Date: Thu, 14 Dec 2006 23:31:51 +0100 From: Erik Norgaard <norgaard@locolomo.org> To: Fabian Keil <freebsd-listen@fabiankeil.de> Cc: freebsd-questions@freebsd.org Subject: Re: How safe is encrypted disks? (data integrity) Message-ID: <4581D0D7.7030501@locolomo.org> In-Reply-To: <20061214132434.5ac20b82@localhost> References: <457C686E.5050504@locolomo.org> <20061214132434.5ac20b82@localhost>
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This is a cryptographically signed message in MIME format. --------------ms060506040304000805070702 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Fabian Keil wrote: > Erik Norgaard <norgaard@locolomo.org> wrote: > >> I have been thinking to make /home on my laptop encrypted - seems like a >> good idea if it gets stolen. Now, how safe is this? Not in terms of the >> strength of the encryption algorithm, but in terms of integrity. > > I have no insight on the code, but as nobody else answered, > my response may be better than nothing. > >> What happens in case of power failure, the battery runs out or system >> crashes for whatever reason? > > I have my home slice encrypted with GELI for several month now > and so far I didn't notice any effects on the data integrity. > > I experienced several system crashes and one or two power failures > do to empty battery but I didn't lose any data already saved > on the disk (that I know of). > > The only inconvenience is that the system boots to single-user > mode if the home slice isn't clean and I then have to fsck it > manually. > > At that point the password for the key is already entered, > so I'm not sure why the slice can't be fscked automatically. > It could be the .eli extension, but I didn't investigate this > any further. Thanks, reading man-pages and stuff I think I have understood that sectors are encrypted individually, so errors in one sector does not affect the decryption of other sectors. Is this correctly understood? It's a mess though if you have to manually run fsck. I can't figure out why either: if you have attached the device it ought to be transparrent. The geli man-page claims you can even encrypt the root device - wonder how fsck will work then... Cheers, Erik -- Ph: +34.666334818 web: http://www.locolomo.org --------------ms060506040304000805070702 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIK6DCC BXAwggRYoAMCAQICBEVUK6IwDQYJKoZIhvcNAQEFBQAwMTELMAkGA1UEBhMCREsxDDAKBgNV BAoTA1REQzEUMBIGA1UEAxMLVERDIE9DRVMgQ0EwHhcNMDYxMTE1MDgzMTU0WhcNMDgxMTE1 MDkwMTU0WjB1MQswCQYDVQQGEwJESzEpMCcGA1UEChMgSW5nZW4gb3JnYW5pc2F0b3Jpc2sg dGlsa255dG5pbmcxOzAUBgNVBAMUDUVyaWsgTvhyZ2FhcmQwIwYDVQQFExxQSUQ6OTgwMi0y MDAyLTItNTQ0MzY5NzY5MzE1MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC1/K6+GVcF UvoWJpyfhzWbu8qEOB8jU17A0dpmts7RT+ODkYq0lxJCcvvdSXNQQurvYwaPISA+EMRy+rIm rjhoyxhsM9w/XC7gELqkr1XbGt3wR0KLr5ZcRfD4HqrWM1Eh1OYxTXKod6Ox/FAqzDAy91x8 XCZzsHtiBCdgMSYxqwIDAQABo4ICzjCCAsowDgYDVR0PAQH/BAQDAgP4MCsGA1UdEAQkMCKA DzIwMDYxMTE1MDgzMTU0WoEPMjAwODExMTUwOTAxNTRaMIIBNwYDVR0gBIIBLjCCASowggEm BgoqgVCBKQEBAQEDMIIBFjAvBggrBgEFBQcCARYjaHR0cDovL3d3dy5jZXJ0aWZpa2F0LmRr L3JlcG9zaXRvcnkwgeIGCCsGAQUFBwICMIHVMAoWA1REQzADAgEBGoHGRm9yIGFudmVuZGVs c2UgYWYgY2VydGlmaWthdGV0IGfmbGRlciBPQ0VTIHZpbGvlciwgQ1BTIG9nIE9DRVMgQ1As IGRlciBrYW4gaGVudGVzIGZyYSB3d3cuY2VydGlmaWthdC5kay9yZXBvc2l0b3J5LiBCZW3m cmssIGF0IFREQyBlZnRlciB2aWxr5XJlbmUgaGFyIGV0IGJlZ3LmbnNldCBhbnN2YXIgaWZ0 LiBwcm9mZXNzaW9uZWxsZSBwYXJ0ZXIuMEEGCCsGAQUFBwEBBDUwMzAxBggrBgEFBQcwAYYl aHR0cDovL29jc3AuY2VydGlmaWthdC5kay9vY3NwL3N0YXR1czAgBgNVHREEGTAXgRVub3Jn YWFyZEBsb2NvbG9tby5vcmcwgYQGA1UdHwR9MHswS6BJoEekRTBDMQswCQYDVQQGEwJESzEM MAoGA1UEChMDVERDMRQwEgYDVQQDEwtUREMgT0NFUyBDQTEQMA4GA1UEAxMHQ1JMMTU1NzAs oCqgKIYmaHR0cDovL2NybC5vY2VzLmNlcnRpZmlrYXQuZGsvb2Nlcy5jcmwwHwYDVR0jBBgw FoAUYLWF7FZkfhIZJ2cdUBVLc647+RIwHQYDVR0OBBYEFPd+a0ceJ9JmK934UXsB3G0mjv+f MAkGA1UdEwQCMAAwGQYJKoZIhvZ9B0EABAwwChsEVjcuMQMCA6gwDQYJKoZIhvcNAQEFBQAD ggEBAE9KhX+l/ZcnhvGPhHyWnJspyCXSiuqZ+GlgMdcKXtlu8kXsqNzfDe9qSs93++zJS+HT vAW0QgyIxjY1VpgCqgyjU8e2d2D1eSRMDB09WViZk8oZkvOy0Mq3yy//CLSw3gQbXNZF+Yt+ htss+FD+idACVyRBQqlcHuaxjguyzZkK0fGBN5H5nsklDySQCU7X0i3egeIiL7zlV3cjp9KT 12tNG4jfQTaSUzBkz0R+x+Jcdyp6AI9Qg3H1iGDDI58aCTY5ohQBpDsUcLr6U842IACNCeub qDP6nDo5lnMEXwGH/RO8r4supCf5wrNRjqEX/vokUzB5QfDGtmxxZkycaaQwggVwMIIEWKAD AgECAgRFVCuiMA0GCSqGSIb3DQEBBQUAMDExCzAJBgNVBAYTAkRLMQwwCgYDVQQKEwNUREMx FDASBgNVBAMTC1REQyBPQ0VTIENBMB4XDTA2MTExNTA4MzE1NFoXDTA4MTExNTA5MDE1NFow dTELMAkGA1UEBhMCREsxKTAnBgNVBAoTIEluZ2VuIG9yZ2FuaXNhdG9yaXNrIHRpbGtueXRu aW5nMTswFAYDVQQDFA1FcmlrIE74cmdhYXJkMCMGA1UEBRMcUElEOjk4MDItMjAwMi0yLTU0 NDM2OTc2OTMxNTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAtfyuvhlXBVL6Fiacn4c1 m7vKhDgfI1NewNHaZrbO0U/jg5GKtJcSQnL73UlzUELq72MGjyEgPhDEcvqyJq44aMsYbDPc P1wu4BC6pK9V2xrd8EdCi6+WXEXw+B6q1jNRIdTmMU1yqHejsfxQKswwMvdcfFwmc7B7YgQn YDEmMasCAwEAAaOCAs4wggLKMA4GA1UdDwEB/wQEAwID+DArBgNVHRAEJDAigA8yMDA2MTEx NTA4MzE1NFqBDzIwMDgxMTE1MDkwMTU0WjCCATcGA1UdIASCAS4wggEqMIIBJgYKKoFQgSkB AQEBAzCCARYwLwYIKwYBBQUHAgEWI2h0dHA6Ly93d3cuY2VydGlmaWthdC5kay9yZXBvc2l0 b3J5MIHiBggrBgEFBQcCAjCB1TAKFgNUREMwAwIBARqBxkZvciBhbnZlbmRlbHNlIGFmIGNl cnRpZmlrYXRldCBn5mxkZXIgT0NFUyB2aWxr5XIsIENQUyBvZyBPQ0VTIENQLCBkZXIga2Fu IGhlbnRlcyBmcmEgd3d3LmNlcnRpZmlrYXQuZGsvcmVwb3NpdG9yeS4gQmVt5nJrLCBhdCBU REMgZWZ0ZXIgdmlsa+VyZW5lIGhhciBldCBiZWdy5m5zZXQgYW5zdmFyIGlmdC4gcHJvZmVz c2lvbmVsbGUgcGFydGVyLjBBBggrBgEFBQcBAQQ1MDMwMQYIKwYBBQUHMAGGJWh0dHA6Ly9v Y3NwLmNlcnRpZmlrYXQuZGsvb2NzcC9zdGF0dXMwIAYDVR0RBBkwF4EVbm9yZ2FhcmRAbG9j b2xvbW8ub3JnMIGEBgNVHR8EfTB7MEugSaBHpEUwQzELMAkGA1UEBhMCREsxDDAKBgNVBAoT A1REQzEUMBIGA1UEAxMLVERDIE9DRVMgQ0ExEDAOBgNVBAMTB0NSTDE1NTcwLKAqoCiGJmh0 dHA6Ly9jcmwub2Nlcy5jZXJ0aWZpa2F0LmRrL29jZXMuY3JsMB8GA1UdIwQYMBaAFGC1hexW ZH4SGSdnHVAVS3OuO/kSMB0GA1UdDgQWBBT3fmtHHifSZivd+FF7AdxtJo7/nzAJBgNVHRME AjAAMBkGCSqGSIb2fQdBAAQMMAobBFY3LjEDAgOoMA0GCSqGSIb3DQEBBQUAA4IBAQBPSoV/ pf2XJ4bxj4R8lpybKcgl0orqmfhpYDHXCl7ZbvJF7Kjc3w3vakrPd/vsyUvh07wFtEIMiMY2 NVaYAqoMo1PHtndg9XkkTAwdPVlYmZPKGZLzstDKt8sv/wi0sN4EG1zWRfmLfobbLPhQ/onQ AlckQUKpXB7msY4Lss2ZCtHxgTeR+Z7JJQ8kkAlO19It3oHiIi+85Vd3I6fSk9drTRuI30E2 klMwZM9EfsfiXHcqegCPUINx9YhgwyOfGgk2OaIUAaQ7FHC6+lPONiAAjQnrm6gz+pw6OZZz BF8Bh/0TvK+LLqQn+cKzUY6hF/76JFMweUHwxrZscWZMnGmkMYICKjCCAiYCAQEwOTAxMQsw CQYDVQQGEwJESzEMMAoGA1UEChMDVERDMRQwEgYDVQQDEwtUREMgT0NFUyBDQQIERVQrojAJ BgUrDgMCGgUAoIIBRzAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEP Fw0wNjEyMTQyMjMxNTFaMCMGCSqGSIb3DQEJBDEWBBSkFXW3fBIH5kb4ZH03Y0QjuXVeYzBI BgkrBgEEAYI3EAQxOzA5MDExCzAJBgNVBAYTAkRLMQwwCgYDVQQKEwNUREMxFDASBgNVBAMT C1REQyBPQ0VTIENBAgRFVCuiMEoGCyqGSIb3DQEJEAILMTugOTAxMQswCQYDVQQGEwJESzEM MAoGA1UEChMDVERDMRQwEgYDVQQDEwtUREMgT0NFUyBDQQIERVQrojBSBgkqhkiG9w0BCQ8x RTBDMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMC BzANBggqhkiG9w0DAgIBKDANBgkqhkiG9w0BAQEFAASBgD0l6+qW+3AVZTyEzHg24WBmzVnu sAYIaQPhQLeO1fvIRpSmM6aOkqLWvfOec21Dk8kdcqfMRCM2BolKffJtdePLiKcYI+HvdKES CRFMlt7qJ54DDB6MV2Cbv+hdrzpygqZaXkPCvgYh1+6IZwHZBqEA3JaxsC1+sPcmut9VrDiz AAAAAAAA --------------ms060506040304000805070702--
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