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% Packages
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\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{rschacht}
\pdfinfo{
  /Title (mobile.pdf)
  /Creator (Cheatography)
  /Author (rschacht)
  /Subject (Mobile Cheat Sheet)
}

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% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
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% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Mobile Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{rschacht} via \textcolor{DarkBackground}{\uline{cheatography.com/23536/cs/11637/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}rschacht \\
  \uline{cheatography.com/rschacht} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 29th April, 2017.\\
   Updated 1st May, 2017.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{4}

\begin{tabularx}{3.833cm}{x{1.61351 cm} x{1.81949 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Security Basics}}  \tn
% Row 0
\SetRowColor{LightBackground}
Symmetric Key & One key is shared by two users both encryption \& decryption (substiution cipher, aes, des) \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
Assymetric & Public and Private Key \tn 
% Row Count 7 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Substitution Ciper & Mono-alphabetic cipher 2\textasciicircum{}n/2 \tn 
% Row Count 9 (+ 2)
% Row 3
\SetRowColor{white}
Diffie-Helman Exchange & Exchanging secret keys over insecure medium. Known large prime and base shared and a secret integer \tn 
% Row Count 14 (+ 5)
% Row 4
\SetRowColor{LightBackground}
DES & 56-bit symmetric key, 64bit plain text US standard \tn 
% Row Count 17 (+ 3)
% Row 5
\SetRowColor{white}
AES & Replaces DES 128 bit \tn 
% Row Count 18 (+ 1)
% Row 6
\SetRowColor{LightBackground}
Axor0, AxorA & A, 0 \tn 
% Row Count 19 (+ 1)
% Row 7
\SetRowColor{white}
Main Sec. Probs In Mobile? & Config. management, excessive privleges, privacy violations, poor session management \tn 
% Row Count 23 (+ 4)
% Row 8
\SetRowColor{LightBackground}
Most problematic part in mobil apps? & Android abstraction layer \tn 
% Row Count 25 (+ 2)
% Row 9
\SetRowColor{white}
Preventing replay attacks? & Use a nonce \tn 
% Row Count 27 (+ 2)
% Row 10
\SetRowColor{LightBackground}
Pros of Symmetric Keys & No worry of replay or man in the middle attacks \tn 
% Row Count 30 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.61351 cm} x{1.81949 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Security Basics (cont)}}  \tn
% Row 11
\SetRowColor{LightBackground}
Agreement on shared key & diffie helman or KDC \tn 
% Row Count 2 (+ 2)
% Row 12
\SetRowColor{white}
Certificate Auth & Binds pub key to part. entity. E registers with CA. When Alice wants bobs pub key, get the certificate, apply CA pub key and get bobs pub key. \tn 
% Row Count 9 (+ 7)
% Row 13
\SetRowColor{LightBackground}
Symmetric and Public Key Problems & Sym: establish shared key? (deffie-helman, KDC), Public Key(Man in middle) use CA \tn 
% Row Count 13 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.30454 cm} x{2.12846 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{power/energy}}  \tn
% Row 0
\SetRowColor{LightBackground}
factors that affect power & power affects temp, but energy doesn't \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
equations & power/area proportional to temp \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
associations & higher current implies high power which increases cpu frequency \tn 
% Row Count 7 (+ 3)
% Row 3
\SetRowColor{white}
thermal runaway & power -\textgreater{} temp -\textgreater{} resistance decrease -\textgreater{} current increase I (cycle) \tn 
% Row Count 10 (+ 3)
% Row 4
\SetRowColor{LightBackground}
energy & asffects battery life, power * time = E \tn 
% Row Count 12 (+ 2)
% Row 5
\SetRowColor{white}
energy harvesting & solar, wind -\textgreater{} high capacity, low leakage (low discharge), low capacity, high leakage (quick discharge), appliance \tn 
% Row Count 17 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Certificate Authority}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493656915_Screen Shot 2017-05-01 at 9.41.34 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.57918 cm} x{1.85382 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Recent Trends in Security}}  \tn
% Row 0
\SetRowColor{LightBackground}
ID vs Auth & Auth = username + pass, ID = passwd \& something like biometric \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Data injection & sending false radio signal to pace maker and inducing heart attack \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
Threat Model/Attack model & What the system thinks about the model. Believes attacker is much more powerful than he actually is. Attack model attacker believes it knows a lot about the system \tn 
% Row Count 15 (+ 8)
% Row 3
\SetRowColor{white}
Key establishment in physi. sec. & Done using human body \tn 
% Row Count 17 (+ 2)
% Row 4
\SetRowColor{LightBackground}
Ways to fool machine & brute force feature guess, generate signal (generative), evasion, poison \tn 
% Row Count 21 (+ 4)
% Row 5
\SetRowColor{white}
Evasion attack & create points to gain access without getting caught, alter features \tn 
% Row Count 25 (+ 4)
% Row 6
\SetRowColor{LightBackground}
Poison attack & attacker can see the training set, injects their own data at key points, skews the lines \tn 
% Row Count 30 (+ 5)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.57918 cm} x{1.85382 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Recent Trends in Security (cont)}}  \tn
% Row 7
\SetRowColor{LightBackground}
Biometric signals & Signals that don't change like fingerprints \tn 
% Row Count 3 (+ 3)
% Row 8
\SetRowColor{white}
Physiological signals & hard because constantly changing \tn 
% Row Count 5 (+ 2)
% Row 9
\SetRowColor{LightBackground}
Hardening Technique & instead of line, have piecewise curves, or instead of line use polygon(polytope) \tn 
% Row Count 9 (+ 4)
% Row 10
\SetRowColor{white}
Internet Control Protocol Messages & agent advertisement, agent solicitation, registration request, registration reply \tn 
% Row Count 13 (+ 4)
% Row 11
\SetRowColor{LightBackground}
Foreign Agent & Consumes less ip addresses than mobile host \tn 
% Row Count 16 (+ 3)
% Row 12
\SetRowColor{white}
security performance tradeoff & Increase in security strength -\textgreater{} hardening Hardening implies more difficult classification boundaries May increase False positives or negatives How to find a balance between security strength and performance? Multi-objective optimization problem \tn 
% Row Count 28 (+ 12)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
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\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Hardening Technique}}  \tn
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\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Internet of Things}}  \tn
% Row 0
\SetRowColor{LightBackground}
Challenges of CPS & hard to know how many sensors to use, what data to collect \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Cyber Physical Systems & embedding sensors into physical devices \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Human to Human interaction & person a thinks about a color red and that dot is displayed to another person in another country \tn 
% Row Count 10 (+ 5)
% Row 3
\SetRowColor{white}
3 charactertistics of IOT devices & anytime, anything, any place connetion \tn 
% Row Count 12 (+ 2)
% Row 4
\SetRowColor{LightBackground}
USN application layer & where apps are built to perform tasks using the sensors through middleware \tn 
% Row Count 16 (+ 4)
% Row 5
\SetRowColor{white}
middleware (Drivers) & allows you to build apps on top of iot sensors \tn 
% Row Count 19 (+ 3)
% Row 6
\SetRowColor{LightBackground}
sensor networking layer (bottom) & sensors are launched in environment and report to usn \tn 
% Row Count 22 (+ 3)
% Row 7
\SetRowColor{white}
Difference between gps and tower based location management? & gps needs clear line of sight and is more accurate. Tower based management is bad if you're not near tower, accessibility is less than gps. \tn 
% Row Count 29 (+ 7)
% Row 8
\SetRowColor{LightBackground}
what is iot & Network of Physical Objects embedded systems with electronics, software, sensors enable objects to exchange data with manufacturer, operator, other devices through network infrastructure allow remote control direct integration  computer + physical world Result:  automation in all fields \tn 
% Row Count 44 (+ 15)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.33887 cm} x{2.09413 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Challenges in Security}}  \tn
% Row 0
\SetRowColor{LightBackground}
Challenges in medical apps & resource constraints in sensors, poor software dev support, real-time requirements for health apps \tn 
% Row Count 5 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Network Sec}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493656750_Screen Shot 2017-05-01 at 9.38.38 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{challenges cps}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493657381_Screen Shot 2017-05-01 at 9.49.15 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{thread indexing}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493657540_Screen Shot 2017-05-01 at 9.51.55 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{RSA Example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493494637_Screen Shot 2017-04-29 at 12.36.59 PM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{RSA Continued}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493656831_Screen Shot 2017-05-01 at 9.39.55 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Diffie-Helman}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493656881_Screen Shot 2017-05-01 at 9.40.57 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{System Model}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493656977_Screen Shot 2017-05-01 at 9.42.30 AM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.0299 cm} x{2.4031 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{CUDA}}  \tn
% Row 0
\SetRowColor{LightBackground}
CUDA basics & Terminology  Host – The CPU and its memory (host memory)  Device – The GPU and its memory (device memory \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
\_\_global\_\_ &  As before, \_\_global\_\_ is a CUDA C keyword meaning — add() will execute on the device — add() will be called from the host \tn 
% Row Count 10 (+ 5)
% Row 2
\SetRowColor{LightBackground}
memory management & Host and device memory are distinct entities — Device pointers point to GPU memory  May be passed to and from host code  May not be dereferenced from host code — Host pointers point to CPU memory  May be passed to and from device code  May not be dereferenced from device code \tn 
% Row Count 21 (+ 11)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Threat Model}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{3.833cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rschacht_1493501382_Screen Shot 2017-04-29 at 2.28.37 PM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}