Neither says in specs what is the hashing algorithm they are using, In 2016 security of all these blockchains and cryptos are not a main concern in the future it will be.
On this subject of security i thought i would just let everyone know about Curecoin, they are currently running testnet for SigmaX a spin off of the new tech developed for Curecoin 2.0. They are currently testing new code for quantum-resistant signatures and mini-blockchain just to name a few features in the new code. If ur interested to know more u can browse
https://bitcointalk.org/index.php?topic=603757.3220 just a few pages either side will have you up to date.
Yes, was reading this article few days back but couldn't find what are they using to encrypt this SigmaX coin (terrible name btw), though they are not the only ones besides Nexus focusing on this aspect, MaidSafe is using RSA 4096,
http://blog.maidsafe.net/2015/01/29/consensus-without-a-blockchain/ go to Cryptographic Signatures in the second paragraph.
Problem with RSA is this
http://danielpocock.com/rsa-key-sizes-2048-or-4096-bits.
I trust more Elliptical-Curve Cryptography than RSA
SigmaX and Curecoin 2.0 will both use merkle tree signatures, you can read from their white paper