deletions | additions       diff --git a/section_Security_Reliability_and_Cost__.tex b/section_Security_Reliability_and_Cost__.tex  index e0a776d..ce00b5e 100644  --- a/section_Security_Reliability_and_Cost__.tex  +++ b/section_Security_Reliability_and_Cost__.tex 
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\section{Security, Reliability and Cost}  \subsection{{Security}} \section{Security}  \textbf{Zigbee} was designed with security in mind and relies on symmetric-key encryption using 128-bit AES on both link and network layers. However, key management is prone to implementation errors and in special circumstances cryptographic key can be sent unencrypted (Zillner, 2015).