The ERRATA for SL 53,52,51,50 i386/x86_64 are now available from:
ftp://ftp.scientificlinux.org/linux/scientific/53,52,51,50/i386,x86_64/updates/security/

SL 50-53  gnupg2 - missing dependency

    i386

 	libksba-1.0.5-2.el5.i386.rpm
 	libksba-devel-1.0.5-2.el5.i386.rpm
 	pinentry-0.7.3-3.el5.i386.rpm
 	pinentry-gtk-0.7.3-3.el5.i386.rpm
 	pinentry-qt-0.7.3-3.el5.i386.rpm

     x86_64

 	libksba-1.0.5-2.el5.i386.rpm
         libksba-1.0.5-2.el5.x86_64.rpm
         libksba-devel-1.0.5-2.el5.i386.rpm
         libksba-devel-1.0.5-2.el5.x86_64.rpm
         pinentry-0.7.3-3.el5.x86_64.rpm
         pinentry-gtk-0.7.3-3.el5.x86_64.rpm
         pinentry-qt-0.7.3-3.el5.x86_64.rpm

-Connie Sieh