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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.
A sample line is: 5...Be7 6.Bc4 0-0 7.0-0 c5, and the position is equal. In this line Black can also fianchetto his bishop to g7, although this is uncommon. Bent Larsen tried this in a few games, including a draw against Mikhail Tal in 1969.
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).
The Alekhine Variation of the Ragozin Variation occurs with 5.Qa4 Nc6 6.e3 0-0 7.Qc2. A transposition into the Vienna Variation of the Queen's Gambit Declined occurs with 5.Bg5 dxc4 6.e4. An alternate line commonly played is 5.cxd5 exd5 6.Bg5 h6 7.Bh4 to avoid transposing into the Vienna.
The Zukertort Opening is a chess opening named after Johannes Zukertort that begins with the move: . 1. Nf3. Sometimes the name "Réti Opening" is used for the opening move 1.Nf3, [1] although most sources define the Réti more narrowly as the sequence 1.Nf3 d5 2.c4.
The Catalan Opening is a chess opening where White plays d4 and c4 and fianchettoes the white bishop on g2. A common opening sequence is 1.d4 Nf6 2.c4 e6 3.g3, although various other openings can transpose into the Catalan.
5.Qe3 a non-ambitious reply, often played in conjunction with Be2, 0-0, Nc3 (with or without c4), and Bd2. This system has been coined the Harikrishna System by IM Alexandru-Bogdan Banzea , [ 4 ] as it has recently been used by super grandmaster Pentala Harikrishna in over-the-board games with positive results as White.