Was (wer) ist Liskov - definition

The Liskov substitution principle (LSP) is a particular definition of a subtyping relation, called strong behavioral subtyping, that was initially introduced by Barbara Liskov in a 1988 conference keynote address titled Data abstraction and hierarchy. It is based on the concept of "substitutability" a principle in object-oriented programming stating that an object (such as a class) and a sub-object (such as a class that extends the first class) must be interchangeable without breaking the program.

<programming, theory> (LSP) The principle that object-oriented functions that use pointers or references to a base class must be able to use objects of a derived class without knowing it. Barbara Liskov first wrote it as follows: If for each object o1 of type S there is an object o2 of type T such that for all programs P defined in terms of T, the behaviour of P is unchanged when o1 is substituted for o2 then S is a subtype of T. A function that violates the LSP uses a reference to a base class and must know about all the derivatives of that base class. Such a function violates the open/closed principle because it must be modified whenever a new derivative of the base class is created. [Liskov, B. Data Abstraction and Hierarchy, SIGPLAN Notices. 23(5), May 1988]. (2001-09-14)

Disk encryption is a special case of data at rest protection when the storage medium is a sector-addressable device (e.g.