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We introduce NSABC/w -- Nice-Structured Algebraic Block Cipher using w-bitword arithmetic, a 4w-bit analogous of Skipjack [NSA98] with 5w-bit key. TheSkipjack's internal 4-round Feistel structure is replaced with a w-bit, 2-roundcascade of a binary operation (x,z)\mapsto(x\boxdot z)\lll(w/2) that permutes atext word x under control of a key word z. The operation \boxdot, similarly tothe multiplication in IDEA [LM91, LMM91], bases on an algebraic group overw-bit words, so it is also capable of decrypting by means of the inverseelement of z in the group. The cipher utilizes a secret 4w-bit tweak -- aneasily changeable parameter with unique value for each block encrypted underthe same key [LRW02] -- that is derived from the block index and an additional4w -bit key. A software implementation for w=64 takes circa 9 clock cycles perbyte on x86-64 processors.

The block cipher NSABC (public domain)