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