The Trip to TLS Land Using the WSA Tobias Mayer, Consulting Systems Engineer BRKSEC-3006 Me…
The Trip to TLS Land using the WSA Tobias Mayer, Consulting Systems Engineer BRKSEC-3006 Me… CCIE Security #14390, CISSP & Motorboat driving license… Working in Content Security & IPv6 Security tmayer{at}cisco.com Writing stuff at “blogs.cisco.com” Agenda • Introduction • Understanding TLS • Configuring Decryption on the WSA • Troubleshooting TLS • Thoughts about the Future • Conclusion For Your Reference • There are (many...) slides in your print-outs that will not be presented. • They are there “For your Reference” For Your Reference Microsoft and Google pushing encryption • Microsoft pushing TLS with PFS • Google, FB, Twitter encrypting all traffic • HTTPS usage influencing page ranking on google • Deprecate SHA1, only SHA2+ • Browser Vendors aggressively pushing https • Problems with older TLS versions leading to upgrade of servers to newer protocols and ciphers • Poodle, Freak, Beast, …. Google Search Engine • Google ranking influenced by using HTTPS • http://blog.searchmetrics.com/us/2015 /03/03/https-vs-http-website-ssl-tls- encryption-ranking-seo-secure- connection/ Understanding TLS TLS Versions • SSLv3, 1996 • TLS 1.0, 1999, RFC2246 • TLS 1.1, 2006, RFC4346 • Improved security • TLS 1.2, 2008, RFC5246 • Removed IDEA and DES ciphers • Stronger hashes • Supports authenticated encryption ciphers (AES-GCM) • TLS 1.3, currently Internet Draft Attacks… • POODLE • SSLv3 Problems with Padding, turn of SSLv3 • BEAST • Know issues in CBC mode, use TLS 1.1/1.2 with non-CBC mode ciphers (GCM) • CRIME/BREACH • Compression Data Leak, disable
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