Paste #1bp -- näytä pelkkänä tekstinä -- uusi tämän pohjalta
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | Security then vs. now
2023's computer 1990's computer
- Tries to achieve boot - Has physical write protection
security by verifying on the boot disk and the
all executable code firmware chip. No untrusted code
cryptographically with can be run, and the user is in
public keys that the user full control of the system.
cannot change, effectively
making the user unable to
choose the programs that
are run on the computer
- Expansion cards have their - The DMA controller only allows
own memory controller and an expansion card to read or write
a direct access to the main to an address range that is defined
memory and can do reads and by the running program, which is
writes without the CPU usually the kernel of the operating
knowing. system.
- All peripherals use the same - Has dedicated connectors for
USB connector. The USB protocol different device types. Input
is so complex that every devices have their own connector
peripheral needs to have a that cannot be used for anything
powerful CPU in it to even else.
do the most basic tasks.
A malicious or virus-infected
peripheral device can suddenly
pretend to be a keyboard and
take full control of the computer.
|