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SELF-REPLICATING CODE LOOPS. "Is it possible for a computer program to write its own programs?" https://lnkd.in/ddNuyJD View in LinkedIn

"VIRUSES are primarily a set of instructions, which execute over time on some hardware. Viruses are based on algorithms, which essentially represent a pattern in time. Viruses are not entities that survive on their own, but rather rely on a host entity to execute and reproduce. In most cases, the host entity is a computer on which the virus resides and propagates." https://lnkd.in/dSdcD2A View in LinkedIn

GENERATIONS. "Since the first viruses were written, we have seen what may be classified as five “generations” of viruses. Each new class of viruses has incorporated new features that make the viruses more difficult to detect and remove." https://lnkd.in/eCG7b3z View in LinkedIn

DEFINITION OF COMPUTER VIRUS: "a virus as a piece of code with two characteristics: 1. At least a partially automated capability to reproduce. 2. A method of transfer which is dependent on its ability to attach itself to other computer entities (programs, disk sectors, data files, etc.) that move between these systems.” https://lnkd.in/eCG7b3z View in LinkedIn

"INTRUSIVE VIRUSES operate by overwriting some or all of the original host code with viral code. The replacement might be selective, as in replacing a subroutine with the virus, or inserting a new interrupt vector and routine. The replacement may also be extensive, as when large portions of the host program are completely replaced by the viral code." https://lnkd.in/eCG7b3z View in LinkedIn

"LIVING ORGANISMS are very complicated aggregations of elementary parts, and by any reasonable theory of probability or thermodynamics highly improbable. That they should occur in the world at all is a miracle of the first magnitude; the only thing which removes, or mitigates, this miracle is that they reproduce themselves. Therefore, if by any peculiar accident there should ever be one of them, from there on the rules of probability do not apply, and there will be many of them, at least if the milieu is reasonable. (John von Neumann, Theory of Self-Reproducing Automata). https://lnkd.in/dvTG5_v View in LinkedIn

ADD-ON VIRUS. "Most viruses are add-on viruses. They function by appending their code to the host code, and/or by relocating the host code and inserting their own code to the beginning. The add-on virus then alters the startup information of the program, executing the viral code before the code for the main program." https://lnkd.in/eCG7b3z View in LinkedIn

COMPUTING MOLECULES. "Paul Rothemund showed chemical processes could perform not just complex, but universal computation: a combination of DNA strands and restriction enzymes could, in principle, simulate a Turing machine. Thus, the simplest kinds of chemistry can, in theory, perform any computation.” https://lnkd.in/dhc7k7H View in LinkedIn

"A SHELL VIRUS is one that forms a “shell” (as in “eggshell” rather than “Unix shell”) around the original code." https://lnkd.in/eCG7b3z View in LinkedIn

"COMPANION VIRUS, is not really a virus at all, but a form of trojan horse that uses the execution path mechanism to execute in place of a normal program. Unlike all other viral forms, it does not alter any existing code in any fashion: companion viruses create new executable files with a name similar to an existing program, and chosen so that they are normally executed prior to the “real” program." https://lnkd.in/eCG7b3z View in LinkedIn