Multiway switching

In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load (often, but not always, lighting) from more than one location. For example, this allows lighting in a hallway, stairwell, or large room to be controlled from multiple locations. While a "normal" light switch needs to be only a single pole, single throw (SPST) switch, multiway switching requires the use of switches that have one or more additional contacts and two or more wires must be run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used. Double pole, double throw switches allow control from three or more locations.

In alternative designs, low-voltage relay or electronic controls can be used to switch electrical loads, sometimes without the extra power wires.

Three-way and four-way switches

The controlled load is often a lamp, but multiway switching is used to control other electrical loads, such as an electrical outlet, fans, pumps, heaters, or other appliances. The electrical load may be permanently hard-wired, or plugged into a switched receptacle.

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.