human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "towards security of additive layer manufacturing"
  Abstract: Additive Layer Manufacturing (ALM), also broadly known as 3D printing, is a new technology to produce 3D objects. As an opposite approach to the conventional subtractive manufacturing process, 3D objects are created by adding thin material layers over layers. Until recently, they have been used, mainly, for plastic models. However, the technology has evolved making it possible to use high-quality printing with metal alloys. Agencies and companies like NASA, ESA, Boeing, Airbus, etc. are investigating various ALM technology application areas. Recently, SpaceX used additive manufacturing to produce engine chambers for the newest Dragon spacecraft. BAE System plans to print on-demand a complete Unmanned Aerial Vehicle (UAV), depending on the operational requirements. Companies expect the implementation of ALM technology will bring a broad variety of technological and economic benefits. This includes, but not limited to, the reduction of the time needed to produce complex parts, reduction of wasted material and thus control of production costs along with minimization of part storage space as companies implement just-in-time and on-demand production solutions. The broad variety of application areas and a high grade of computerization of the manufacturing process will inevitably make ALM an attractive target for various attacks.

Connected through hyperedge HE-1 (induced by source paper "detecting cyber physical attacks in additive manufacturing using digital audio signing"):
  with members:
    - "a hazard analysis technique for additive manufacturing"
    - "dr0wned cyber physical attack with additive manufacturing"

Connected through hyperedge HE-2 (induced by source paper "dr0wned cyber physical attack with additive manufacturing"):
  with members:
    - "a hazard analysis technique for additive manufacturing"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CR(Cryptography and Security)