[cies]

Not true. There are some real cryptographic realities that are based in "open" math principles.

There's also the way of most using runtimes/libraries that (constantly) have CVEs in them; and understanding why it is that these languages have CVEs in the first place (see my comment on "eval()").

[justinclift]

Also, the overly muscled guys out the front of night clubs aren't there for "obscurity" type security. ;)

[TylerE]

A cryptographic key is an obscured secret.