3
$\begingroup$

I was recently reading about hash functions, and I came across fixed points (one or more fixed points, interested in both) and length extensions, but I didn't exactly understand how these work. If someone can explain them or point me to a reference, I would be glad.

$\endgroup$

1 Answer 1

7
$\begingroup$

If $H(x) = x$, $x$ is a fixed point. If for a value the output of the function is the same as the input, it is called a fixed point.

A length extension attack is unrelated to the concept of fixed points. There is a good question about understanding length extension attacks here.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.