1997/12/07 by Yuri Ozhigov
Physics and Astronomy · #quant-ph
published as Complex Syst. 11 (1997) 223-232 · 10 pages, Latex
arxiv created 1997/12/07 · arxiv updated 2009/12/01
The conventional protection of information by cryptographical keys makes no sense if a key can be quickly discovered by an unauthorized person. This way of penetration to the protected systems was made possible by a quantum computers in view of results of P.Shor and L.Grover. This work presents the method of protection of an information in a database from a spy even he knows all about its control system and has a quantum computer, whereas a database can not distinguish between operations of spy and legal user.