I think that Barnabas could have written it. He would have been familiar with Paul's theology. And the difference in style from Paul's other writings could be accounted for in this way as well. Also, it seems to be written by a second generation believer (Heb 2:3-4).

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Larry Bray
Elder Elect - Reformed Presbyterian Church of Boothwyn, PCA
Boothwyn, PA - http://www.rpcb.org/

Free Online Reformed Seminary - http://www.tnars.net

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"The best Christian is still a poor Christian" - R.B. Kuiper