3-way lamp

A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. Unlike an incandescent lamp controlled by a dimmer, each of the filaments operates at full voltage, so the color of the light does not change over the three steps of light available. Certain compact fluorescent lamp bulbs are designed to replace 3-way incandescent bulbs, and have an extra contact and circuitry to bring about similar light level control.

Lamp bulbs with dual (carbon) filaments were built as early as 1902 to allow adjustable lighting levels. Large lamps of 500-watt rating were used for street lighting in France, which had a second filament at 200 watts to reduce lighting costs. In 1933 in the United States, Westinghouse announced a dual-filament lamp for commercial lighting and a smaller lamp for residential use.

Three-way bulbs

A 3-way incandescent bulb has two filaments designed to produce different amounts of light.

3-Way

In cryptography, 3-Way is a block cipher designed in 1994 by Joan Daemen. It is closely related to BaseKing; indeed, the two are variants of the same general cipher technique.

3-Way has a block size of 96 bits, notably not a power of two such as the more common 64 or 128 bits. The key length is also 96 bits. The figure 96 arises from the use of three 32 bit words in the algorithm, from which also is derived the cipher's name. When 3-Way was invented, 96-bit keys and blocks were quite strong, but more recent ciphers have a 128-bit block, and few now have keys shorter than 128 bits. 3-Way is an 11-round substitution-permutation network.

3-Way is designed to be very efficient in a wide range of platforms from 8-bit processors to specialized hardware, and has some elegant mathematical features which enable nearly all the decryption to be done in exactly the same circuits as did the encryption.

3-Way, just as its counterpart BaseKing, is vulnerable to related key cryptanalysis. John Kelsey, Bruce Schneier, and David Wagner showed how it can be broken with one related key query and about chosen plaintexts.

3-Way (disambiguation)

3-Way is a block cipher.

3-Way, 3Way, three-way, or three way may also refer to:

Popular culture

Technology

3-Way (The Golden Rule)

"3-Way (The Golden Rule)" is a song recorded by American comedy music group The Lonely Island featuring American singers Justin Timberlake and Lady Gaga. It appeared as an SNL Digital Short in the May 21, 2011 episode of the sketch comedy television series Saturday Night Live (SNL), which saw Timberlake and Gaga as the host and musical guest, respectively. It was released as a single on May 24, three days after the broadcast. The R&B song was written by Andy Samberg, Akiva Schaffer, Jorma Taccone, and Timberlake while produced by The Futuristics with additional production from Asa Taccone and Ryan & Smitty. Samberg and Timberlake were nervous about presenting the idea to Gaga, who initially failed to find the humour in the song.

The music video, which aired on the SNL broadcast, is a sequel to the "Motherlover" sketch and finds Samberg and Timberlake reprising their roles from that skit as they sing about having a threesome with Gaga. The song and sketch received positive reviews from critics who called it one of the funniest moments of the episode. "3-Way (The Golden Rule)" received a nomination at the 63rd Primetime Emmy Awards for Outstanding Original Music and Lyrics, but it lost to another song from the same SNL episode.