2. Hash Function
Can be applied to a block of data of any size
●produce a fixed-length output
●relatively easy to compute of any given value,
making both hardware and software
implementations practical
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3. Hash Function
For any given hash code h, it is computationally
infeasible to find x such that H(x) = h. We called it
one-way property
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4. Hash Function
For any given block x, it is computationally
infeasible to find y <> x with H(y) = H(x). This is
referred to as weak collision resistance.
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5. Hash Function
It is computationally infeasible to find any pair (x,
y) such that H(x) = H(y). It is referred to as string
collision resistance.
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8. Solution
publish the method and open the source for all
people to review.
●increase the length of the hash code.
●add salt
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9. Possible Cracking of
HKID Hash Code
Server had been cracked
●Dictionary Attack
●man in middle (Depends on the Design)
●Virus
●Key Logger
●Binary or source code disclose
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