Have to generate a hash function?

If you have to generate a hash function then what characteristics are needed in a secure hash function?

A secure hash function should have the following characteristics:

i. The output generated by a hash function should be of a fixed length.

ii. It should be very easy to find out a hash function for a given message.

iii. If a hash value is given of a message than it is almost impossible to get that message.

iv. The two different messages should not have the same hash value; it is against the hash function property.
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