> > > considering that people notice a matter of < 10%, people are going to > > > > Where can we observe those, pray tell ? > > A great many place, but probably the place it's most easily noticed is on > the freeway (where it's also a matter of speed). When was the last time you > saw a number of people (there will of course be 1 occassionally) that > voluntarily does 10% under the speed limit? Very often (at least everywhere
This is unrelated to computer storage use. 14% slower and smaller disk is a non-issue. It's like having 26 Gb disk instead of 30 Gb or 3 MB/s throughput instead of 3.4. Who cares. > > Can you provide example in real file system terms where 1 in 65536 leaks > > anything ? > > Sure, current disks are 80 GB or larger for a decent sized setup. Since > we've got 512 KB blocks that leaves 152587 blocks on the disk. If each block > has a 1 in 65536 chance of collision, there will be somewhere in the > neighborhood of 100000 collisions on the disk. Since on the average > businessman's computer there will be an enormous quantity of Word DOC files, > all of which have the same header (standard Word header followed by standard Collision means same plaintext to the same ciphertext. The collision happens on the cypher block basis, not on disk block basis. 80 Gb drive has around 5 billion 128-bit blocks, and if all were the same plaintext there would be about 80 thousand same ones of each of possible 65536 128-bit values. This has nothing to do with practical security. You imply more than *hundred thousand* of identical-header word *docs* on the same disk and then that identifying several of these as potential word docs is a serious leak. ===== end (of original message) Y-a*h*o-o (yes, they scan for this) spam follows: Yahoo! Health - your guide to health and wellness http://health.yahoo.com
