E2

E2, e2, E02, E.II, e² or E-2 may refer to:

Biology and medicine

Mathematics and technology

E2 (cipher)

In cryptography, E2 is a symmetric block cipher which was created in 1998 by NTT and submitted to the AES competition.

Like other AES candidates, E2 operates on blocks of 128 bits, using a key of 128, 192, or 256 bits. It uses a 12-round Feistel network. E2 has an input transformation and output transformation that both use modular multiplication, but the round function itself consists only of XORs and S-box lookups. The single 8×8-bit S-box is constructed from the composition of an affine transformation with the discrete exponentiation x¹²⁷ over the finite field GF(2⁸). NTT adopted many of E2's special characteristics in Camellia, which has essentially replaced E2.

References

Everything2

Everything2 (styled Everything₂), or E2 for short, is a collaborative Web-based community consisting of a database of interlinked user-submitted written material. E2 is moderated for quality, but has no formal policy on subject matter. Writing on E2 covers a wide range of topics and genres, including encyclopedic articles, diary entries (known as "daylogs"), poetry, humor, and fiction.

History

The predecessor of E2 was a similar database called Everything (later labeled "Everything2" or "E2") which was started around March 1998 by Nathan Oostendorp and was initially closely aligned with and promoted by the technology-related news website Slashdot (by virtue of various key principals having attended the Holland Christian High School), even sharing (at the time) some administrators. The E2 software offered vastly more features, and the Everything1 data was twice incorporated into E2: once on November 13, 1999, and again in January 2000.

The Everything2 server used to be colocated with the Slashdot servers. However, some time after OSDN acquired Slashdot, and moved the Slashdot servers, this hosting was terminated on short notice. This resulted in Everything2 being offline from roughly November 6 to December 9, 2003. Everything2 was then hosted by the University of Michigan for a time. As the Everything2 site put it on October 2, 2006: