Unsigned application problem with MD5 using WS.JAR

Does anyone know how we can get the java file upload/download to work following java updates from version8 131 onwards. I think the issue is with the WS.JAR file being signed as MD5.

I have seen a fix which requires removing the MD5 check from the java.security file. However, my IT department won't do this across the site and as more and more people update java this is becoming a big problem.

The advice is that the JAR file will need to be re-signed with a stronger algorithm or key size. Does anyone know how we can do this for WS.JAR.

Thanks

Karen