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This 48-bit address space contains potentially 2 48 (over 281 trillion) possible MAC addresses. The IEEE manages the allocation of MAC addresses, originally known as MAC-48 and now called EUI-48 identifiers. The IEEE has a target lifetime of 100 years (until 2080) for applications using EUI-48 space and restricts applications accordingly.
The possible screw axes are: 2 1, 3 1, 3 2, 4 1, 4 2, 4 3, 6 1, 6 2, 6 3, 6 4, and 6 5. Wherever there is both a rotation or screw axis n and a mirror or glide plane m along the same crystallographic direction, they are represented as a fraction or n/m.
A broader family are the uniform 8-polytopes, constructed from fundamental symmetry domains of reflection, each domain defined by a Coxeter group. Each uniform polytope is defined by a ringed Coxeter-Dynkin diagram. The 8-demicube is a unique polytope from the D 8 family, and 4 21, 2 41, and 1 42 polytopes from the E 8 family.
×8 = 256: md2: 8 ×16 = 128: ×32 = 256: ×48 = 384: ×16 = 128: none 48 × 18 = 864: b n/a md4: 32 ×4 = 128: ×16 = 512: 64 16 × 3 = 48: a b s little md5: 16 × 4 = 64: ripemd: 32 ×4 = 128: ×8 = 256: ×16 = 512: 64 16 × 3 = 48: a b s little ripemd-128: 16 × 4 = 64: ripemd-256: ×8 = 256: ripemd-160: ×5 = 160: ×10 = 320: 16 × 5 = 80 ...
4-level paging of the 64-bit mode. In the 4-level paging scheme (previously known as IA-32e paging), the 64-bit virtual memory address is divided into five parts. The lowest 12 bits contain the offset within the 4 KiB memory page, and the following 36 bits are evenly divided between the four 9 bit descriptors, each linking to a 64-bit page table entry in a 512-entry page table for each of the ...
The regions can be organized into a tree, called a space-partitioning tree. Most space-partitioning systems use planes (or, in higher dimensions, hyperplanes) to divide space: points on one side of the plane form one region, and points on the other side form another. Points exactly on the plane are usually arbitrarily assigned to one or the ...
The number 18 is a harshad number in base 10, because the sum of the digits 1 and 8 is 9, and 18 is divisible by 9.; The Hardy–Ramanujan number (1729) is a harshad number in base 10, since it is divisible by 19, the sum of its digits (1729 = 19 × 91).
Formally, a message authentication code (MAC) system is a triple of efficient [4] algorithms (G, S, V) satisfying: G (key-generator) gives the key k on input 1 n, where n is the security parameter. S (signing) outputs a tag t on the key k and the input string x. V (verifying) outputs accepted or rejected on inputs: the key k, the string x and ...