-----BEGIN PGP SIGNED MESSAGE----- A number of months ago, I discovered that various Macintosh "unused diskspace" wipe utilities (Norton, Burn) fail to wipe the unused slackspace at the end of the last block allocated to a file. This leaves NumberOfFiles*512Bytes/2 = several kB of recoverable data on your average drive. I had assumed that this data was left there by other files previously using the same block. This would certainly be a problem. But I discovered that matters are much worse. The Macintosh file system will always write an entire block. The extra data can therefore not come from an old file. It comes from the memory space immediately following the data to be written. This is a very serious security risk. Your decrypted secret key, ANYTHING in memory might be written to disk and remain there, unerasable by disk wipe utilities. I would appreciate some comments. - --- [This message has been signed by an auto-signing service. A valid signature means only that it has been received at the address corresponding to the signature and forwarded.] -----BEGIN PGP SIGNATURE----- Version: 2.6.2 Comment: Gratis auto-signing service iQBFAwUBMICWfCoZzwIn1bdtAQFDyAF/QLI0RJQ/E2+wktITd+3SBCCB8L24Y/vV rq0hPikG9pELYcC/bMwXvD+utoW/E8NQ =IHqi -----END PGP SIGNATURE-----