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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
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|Designers||Vincent Rijmen and Paulo S. L. M. Barreto|
|Key sizes||128 bits|
|Block sizes||64 bits|
|Best public cryptanalysis|
|No attack better than on the first five rounds is known.|
In cryptography, KHAZAD // is a block cipher designed by Paulo S. L. M. Barreto together with Vincent Rijmen, one of the designers of the Advanced Encryption Standard (Rijndael). KHAZAD is named after Khazad-dûm, the fictional dwarven realm in the writings of J. R. R. Tolkien (see also Khazad). KHAZAD was presented at the first NESSIE workshop in 2000, and, after some small changes, was selected as a finalist in the project.
KHAZAD has an eight-round substitution-permutation network structure similar to that of SHARK, a forerunner to Rijndael. The design is classed as a "legacy-level" algorithm, with a 64-bit block size (in common with older ciphers such as DES and IDEA) and a 128-bit key. KHAZAD makes heavy use of involutions as subcomponents; this minimises the difference between the algorithms for encryption and decryption.
The authors have stated that, "KHAZAD is not (and will never be) patented. It may be used free of charge for any purpose."
Frédérik Muller has discovered an attack which can break five of KHAZAD's eight rounds. No attacks better than this are known as of August 2009.