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In the Internet of Things world and especially when we are going to protect the data transmitted by an embedded system from prying eyes through encryption algorithms (AES, DES, 3DES, RSA, ...) and with related network protocols (SSL, TLS , DTLS, ...), correct date/time on our board plays a fundamental role.
In fact, the encryption algorithms are strongly based on Pseudor-Random Number Generators (PRNG), which often needs to use the current date/time as a "seed" of the generation. Being pseudo-random generators and not real generators, it is important that for each system boot the "seed" is different otherwise the generated sequence is the same as the earlier boot and therefore predictable.
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