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SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published in 2001. [3] [4] They are built using the Merkle–Damgård construction, from a one-way compression function itself built using the Davies–Meyer structure from a specialized block cipher.
The value of the real in dollars continued to fluctuate but generally upwards, so that by 2005 the exchange was a little over US$1 = R$2. In May 2007, for the first time since 2001 (six years), the real became worth more than US$0.50 — even though the Central Bank, concerned about its effect on the Brazilian economy, had tried to keep it ...