Re: [tor-talk] Tor Design : Differents keys used for connection.

[Brieuc BarthÃlemy <bri@xxxxxxxxx>]

Hey,
just to be sure what I understand:

"It sounds like the 'ephemeral keys' you mention could be the circuit-level
 keys, that is, the symmetric keys negotiated by the circuit handshake and
used for the lifetime of that circuit."

Is it the 128-bit AES key? They are talking about in point 4.1 of the
article?

Kind regards,

Brieuc BarthÃlemy

www.brieuc.be | www.fatcha.be | carolofornie.be

@bribarthelemy
<http://t.sidekickopen52.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJN7t5XZsd0s2vN1pNBMlRbFvlW8qC6LR56dQ67f1Vjyr202?t=https%3A%2F%2Ftwitter.com%2Fbribarthelemy&si=5080546748661760&pi=8fd7c06f-aaf1-4c7b-e5b3-f8195527b3af>

On Thu, May 19, 2016 at 11:03 PM, Brieuc BarthÃlemy <bri@xxxxxxxxx> wrote:

> Hi Roger,
> Glad YOU answered me, ashamed I didn't find it. ;)
>
> Thank you so much!
>
> Brieuc BarthÃlemy
>
> www.brieuc.be | www.fatcha.be | carolofornie.be
>
> @bribarthelemy
> <http://t.sidekickopen52.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJN7t5XZsd0s2vN1pNBMlRbFvlW8qC6LR56dQ67f1Vjyr202?t=https%3A%2F%2Ftwitter.com%2Fbribarthelemy&si=5080546748661760&pi=73b41fc0-af6b-4631-8feb-df53cef3e691>
>
> On Thu, May 19, 2016 at 10:21 PM, Roger Dingledine <arma@xxxxxxx> wrote:
>
>> On Thu, May 19, 2016 at 10:13:54PM +0200, Brieuc BarthÃlemy wrote:
>> > In point 4 (Page 4) the article talks about differents keys:
>> > - A long term identity key: to sign TLS certificate, OR route descriptor
>> > and to sign directories.
>> > - A short-term onion key: used to decrypt requests from users.
>> > - Ephemerals keys ( first words on page 5 )
>> > - And "link keys" for TLS communication.
>> >
>> > My question is: do you think the last two of them ( Ephemerals and link
>> > eyes ) are the same one ?
>> > Because I don't find any clear informations about those "ephemerals"
>>
>> You might enjoy
>> https://www.torproject.org/docs/faq#KeyManagement
>>
>> It sounds like the 'ephemeral keys' you mention could be the circuit-level
>> keys, that is, the symmetric keys negotiated by the circuit handshake
>> and used for the lifetime of that circuit.
>>
>> --Roger
>>
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>
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