Ciphers and OpenSSH

This is about how to configure OpenSSH. Especially many configuration parameters becomes aged in recent version of OpenSSH, most notably DSA keys are obsoleted and disabled by default. [more]

Design patterns revisited

Patterns: singleton, factory, factory method, abstract factory, builder, prototype, object pool, adapter, bridge, composite, decorator, facade, flyweight, proxy, chain of responsibility, command, interpreter, iterator, mediator, memento, observer, state, strategy, template method, state, strategy, visitor, null object; and also OO design principles. [more]