FR-FPE:有限基保留格式加密算法OA

Existing format-preserving encryption algorithms were vulnerable to slide attack and linear cryptanalysis at-tack,and had low efficiency.A finite radix oriented format-preserving encryption(FR-FPE)algorithm was proposed.It designed a CBC mode based on initial vector encryption mechanism and a fully associated encryption model with struc-tured tweak parameters,which could effectively defend against slide attack and linear cryptanalysis attack.A lightweight and deterministic encryption structure was designed to support plaintexts up to 192 bit and tweak parameters up to 96 bit.While ensuring the same security strength as NIST FF1,the number of block encryption calls was reduced by 45%(9 times)compared with FF1.Based on the Game-Hopping game model,the security proof of strong pseudorandom permu-tation(SPRP)for the FR-FPE algorithm was given,and the ability of the algorithm to resist sliding attacks and linear cryptanalytic attacks was quantitatively analyzed.Experimental results show that for a mixed alphanumeric dataset with radix=36,FR-FPE achieves an average increase of 26.55%in encryption times per second and 21.25%in encrypted data throughput compared to FF1.