Can someone know where a private key belongs once a person have found it?
Let's say a private key copy is stored in the cloud and is found for a bad person; is it possible for that person to know where to use that private key?
Noooo. Dont ever, EVER store any private key in the cloud. If you really have to use Pcloud not Dropbox. Dropbox could be working with the NSA in snooping on its users' files.
first of all there is always options for multiple encryptions that even NSA can not break, you should look into them before doing it. you don't just put it up there un-encrypted! anybody can steal that.
second of all so what! even if NSA checks your cloud which there is no reason for it, and then another if, if they break the encryption, are you doing something illegal? are the bitcoins gained from an illegal channel or did you evade paying taxes? if not you shouldn't be worried.
Its a bad habit to do even if you encrypt your files and store it in the cloud. I dont like the idea of a hacker getting them even if I know he cant decrrypt them. Its better to store them offline.
obviously nobody likes that to happen ever, but if you learn what encryption is and how to do it right there is nothing to worry about even if a super hacker gets your encrypted wallet or private keys online.
it is going to look like this you can try and break this AES encryption all you like but you can never do it in a million years:
NL2m38orZTlMIO1QCPh+gWMGO6wC7sVLwy2b8MeIXYpiiJoIPUsQhYtakxG/KZkltIgtfIwHm4LX1tlYchQPfOVf+mQPO1EmYFYoimSsYrKiY0VE178urbbfJKQCzk1z5QyxDbRtqyiP/fHkJhvTa+xLXYxpUQrYXSSWw3v6aecaASS/CnX1f38xkaznXqN0OWbz+n/S2/G0/hofKqQhdVPNdV4IQtRXe3Uh4r3FLYS4Brj9o5VIEbulG8VmgD0yCuYtX6vnVFM4nmJ6LlPWZ4n6eVrZ3RlLx/9sC+0UeD+z2cwxvqYKagtVNd8OI+S/aT1jopEy/Rxm4RWtAuu8sUwmIUVTUYP5b47aqFO5Rul0mwUjbJRj0JflbiD8Fwt/Xh3EXow7Apf/h33W/0wWq4ZeZ1KoOL58nPsqoSkax/aLi/abfwcIleDQTDX+WTiJ9joN8Gn/43l/IofSxofNV6EoMcEw0egAnKo8D6/POZXUZTWKTK7RlS4FegRHndggiOFRerAsS8zUEM+df2tYUCMupa8/93NStO769EiX19C6yRpUB7f5n/1gestUltNIhyIxDOnZuG9HEI02xqMCbQKTUVmNPRhwUTcCtDBCy8sNkcXd9gHqykag5Sj20wcXc1DWhZ816I5zRZnSo2/MXfjVoimLO6zuwU7fu1Rpv6K8UYnKUUa06V1BqKpX6VGsdzAnW8j0DeEHKMrpCUuWNcir5P2rEmBCYCyy+zW5/6UOz/Guw+zOtzhcpENKK4v4vHyhwnTB6uS+DuPd4CNb4safEsdn2p4T+pjF93GLTbJZ8KS2P6NBBwQSZLBK34mwa9xQImdSiNwNLCRFcKi56wgEf0I/OsdV1aLoZG0B3DdtSXGZYrnQHqstD6izXSbCA/UWzzxM4i2gCVgSmjl4TlhGz4dOUnR+OJR4uOpy/np1svlzEX8//YtPFNF5xmug4wlr8DZ5ciyexg3Rd6L8y2OelcUBVatPeILl+dsZ/d+jq09VQ9ZZFC7BoJHYzHA/W4s/GPgepjKKQyRhVZP4T6tGXkWJeDLWrh60qTuaUCKOPgfXNAFZ5pgZFQF+/GBZt+hWpTYJFqqf+IP7WsadsF/3FRx8dhlqG0V9Qup5Y4HOlfFdtzL7Qn5s6K26ovDhtFhmSeBn0TVTz/vtuXgvl932uNpPt9DRv53En3kFOFeRV+OepDrD6ofBsta+7HuDwFgNx+NgpTKP+teUA8MbWKYs74DlR5RDvSnJseAYF57GaoE4NKTaYd5O+HSN6SciUDVK9K0omLpEsRbyQK3VSgjDmJljINleu5CUP9/Y4bEqPzNH4rrZGeaDFY37j2ig3IqLOv9DZpKJD7GHREhsHFGr0BzEKpgASNpoy1QvAkfH2YLYSFeJbkagvYTsMlrg9j4ftR7a4p8XGbWC200S59itERmzDSW8p3yMXLTSxkZO3ntnkXYOIthN9a2v+Y/t3hL4jBulo1R+q01K+8HCHN4d7pp7tEf/lOCVo8sa7fyHCjlzkdULxuqbKv4OAb2ltVw6YDI6O+9G8U4dfSdgcZmmAjRWML3jNqQvLVD+3H7OezHoIJd9xvzfufNkN4BTwb7KR3IfaggNe2e0yaAGcZmz7nzqUPNlNOtJLivUX+y/PO9Dn8bU5q4JVHBFwClxhN1atGgLybklTZeiliHHnckgFShvWovZOPagDGEHIqunE8g9BQn0AiaDq4Uw0k9G7oDWgQebkrAiqokoPFgf4+TqyNs51d5/PhpHt2uoStJty65b9D4FBQpYp7koVTtSX3TAMhGgOFUm4K6SqlAg+2ZRFELOXOSki4TJVgSdt1sCee1mUKXNTYBPTEhShHjC313zL4NRZm/AoYasfFQpehVvJvelVzvYHNdEZ8gVVs/fZvlo/3PzPu0V1HxjZbX77MLaWJvll6ONc5OGyzg4RyNCtVFynMZkeMz6phIv5Ls=
you can always take extra security measures like double encrypting the file, and do a password protection kind of thing on top of that, and including it among other irrelevant files which has no indication of bitcoin in them.