Yes, I wouldn't worry about collisions by chance. However, there is a second aspect that is not covered here: if you rely only on saved checksums in the server, it will not check again unmodified pool files. This risks you missing file system corruption or bit rot in the backup files that were previously caught by the V3 behaviour (which periodically checksummed the pool files).
Two solutions: - put the pool in a file system with checksum verification included - use a script to periodically traverse the pool and chesum the files Best regards, Guillermo On Mon, Jun 8, 2020 at 10:58 AM G.W. Haywood via BackupPC-users <backuppc-users@lists.sourceforge.net> wrote: > > Hi there, > > On Mon, 8 Jun 2020, Jeff Kosowsky wrote: > > > ... presumably a very rare event ... > > That's putting it a little mildly. > > If it's really all truly random, then if you tried random collisions a > million times per picosecond you would (probably) need of the order of > ten trillion years to have a good chance of finding one... > > $ echo ' scale=2; 2^128 / 10^6 / 10^12 / 86400 / 365 / 10^12 ' | bc > 10.79 > > I think it's safe to say that it's not going to happen by chance. > > If it's truly random. > > -- > > 73, > Ged. > > > _______________________________________________ > BackupPC-users mailing list > BackupPC-users@lists.sourceforge.net > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users > Wiki: http://backuppc.wiki.sourceforge.net > Project: http://backuppc.sourceforge.net/ _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
