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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.
Planned high-speed rail lines in Egypt in May 2022. The first segment is under construction, with a completion date of 2027. The second segment has been extended to the Western Desert, and has begun construction with no announced end date. Construction of the third segment is planned, and further lines have been proposed.