If you PGP encrypted your disks using RSA1024 and someone stole you machine or laptop, you would hope they couldn't recover your data. Just imaging your doctor, your local bank manager or government employee losing their laptop and the thief's using it to get the password and having access to all your and their data in less than 100 hours.
Not so much a "perfectly safe and viable cryptosystem" anymore.
It's perfectly safe because those hard disks would not be in a system performing the cryptographic operations. A side channel attack via DPA only works when the encrypted data is also located on the system doing the encryption.
Another analog to this would be hitting a combination lock with a hammer until it broke, and then saying that there was a fundamental flaw with lock combinations.
But a physical break in to a credit card company could end up yielding millions of credit card numbers. Albeit it's probably not very likely, but if there are people as daring as bank robbers, it doesn't completely leave the scope of feasibility.
Comments
Not so much a "perfectly safe and viable cryptosystem" anymore.