While the website of Torproject uses a 2048 bit certificate, if Forward Secrecy ciphers are used, the key exchange is only 1024 bit: https://www.ssllabs.com/ssltest/analyze.html?d=torproject.org

EDIT: This is a question to ask people of the Torproject to change the DHE keysize.

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    I don't believe this is the place for suggestions. perhaps this will help "tor-talk@lists.torproject.org is for all discussion about theory, design, development, and use of Onion Routing. tor-dev@lists.torproject.org is for Tor research and development. For both of these mailing lists, you must subscribe before you can post."
    – puser
    May 13 '14 at 15:08
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    If you don't want to post on mailinglists I'd suggest to add a ticket to Tor's trac.
    – Jens Kubieziel
    May 14 '14 at 8:39