Machine self replication

Let we consider a universal machine which can accomplish every task it is programmed for.

...What about the uncommon task of replicate it self?

At first glance, it seems a trivial task, straightforward: just design a mechanism that duplicates all of its parts, bolts them together, and we are obtained a clone. But John Von Neumann realised that this approach runs into a paradox he called the infinity machine problem.

We are not far from the birth of electronic calculators, and this scientist immediately pushed himself toward one of the fundamental limits of these systems.

Why is it not a banal problem?

If a machine replicates only by mechanically copying its structure, then each copy must contain the ability to copy itself again. That means the copy must contain another copy, which must contain another, and so on forever...

You end up with an infinite regress and this machine can never be fully specified or built.

A deeper solution was needed.

The Blueprint Solution

Von Neumann’s breakthrough was to separate the machine from its project.

Stuffing infinite replicas inside the machine is not an option so he proposed that a true self-replicator must carry a blueprint of itself, a symbolic description along the machinery to read and copy it as well.

Von Neumann formalized this into four components:

1. Blueprint: A finite symbolic tape that encodes the design of the machine.

2. Builder: A universal machine that can read any valid blueprint and assemble the described system.

3. Copier: A mechanism that duplicates the blueprint.

4. Controller: The manager that ensures the builder constructs the machine and attaches the copied blueprint to it.

   
   

Put together, this system produces a new machine that not only replicates the original’s structure but also carries the instructions for building yet another. The regress vanishes

because the machine doesn’t contain infinite nested copies it contains a finite blueprint plus the means to interpret and copy it.

This insight is strikingly close to how life itself works. In cells, DNA plays the role of the blueprint, the cellular machinery acts as the constructor, and the replication machinery copies the DNA for the next generation.

Von Neumann formulated this architecture before the double helix structure of DNA was even known. His abstract automata anticipated the logic of biology: that self-replication requires information plus mechanism, not endless physical copying.

We can find this concept in cyber security filed as well, what are viruses and worms if not programs that replicate themself?