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RC2 was a 64-bit block cipher developed in 1987. RC3 was broken before ever being used. RC4 is a stream cipher. RC5 is a 32/64/128-bit block cipher developed in 1994. RC6, a 128-bit block cipher based heavily on RC5, was an AES finalist developed in 1997.
Encryption is done in 2-word blocks. u = w/8 – The length of a word in bytes. b – The length of the key in bytes. K[] – The key, considered as an array of bytes (using 0-based indexing). c – The length of the key in words (or 1, if b = 0). L[] – A temporary working array used during key scheduling, initialized to the key in words.
Currently, the best public cryptanalysis of CAST-256 in the standard single secret key setting that works for all keys is the zero-correlation cryptanalysis breaking 28 rounds with 2 246.9 time and 2 98.8 data.
An m×n S-box can be implemented as a lookup table with 2 m words of n bits each. Fixed tables are normally used, as in the Data Encryption Standard (DES), but in some ciphers the tables are generated dynamically from the key (e.g. the Blowfish and the Twofish encryption algorithms).
Custom flying field of the HHAMS Aerodrome created for RealFlight 7.5 Custom flying field of the HHAMS Aerodrome created for Phoenix RC. An RC flight simulator is a computer program that allows pilots of radio-controlled aircraft to practice on a computer, without the risk and expense of damaging a real model.
The gameplay of OpenRCT2 is, by nature of the project, very similar to the original RollerCoaster Tycoon 2 game upon which it is based. However, the re-implementation features a number of changes: [6] Fast-forward mode; Multiplayer support; Support for high-definition resolutions. [7] Support for higher framerates. [8]
Josef Průša was a core developer of the RepRap project who had previously developed a PCB heated "print bed". He adapted and simplified the RepRap Mendel design, reducing the time to print 3D plastic parts from 20 to 10 hours, changing to the use of two Z-axis motors to simplify the frame, and including 3D printed bushings in place of regular bearings.
Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include: