That does sound like CAO [1,3,4], from the CACE [2] project. [1] https://eprint.iacr.org/2005/160 https://eprint.iacr.org/2005/160 [2] http://www.cace-project

That does sound like CAO [1,3,4], from the CACE [2] project. [1] https://eprint.iacr.org/2005/160 https://eprint.iacr.org/2005/160 [2] http://www.cace-project.eu/ http://www.cace-project.eu/ [3] http://www.cace-project.eu/downloads/deliverables-y2/CACE_D5.2_M18.pdf http://www.cace-project.eu/downloads/deliverables-y2/CACE_D5... [4] http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.113.8971&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.113...