claim: Alexandria serves less than half of Egypt's imports and exports.
evidence: In cryptography , CIPHERUNICORN-E is a block cipher created by NEC in 1998 .. NEC. NEC. cryptography. cryptography. block cipher. block cipher. It was among the cryptographic techniques recommended for Japanese government use by CRYPTREC in 2003 , however , has been dropped to `` candidate '' by CRYPTREC revision in 2013 .. CRYPTREC. CRYPTREC. The algorithm has a 16-round modified Feistel network structure , with an additional key-dependent mixing function after every 2 rounds .. Feistel network. Feistel cipher. The block size is 64 bits , and the key size 128 bits .. block size. block size ( cryptography ). key size. key size. The round function is fairly complicated , split into two nearly parallel computations .. The first part -LRB- called the main stream by the designers -RRB- consists of XORs and S-box lookups , with a few choices influenced by the second part .. S-box. substitution box. This second function -LRB- called temporary key generation -RRB- uses more XORs and two operations which are equivalent to modular multiplications .. modular multiplications. modular arithmetic. Subkeys are added at various stages of both parts of the round function .. There are 4 S-boxes in all , each with 8-bit inputs and outputs .. In 2000 NEC used the same high-level structure , with more elaborate components , to design the CIPHERUNICORN-A cipher .. NEC. NEC. CIPHERUNICORN-A. CIPHERUNICORN-A. CIPHERUNICORN-E 's key schedule uses a nested Feistel network , based on some of the same building blocks as the cipher itself .. Feistel network. Feistel cipher. key schedule. key schedule. The complexity of CIPHERUNICORN-E 's round function has made it difficult to analyze .. Some limited analysis has been done on simplified variants , showing that they are likely resistant to both differential and linear cryptanalysis .. differential. differential cryptanalysis. linear cryptanalysis. linear cryptanalysis