Hardening Perl’s Hash Function
In 2003 the Perl development community was made aware of an algorithmic complexity attack on the Perl’s hash table implementation[1]. This attack was similar to reports over the last few years of attacks on other languages and packages, such as the Java, Ruby and Python hash implementations. Written by Yves Orton The basic idea of this attack is to precompute a set of keys which would hash to the
PNP 12 PT | PDF | Computational Complexity Theory | Theoretical Computer Science
This document presents a proof that P ≠ NP, the complexity classes of problems that can be solved in polynomial time by a deterministic Turing machine and non-deterministic polynomial time, respectively, are separate. It does this by showing that polynomial time algorithms, which can be described by fixed point logic, cannot solve NP-complete problems like k-SAT in their computationally hard phase
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