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It also depends on your storage system. For example, if you have de-duplication, guest VMs may be able to establish whether known blocks of data are already stored, for example: (1) create a VM and store 10,000 reference files; (2) create another VM and store 30,000 files sampled without replacement from (A) the 10,000 reference files on VM 1, (B) 10,000 new ...


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If your hashing function is secure enough this shouldn't be a problem, even if an attacker know your default value he cannot in a reasonable time find a password hashing in your default value. Anything that isn't the the result of your hashing function is a good default value (i still think you should use a random value and not your first pet name but both ...



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