Dover Castle Dover Castle Dover Castle is a medieval castle in Dover, Kent, England. It was founded in the 11th century and has been described as the "Key to England" due to its defensive significance throughout history. It is the largest castle in England. This site may have been fortified with earthworks in the Iron Age or earlier, before the Romans invaded in AD43. This is suggested on the basis of the unusual pattern of the earthworks which does not seem to be a perfect fit for the medieval castle. Excavations have provided evidence of Iron Age occupation within the locality of
Known-key distinguishing attack is fewer than half the block size). These attacks have also been applied to reduced-round Threefish (Skein) and Phelix. Known-key distinguishing attack In cryptography, a known-key distinguishing attack is an attack model against symmetric ciphers, whereby an attacker who knows the key can find a structural property in cipher, where the transformation from plaintext to ciphertext is not random. There is no common formal definition for what such a transformation may be. The chosen-key distinguishing attack is strongly related, where the attacker can choose a key to introduce such transformations. These attacks do not directly compromise the confidentiality of ciphers,