Cryptography ≠ security
crypto is only a tiny piece of the security puzzle
– but an important one
most systems break elsewhere
– incorrect requirements or specifications
– implementation errors
– application level
– social engineering.

Prof. Dr. Ir. Bart Preneel's closing keynote "The Cryptographic Year in Review", Information Security Solutions Europe (ISSE) 2012, Brussels, Belgium, 24 October 2012