Add cryptographic signature

public_cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDLjCCAhagAwIBAgIBADANBgkqhkiG9w0BAQUFADA9MQ8wDQYDVQQDDAZzZmVy
+aWsxFTATBgoJkiaJk/IsZAEZFgVnbWFpbDETMBEGCgmSJomT8ixkARkWA2NvbTAe
+Fw0xMzAyMDMxMDAyMjdaFw0xNDAyMDMxMDAyMjdaMD0xDzANBgNVBAMMBnNmZXJp
+azEVMBMGCgmSJomT8ixkARkWBWdtYWlsMRMwEQYKCZImiZPyLGQBGRYDY29tMIIB
+IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAl0x5dx8uKxi7TkrIuyBUTJVB
+v1o93nUB9j/y4M96gV2rYwAci1JPBseNd6Fybzjo3YGuHl7EQHuSHNaf1p2lxew/
+y60JXIJBBgPcDK/KCP4NUHofm0jfoYD+H5uNJfHCNq7/ZsTxOtE3Ra92s0BCMTpm
+wBMMlWR5MtdEhIYuBO4XhnejYgH0L/7BL2lymntVnsr/agdQoojQCN1IQmsRJvrR
+duZRO3tZvoIo1pBc4JEehDuqCeyBgPLOqMoKtQlold1TQs1kWUBK7KWMFEhKC/Kg
+zyzKRHQo9yDYwOvYngoBLY+T/lwCT4dyssdhzRbfnxAhaKu4SAssIwaC01yVowID
+AQABozkwNzAJBgNVHRMEAjAAMB0GA1UdDgQWBBS0ruDfRak5ci1OpDNX/ZdDEkIs
+iTALBgNVHQ8EBAMCBLAwDQYJKoZIhvcNAQEFBQADggEBAHHSMs/MP0sOaLkEv4Jo
+zvkm3qn5A6t0vaHx774cmejyMU+5wySxRezspL7ULh9NeuK2OhU+Oe3TpqrAg5TK
+R8GQILnVu2FemGA6sAkPDlcPtgA6ieI19PZOF6HVLmc/ID/dP/NgZWWzEeqQKmcK
+2+HM+SEEDhZkScYekw4ZOe164ZtZG816oAv5x0pGitSIkumUp7V8iEZ/6ehr7Y9e
+XOg4eeun5L/JjmjARoW2kNdvkRD3c2EeSLqWvQRsBlypHfhs6JJuLlyZPGhU3R/v
+Sf3lVKpBCWgRpGTvy45XVpB+59y33PJmEuQ1PTEOYvQyao9UKMAAaAN/7qWQtjl0
+hlw=
+-----END CERTIFICATE-----

twitter.gemspec

@@ -9,6 +9,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'simple_oauth', '~> 0.2'
   spec.add_development_dependency 'bundler', '~> 1.0'
   spec.authors = ["John Nunemaker", "Wynn Netherland", "Erik Michaels-Ober", "Steve Richert"]
+  spec.cert_chain  = ['public_cert.pem']
   spec.description = %q{A Ruby interface to the Twitter API.}
   spec.email = ['nunemaker@gmail.com', 'wynn.netherland@gmail.com', 'sferik@gmail.com', 'steve.richert@gmail.com']
   spec.files = %w(.yardopts CHANGELOG.md CONTRIBUTING.md LICENSE.md README.md Rakefile twitter.gemspec)
@@ -19,6 +20,7 @@ Gem::Specification.new do |spec|
   spec.name = 'twitter'
   spec.require_paths = ['lib']
   spec.required_rubygems_version = '>= 1.3.6'
+  spec.signing_key = '/Users/sferik/.gem/private_key.pem'
   spec.summary = spec.description
   spec.test_files = Dir.glob("spec/**/*")
   spec.version = Twitter::Version