Add hashcat's notes to the KB

knowledge base/hashcat.md

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+# Hashcat
+
+## TL;DR
+
+```sh
+# Install it.
+sudo zypper install hashcat
+
+# Add your user to the 'video' group to be able to use the GPU.
+sudo usermod -a -G 'video' 'username'
+sudo gpasswd -a 'username' 'video'
+
+# hashcat [options]... hash|hashfile|hccapxfile [dictionary|mask|directory]...
+
+# Run a benchmark.
+hashcat -b
+
+# Run a benchmark on all hash modes.
+hashcat -b --benchmark-all
+
+# Show the expected speed for a particular hash mode.
+hashcat \
+  -m 1800 -a3 -O -w4 --speed-only \
+  $(mkpasswd -m sha512crypt '1029384756') \
+  ?a?a?a?a?a?a?a?a
+
+# Try to brute-force (-a3) a `sha512crypt`ed (-m1800) string.
+# Only test 10-digits strings (--increment --increment-min 10
+# --increment-max 10 ?d?d?d?d?d?d?d?d?d?d).
+# Use all the available resources possible (-w4), including optimized kernel
+# code (-O).
+hashcat \
+  -m 1800 -a3 -O -w4 --increment --increment-min 10 --increment-max 10 \
+  $(mkpasswd -m sha512crypt '1029384756') \
+  ?d?d?d?d?d?d?d?d?d?d
+```

knowledge base/mkpasswd.md

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+# Debian's mkpasswd
+
+Crypts a given password using crypt(3).
+
+```sh
+mkpasswd [OPTIONS]... [PASSWORD [SALT]]
+```
+
+## TL;DR
+
+```sh
+# List available encrypting methods.
+mkpasswd -m -h
+
+# Return a hash of a specific method.
+mkpasswd -m 'nt' 'password'
+mkpasswd -m 'sha512crypt' 'password'
+```