\url{https://www.heinlein-support.de/blog/security/perfect-forward-secrecy-pfs-fur-postfix-und-dovecot/#more-1085}
+\url{https://www.imperialviolet.org/2010/12/04/ecc.html}
+\url{http://arstechnica.com/security/2013/10/a-relatively-easy-to-understand-primer-on-elliptic-curve-cryptography}
+
+\url{https://github.com/ioerror/duraconf}
+
+\url{https://www.isecpartners.com/media/106031/ssl_attacks_survey.pdf}
\url{http://tls.secg.org} is a tool for testing interoperability of HTTPS implementations for ECC cipher suites.
+\subsection{Keylenght}
+
+\url{http://www.keylength.com} comprehensive online resource for comparison of keylenghts according to common recommendatons and standards in cryptography.
+
\subsection{RNGs}
\begin{itemize}