In a photoresist composition and a method of forming a pattern using the same, the photoresist composition includes about 0. Methods and structures according to various embodiments of the invention provide minimally invasive techniques and devices that facilitate placement of sensingdriver assemblies in a middle ear using a trans-canal implantation technique. Fresh blades are disposed in the front compartment and are advanced one at a time out of the compartment by a carrier that is controlled by an actuator on the handle. For high-risk sources, a false authentication process is employed having non-differential successfail response behavior that does not expose the information, such as consistent presentation of a service denial message irrespective of whether the request identifies a valid existing user account, preventing an enumeration attack.