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Gemini privacy

nothien at uber.space nothien at uber.space

Tue Mar 9 18:36:37 GMT 2021

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Phil Leblanc <philanc at gmail.com> wrote:

Given your current stats, the record padding value I suggested

previously (4,096) would be enough to almost eliminate the risk for

more than 80% of pages and significantly reduce the risk for more than

90% of pages. -- and we can agree that the one 903,321 bytes document

_will_ probably be catched whatever the record padding :-)

Do you mean "rounding up" (by adding padding) all sent data to 4,096bytes? I agree, that should do quite well to hide most Gemini data.

In conclusion, it's not Gemini's responsibility to handle these

kinds of attacks.

I disagree.

I agree with you disagreeing! :-) but I think Nothien means it is not

the responsibility of the Gemini _protocol_ to handle these attacks.

It should rather be the responsibility of Gemini capsule owners to

configure reasonable record padding for the typical documents they

publish.

Yep, that's what I mean. Thank you putting that to words neatly.

Just writing this, I am wondering... with TLS 1.3, can the _client_

request record padding for the server response?

Reading the TLS 1.3 spec[1], it appears not. Oh well.

[1]: https://tools.ietf.org/html/rfc8446#section-5.4

P.S: I've been thinking about all the issues we've come across with TLS,and I've been collecting ideas for a new transport security protocol. Iknow ~spc's stance on crypto ("get it approved by the crypto community,make an implementation, then we'll talk"), and I'm not saying we shouldswitch to a magic protocol that doesn't exist; but that we should atleast consider making a wishlist of sorts of all the things that wewould want out of a "good" transport security protocol (if you have anysuch ideas, please share them with me). I'll put up my crypto wishlistsometime soon.

~aravk | ~nothien