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Title:
The block cipher NSABC (public domain)
Authors: Alice Nguyenova-Stepanikova, Tran Ngoc Duong
Abstract:We introduce NSABC/w – Nice-Structured Algebraic Block Cipher using w -bit word arithmetics, 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.
ePrint: https://eprint.iacr.org/2011/237
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