Rsyncrypto: Difference between revisions

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{{Wiki  
{{Wiki <!--see 'Template:Wiki' for full detail-->
| logo             = http://www.lingnu.com/images/lingnu_banner_logo.png
|name            = Rsyncrypto -<br><small>''Rsync Friendly File Encryption''</small>
| URL               = http://rsyncrypto.lingnu.com/
|URL              = https://web.Archive.org/web/20190210013846/https://Rsyncrypto.Lingnu.com/index.php/Home_Page
| recentchanges URL = http://rsyncrypto.lingnu.com/index.php/Special:Recentchanges
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|founder          = Shachar Shemesh
| license           = YourWiki'sLicense
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== Description ==
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|wikiFactor URL= http://Rsyncrypto.Lingnu.com/index.php/Special:Popularpages
}}(Page count as of: 20YY-MM-DD<br>wikiFactor as of: 2012-MM-DD)<!--YYYY-MM-DD; manually add/amend date when stats are verified and/or updated-->


Sometimes it is necessary to store files on a remote server.
Ideally, you want to both:


* (a) backup the latest version of your files quickly, even over low-bandwidth link to a remote server. Simple solution: use rsync.
The '''Rsyncrypto''' [[wiki]] is a place to discuss Rsyncrypto and related tools and techniques. This Rsyncrypto wiki was {{tag|FoundedIn2008|founded June 2008}}, and powered by {{tag|MediaWiki}}, but in 2019, the wiki was recreated using the same original URL, but all [[edit history]], and nigh-on all content was lost.
* (b) keep the contents of your files private. Simple solution: send only encrypted versions of the files. Keep the key local.


Alas, the solutions interfere -- solutions to one won't work with any solution to the other.
;''Why is Rsyncrypto
Sometimes it is necessary to store files on a remote [[:Category:Server|server]].  This is typically needed for backup purposes.  When that is done, there are two concerns that need to be addressed, ideally, you want to both:
#How to keep the {{tag|privacy}} of the files stored?
#How to keep bandwidth usage to a minimum?
Both problems have rather simple solutions:
#Encrypt the files prior to sending them, keep the key locally.
#Use [https://rsync.samba.org rsync] to only transfer the changes.
There is just one problem: the two solutions contradict.  Plain mode {{Wp|encryption}} of files hide the specific changes to the file, making rsync useless at detecting in-file changes.  This is where rsyncrypto comes to the rescue.


The rsyncrypto tool is designed to do both simultaneously.
;''What is Rsyncrypto
Rsyncrypto is a modified encryption scheme.  It is based on industry standard {{Wp|Advanced Encryption Standard}} (AES) for symmetric encryption, as well as {{Wp|RSA (cryptosystem)|RSA}} (Rivest–Shamir–Adleman) for having different keys for each file while allowing a single key to decrypt all files.  It even uses an encryption mode that is based on {{Wp|Block cipher mode of operation#Cipher block chaining (CBC)|cipher block chaining}} (CBC).


The rsyncrypto wiki is a place to discuss rsyncrypto and related tools and techniques.
Rsyncrypto does, however, do one thing differently.  It changes the encryption schema from plain CBC to a slightly modified version.  This modification ensures that two almost identical files, such as the same file before an after a change, when encrypted using Rsyncrypto and the same key, will produce almost identical encrypted files.  This means that both objectives can be achieved simultaneously.


[[category:security]]
;''Awards
Rsyncrypto won first prize in the 2007 edition {{tag|free software}} trophy competition ([[Archive.org:20080621125440/http://www.TropheesDuLibre.org/?lang=en|Trophées du Libre]]) in the {{tag|security}} category.


{{add}}
;''Tutorials
There are some tutorials on line, which might help you with your experience with rsyncrypto:
*[[Archive.org:20160313161445/http://archive09.Linux.com/feature/125322|Efficient rsyncrypto hides remote sync data]], by Ben Martin on 1 February 2008, Linux.com, via [[Archive.org]]
*https://blog.wuxinan.net/archives/86 — rsyncrypto: rsync + encryption, atppp's Blog, 7 September 2007


;''More resources
*[[Archive.org:20160815185514/http://Rsyncrypto.Lingnu.com/index.php/Todo|Plans for future versions]]
*[[Archive.org:20160815185121/http://Rsyncrypto.Lingnu.com/index.php/Algorithm|Details about the rsyncrypto algorithm]]


related wiki:
;''Related wiki
* [[Unison wiki]]
*[[Unison Wiki]]


<!--
;''External links
add description of the wiki here and
*[[Archive.org:20080827160608/http://rsyncrypto.svn.SourceForge.net/viewvc/rsyncrypto/|rsyncrypto repository]] — at [[SourceForge|SourceForge.net]], via [[Archive.org]]
remove this comment and the dummy
categories/tag below and add your own


if the wiki's main language isn't English, you
[[Category:Monobook]]
can have one description in English and another
[[Category:Timeless]]
in the wiki's main language, if you speak it.
[[Category:Vector]]
 
[[category:FirstAdditional]]  
 
tagging: {{tag|Wikis to add}}
-->
 
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| pages = <!-- type number of pages here, if unknown leave void -->
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| wikiFactor = <!-- optional. plain wiki factor value -->
| wikiFactor URL = <!-- optional. external link to data base for wiki factor calc. -->
}}

Revision as of 20:21, 3 September 2021

https://www.Lingnu.com/images/lingnu_banner_logo.png
Rsyncrypto -
Rsync Friendly File Encryption
Recent changes • [No WikiNode] • [No About] • [No Mobile URL]
Founded by: Shachar Shemesh
Status: Dormant
Language: English
Edit mode: LoginToEdit
Wiki engine: MediaWiki
Wiki license: Creative Commons Attribution-Share Alike"Creative Commons Attribution-Share Alike" is not in the list (Custom license, Attribution to contributing authors, Copyright to contributing authors, Site retains copyright, WTFPL, Licence Art Libre, Open Content License, Apache License, BSD Documentation License, FreeBSD Documentation License, ...) of allowed values for the "Wiki license" property.
Main topic: Software
Wiki size: unknown size see stats
wikiFactor: 1 info / verify

(Page count as of: 20YY-MM-DD
wikiFactor as of: 2012-MM-DD)


The Rsyncrypto wiki is a place to discuss Rsyncrypto and related tools and techniques. This Rsyncrypto wiki was founded June 2008, and powered by MediaWiki, but in 2019, the wiki was recreated using the same original URL, but all edit history, and nigh-on all content was lost.

Why is Rsyncrypto

Sometimes it is necessary to store files on a remote server. This is typically needed for backup purposes. When that is done, there are two concerns that need to be addressed, ideally, you want to both:

  1. How to keep the privacy of the files stored?
  2. How to keep bandwidth usage to a minimum?

Both problems have rather simple solutions:

  1. Encrypt the files prior to sending them, keep the key locally.
  2. Use rsync to only transfer the changes.

There is just one problem: the two solutions contradict. Plain mode encryption of files hide the specific changes to the file, making rsync useless at detecting in-file changes. This is where rsyncrypto comes to the rescue.

What is Rsyncrypto

Rsyncrypto is a modified encryption scheme. It is based on industry standard Advanced Encryption Standard (AES) for symmetric encryption, as well as RSA (Rivest–Shamir–Adleman) for having different keys for each file while allowing a single key to decrypt all files. It even uses an encryption mode that is based on cipher block chaining (CBC).

Rsyncrypto does, however, do one thing differently. It changes the encryption schema from plain CBC to a slightly modified version. This modification ensures that two almost identical files, such as the same file before an after a change, when encrypted using Rsyncrypto and the same key, will produce almost identical encrypted files. This means that both objectives can be achieved simultaneously.

Awards

Rsyncrypto won first prize in the 2007 edition free software trophy competition (Trophées du Libre) in the security category.

Tutorials

There are some tutorials on line, which might help you with your experience with rsyncrypto:

More resources
Related wiki
External links
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