Store RSA in a PEM file instead of xml

- RsaKeyGenerator automatically saves the RSA keys in a PEM file
- Corrects key bit size suggestion

pom.xml

@@ -81,6 +81,12 @@
       <version>0.9.5.2</version>
     </dependency>
 
+    <dependency>
+      <groupId>org.bouncycastle</groupId>
+      <artifactId>bcprov-jdk15on</artifactId>
+      <version>1.54</version>
+    </dependency>
+
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
@@ -101,6 +107,7 @@
       <version>1.6.4</version>
       <scope>test</scope>
     </dependency>
+
   </dependencies>
 
 </project>