Security Policy Exceptions

Not long ago, I was reading a debate on a Linkedin.com forum discussing all kinds of edge cases that some participants were arguing needed to be considered in a security policy regarding some particular aspect of security.  In fact, I forget what the issue was, but it was clear that … Continue reading

Shannon Entropy of Various File Formats

In yesterday’s post, I introduced a tool (graph_file_entropy.py) that I created to visualize the frequency distribution of the bytes in a file.  For today, I will show the results of using this tool for a cursory examination of the Shannon entropy of various, common file formats.  This will illustrate benefits … Continue reading

Calculate File Entropy

Entropy is the measurement of the randomness.  The concept originated in the study of thermodynamics, but Claude E. Shannon in applied the concept to digital communications his 1948 paper, “A Mathematical Theory of Communication.”  Shannon was interested in determining the theoretical maximum amount that a digital file could be compressed. … Continue reading

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