- Fixed a NoMethodError that might occur when using the NetHttp Driver (#130 grahamkenville)
- More securely compare signatures in a way that prevents timing attacks (#56 leishman, #133 will0)
- Remove support for MD2 and MD4 hashing algorithms since they are insecure (#134 will0)
- Disallow requests that are too far in the future to limit the time available for a brute force signature guess (#119 fwininger)