hash functions used for cryptographic ap-
plications. However, for searching records or tokens in files or tables, even simple hash functions give
good results. Some of the common Hashing functions are described below.
1. Midsquare method: The value of the key K is squared and afterwards a suitable number of digits from
the middle of K
2
is chosen to be the address of the record on the disk. Let us assume that 4th and 5th ...
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