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author | Joerg Steffens <joerg.steffens@bareos.com> | 2017-08-22 13:03:10 +0300 |
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committer | Joerg Steffens <joerg.steffens@bareos.com> | 2017-08-22 13:03:10 +0300 |
commit | 8752adadd884114b0ab09dc1e4342110fc05f494 (patch) | |
tree | ea9e77ae7e63ba5159c131e1664c7df722428c71 | |
parent | 0e6914a9a2f52ac41083adf69c222f666394d9b3 (diff) |
add info about SHA256 and SHA512 signatures
-rw-r--r-- | manuals/en/main/dirdconf-fileset.tex | 46 |
1 files changed, 27 insertions, 19 deletions
diff --git a/manuals/en/main/dirdconf-fileset.tex b/manuals/en/main/dirdconf-fileset.tex index cb69e25..0f9aa01 100644 --- a/manuals/en/main/dirdconf-fileset.tex +++ b/manuals/en/main/dirdconf-fileset.tex @@ -506,30 +506,38 @@ The directives within an Options resource may be one of the following: - \item [signature={\textless}SHA1{\textbar}MD5{\textgreater}] \hfill \\ + \item [signature={\textless}MD5{\textbar}SHA1{\textbar}SHA256{\textbar}SHA512{\textgreater}] \hfill \\ + \index[dir]{signature}% + \index[dir]{Directive!signature}% +It is strongly recommend to use signatures for your backups. +Note, only one type of signature can be computed per file. + \begin{description} + \item [signature=MD5] \hfill \\ + \index[dir]{MD5}% + \index[dir]{signature!MD5}% + An MD5 signature will be computed for each files saved. Adding this + option generates about 5\% extra overhead for each file saved. In + addition to the additional CPU time, the MD5 signature adds 16 more + bytes per file to your catalog. + \item [signature=SHA1] \hfill \\ - \index[dir]{signature} - \index[dir]{SHA1} - \index[dir]{Directive!signature} - An SHA1 signature will be computed for all The SHA1 algorithm is + \index[dir]{SHA1}% + \index[dir]{signature!SHA1}% + An SHA1 signature will be computed for each files saved. + The SHA1 algorithm is purported to be some what slower than the MD5 algorithm, but at the same time is significantly better from a cryptographic point of view (i.e. - much fewer collisions, much lower probability of being hacked.) It adds - four more bytes than the MD5 signature. We strongly recommend that - either this option or MD5 be specified as a default for all files. - Note, only one of the two options MD5 or SHA1 can be computed for any - file. + much fewer collisions). + The SHA1 signature requires adds 20 bytes per file to your catalog. - \item [signature=MD5] \hfill \\ - \index[dir]{signature} - \index[dir]{MD5} - \index[dir]{Directive!signature} - An MD5 signature will be computed for all files saved. Adding this - option generates about 5\% extra overhead for each file saved. In - addition to the additional CPU time, the MD5 signature adds 16 more - bytes per file to your catalog. We strongly recommend that this option - or the SHA1 option be specified as a default for all files. + \item [signature=SHA256] \hfill \\ + \index[dir]{SHA256}% + \index[dir]{signature!SHA256}% + + \item [signature=SHA512] \hfill \\ + \index[dir]{SHA512}% + \index[dir]{signature!SHA512}% \end{description} |