Keyczar is a library with similar goals to NaCl: relative ease-of-use for authenticated encryption. NaCl is using more modern cryptographic algorithms (e.g. XS

Keyczar is a library with similar goals to NaCl: relative ease-of-use for authenticated encryption. NaCl is using more modern cryptographic algorithms (e.g. XSalsa20, Poly1305, and Curve25519). These provide faster encryption with smaller keys. The elliptic curve cryptography, most notably, provides keys an order of magnitude (or two) smaller than what's available today with Keyczar/NaCl. Also, the NSA recommends you switch from RSA to ECC: http://www.nsa.gov/business/programs/elliptic_curve.shtml http://www.nsa.gov/business/programs/elliptic_curve.shtml