security - Inner workings of Git integrity check -


After reading, and seeing a little bit on git source, I have a question that the internal work of GIT Integrity Check. Reference claims that it is not possible to reduce git to learn about GIT without it. In addition, git stores are in the form of snapshots instead of deltas, so there is no cross dependency which I know in the hash value.

So my question is, is it possible that it is possible to remove the last commitment (without deleting the code) without anybody, without even knowing about the git is? How to commit somewhere in the middle?

Every git object is identified by any one. This is a cryptographic checksum of the object type and content.

ID 5f95c9f850b19b368c43ae39 9cc831b17a26a5ac : 

  tree 9 72825cf23ba10bc49e81289f628e06ad44044ff Parent 9c8ce7397bac108f83d77dfd96786edb28937511 Author Juno C Hamano & lt; Gitster@pobox.com> 1392406504 -0800 Commutator Junio ​​C. Hamano & lt; Gitster@pobox.com> 1392406504 -0800 Git 1.9.0 Sign-Off-By: Junio ​​C. Hamano & lt; Gitster@pobox.com>   
 If you change some part of this commitment, you will need to exclude its checksum at  5f95c9f850b19b368c43ae399cc831b17a26a5ac , believe it is the same Committed, although it is different though, because it is theoretically possible (due to), it is nothing that you have never seen off-hand (and in fact no SHA-1 collision, as far as I know Is: 2  160  is a very large number, even in meditation ).  
 Note that the  tree  associated with this commitment is  972825cf23ba10bc49e81289f628e06ad44044ff . Its contents are too long to reproduce perfectly again, but they start like this:  
  100,644 BLOB 5e98806c6cc246acef5f539ae191710a0c06ad3f 100,644 BLOB b5f9defed37c43b2c6075d7065c8cbae2b1797e1 .gitignore 100,644 BLOB 11057cbcdf4c9f814189bdbf0a17980825da194c .mailmap 100,644 BLOB 536e55524db72bd2acf175208aef4f3dfc148d42 COPYING 040,000 trees 47fca99809b19aeac94aed024d64e6e6d759207d Documentation 100,755 Blob 2b97352dd3b113b46bbd53248315ab91f0a9356b.gitattributes GIT-version-jane   
 This tree has listed files with its SHA-1s. This tree is identified with all its contents checksum, all sub-trees and all IDs of blobs.  
 If you want to change the tree associated with the committed, then you have to change something. Blobs (s) and / or subhead (s) will have separate IDs with new blobs, which are the top-level tree Id, which will change the string after the word  tree  in the code, which will change the id of the committed.  
 If you want to remove the commitment before the overall committed graph, then you have to change some Commit-Id after the word  parent  in the child. This means that you have to change that commitment ID, and this change will be bubble through all the commands made later, by changing the ID of the branch note tip (This is why others have an impact on it, so their The Ribasi code enormously envy.)  
 This is an interlinked ID that is called one. This allows security claims.

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