#!/bin/bash # entropy.sh – Compute Shannon entropy of a file FILE=$1 if [[ -z "$FILE" ]]; then echo "Usage: $0 <file>"; exit 1; fi ent=$(dd if="$FILE" bs=1M count=10 2>/dev/null | \ tr -cd '\0-\177' | \ awk ' for(i=1;i<=length;i++) freq[substr($0,i,1)]++ END for(c in freq) p=freq[c]/NR; H+=-p*log(p)/log(2) printf "%.4f bits/byte\n", H ') echo "Entropy of $FILE: $ent
#!/usr/bin/env python3 """ reconstruct_rar.py Reconstructs a multi‑part RAR archive from sequential .partNN.rar files. """
out = f"base.reconstructed.rar" concatenate(parts, out) MIFD-481-u.part09.rar
import pathlib import sys import hashlib
print("[*] Whole‑archive SHA‑256:", compute_sha256(out)) then echo "Usage: $0 <
def main(): if len(sys.argv) != 2: print("Usage: reconstruct_rar.py <base_name>") sys.exit(1)
Forensic Reconstruction and Analysis of Multi‑Part RAR Archives: A Case Study of “MIFD‑481‑u.part09.rar” fi ent=$(dd if="$FILE" bs=1M count=10 2>
if __name__ == "__main__": main()
def compute_sha256(file_path): h = hashlib.sha256() with open(file_path, "rb") as f: for chunk in iter(lambda: f.read(8192), b''): h.update(chunk) return h.hexdigest()