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Joey Hess 2011-04-03 14:47:43 -04:00
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doc/design/encryption.mdwn
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@ -11,6 +11,8 @@ as well as the filenames. The size of the encrypted files, and access
patterns of the data, should be the only clues to what type of is stored in patterns of the data, should be the only clues to what type of is stored in
such a remote. such a remote.
[[!toc]]
## encryption backends ## encryption backends
It makes sense to support multiple encryption backends. So, there It makes sense to support multiple encryption backends. So, there
@ -94,7 +96,7 @@ for each file in the repository, contact the encrypted remote to check
if it has the file. This can be done without enumeration, although it will if it has the file. This can be done without enumeration, although it will
mean running gpg once per file fscked, to get the encrypted filename. mean running gpg once per file fscked, to get the encrypted filename.
### risks ## risks
A risk of this scheme is that, once the symmetric cipher has been obtained, it A risk of this scheme is that, once the symmetric cipher has been obtained, it
allows full access to all the encrypted content. This scheme does not allow allows full access to all the encrypted content. This scheme does not allow
@ -108,6 +110,6 @@ amelorates these type of risks by using locked memory.
This design does not support obfuscating the size of files by chunking This design does not support obfuscating the size of files by chunking
them, as that would have added a lot of complexity, for dubious benefits. them, as that would have added a lot of complexity, for dubious benefits.
If the untrusted party running the encrypted remote wants to know file sizes, If the untrusted party running the encrypted remote wants to know file sizes,
they could correlate chunks that are accessed together. Enctypting data they could correlate chunks that are accessed together. Encrypting data
changes the original file size enough to avoid it being used as a direct changes the original file size enough to avoid it being used as a direct
fingerprint at least. fingerprint at least.