These files are not mirrored on this site anymore. Please download them from the original ftp servers linked below.

README.idea	   	                 1 KB        13.09.2001 10:13
README.rsa		                 1 KB        09.06.2001 16:43
idea.c (at least 1.06/1.07)	        13 KB        28.09.2001 00:32
idea.c-1999 (at least 1.06/1.07)        16 KB        12.05.2000 00:00
idea.c.gz-2002 (at least 1.22)        5216 B         16.06.2002 00:32  
idea.c.gz.sig                           65 B         16.06.2002 00:32
gnupg146_idea.c (at least with 1.46)  5216 B         24.04.2004
gnupg146_idea.c.gz.sig                  65 B         24.04.2004
rsa.c			             14834 KB        07.09.2001 14:12
rsaref.c	                     20657 KB        26.06.2001 12:48

(the dates given are original ones from gnupg's sites and ftp.netsw.org/crypto/systems/gnupg/rsaidea for the old idea module; please note there are no valid signature files for any of the modules available).
The latest idea modules are hosted on ftp://ftp.gnupg.dk/pub/contrib-dk. Please also see this document for more information or have a look at GnuPG's faqs as for idea and check the signatures with GnuPG's developers PGP keys available on the key servers.