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I'm using LibreOffice now, and I'm encrypting files of LO Write with VeraCrypt that have very personal content and I want to keep it secret. But I read about LO send to his web SO MUCH information, and I read an entry (that I cannot find again right now) that says he save so much secret information using LibreOffice like me, he have Comodo Firewall and he sees that the trusted files list of his Firewall, get double when he installs LO and sees that that files send a few KB of information. And he starts a difficult uninstall of LO all files.

Do you know anything about if write and open files with LibreOffice is 100% secure? Should I change to OpenOffice or any other software?

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    LibreOffice is not 100% secure. There are 0days for it out there. OpenOffice is pretty much unmaintained, so I would suggest to just keep using LibreOffice. – forest Dec 13 '17 at 6:45
  • Why is not 100%secure? if we are talking about privacy – Robertus M Dec 13 '17 at 7:54
  • Nothing is 100% secure. It doesn't have any spyware or "backdoors" that will intentionally do bad things to you by default, but it can be "hacked" by malicious documents. – forest Dec 13 '17 at 7:55
  • Unless it is encrypted by LibreOffice, wireshark or tcpdump will record all traffic and you can manually inspect it. Operating system have many background services so expect really large logs to sift through, and not all the traffic will belong to LibreOffice. And even if it is encrypted you can see the source and destination IP(s) and do whois lookup to see where the traffic is going. Obviously if you link, but not embed things in your documents it will have to reach out to the source material in order to display it. – cybernard Dec 15 '17 at 15:30
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I think it is safe to say that LibreOffice does not contain any backdoors or spyware and does not send your files over the Internet. LibreOffice is as secure as any other word processor such as OpenOffice or Microsoft Word. You could even say it is more secure, since it is open source and it would be pretty hard to hide malicious code in it.

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    Saying something is as secure as Microsoft Word doesn't sound like very high praise – thomasrutter Dec 13 '17 at 23:56

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