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All
cryptographic protocols require the generation and use of secret
values that must be unknown to |
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attackers.
Random Number Generators (RNG) serves as the fundamental building
block of all security |
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operations
as it is required to generate "seeds" for public/private key pairs
for asymmetric algorithms |
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such as RSA, DSA, and Diffie-Hellman, and to generate secret keys
for symmetric and hybrid |
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crypto-systems.
As security protocols rely on randomness of keys, RNG for cryptographic |
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applications
must meet very stringent requirements, of which the most essential
is that |
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eavesdroppers
must not be able to make any meaningful predictions about the RNG
outputs. |
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Many
existing applications utilize strong cryptographic algorithms, however,
they all start from the |
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random
"seeds" that aren't truly random and unpredictable, which weakens
the overall system |
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robustness
in security. Typical examples are those that use different timing
of system hard disk |
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drives,
system status register, two different clocking speeds, movement
of the mouse and user's |
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password.
The more predictable these "random" numbers are, the easier it is
for determined |
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eavesdropper
who have sufficient computing power to break. |
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As
shown in the following figure, the Enova True Random Number Generator
uses "white noise" as |
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the
random "seeds." It can produce values that are truly random and
non-deterministic and is not |
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usceptible
to systematically analyzed attacks. |
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