Cryptoraptor: High throughput reconfigurable cryptographic processor

An area-efficient design of reconfigurable S-box for parallel implementation of block ciphers

“…First, the proposed HS-LUT is applied in a reconfigurable cryptographic processor, which supports scores of block ciphers such as [2]. Besides, two other kinds of reconfigurable S-box [2,3] are designed in this paper for comparison.…”

“…These ciphers include different S-box substitution table structures with the four aspects mentioned in section 2.1. Additionally, the parameter RU is determined by the target performance according to the cryptographic processor in [2]. To support all the ciphers in Table I, the proposed implementation should meet constraints from the Eq.…”

“…Reconfigurable architecture, which can well balance the performance and flexibility, is a promising alternative for the implementation of block ciphers. To achieve good tradeoffs, the cryptographic function primitives of block ciphers, such as logical operation, arithmetic unit [1], permutation unit [2] and substitution box (S-box) [2,3], should be well designed. Especially, as the unique nonlinear component of the block cipher, S-box plays a crucial role in security of the cryptographic algorithm.…”

“…A storage unit is employed to store the content of the Sbox substitution table when LUT-based method is used. Since the content stored in the storage unit could be updated conveniently, this method is widely used in reconfigurable implementations of block ciphers [2,3,9,10]. However, the drawback is that it needs more hardware resource than logic-based method, especially when several different S-box operations should be supported [3].…”

“…However, the drawback is that it needs more hardware resource than logic-based method, especially when several different S-box operations should be supported [3]. To reduce the area resource, memory is formed by several small sub-memories in [2], but it is not affordable when pursuing the performance of ciphers.…”