User authentication scheme for Open source (non-proprietary) and public domain (free). A client-server environment’s network security system. Named after Greek mythology’s fierce three-headed guard dog. At user login and every service request, it verifies the user. To encrypt data It uses private or secret keys known as ‘tickets’. Contrast to public keys. Based on symmetric key cryptography and data encryption standard algorithms, it was developed at Massachusetts Institute of Technology (MIT).

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