If you consider openssl, Beata, please first read: http://www.zdnet.com/how-the-nsa-and-your-boss-can-intercept-and-break-ssl-7000016573/ http://www.zdnet.com/blog/security/openssl-fixes-six-security-holes/9975 http://www.openssl.org/news/secadv_20120104.txt Beata Zalewska wrote, On 18/07/2013 02:46: > hi there > > i am not John, but Beata but would be grateful if you could let me > know - if possible - how openssl works and how to use it for symmetric > encryption > > many thanks > > beata
