Research on revocable identity-based encryption algorithm on lattice
The lattice revocable identity-based encryption algorithm(RIBE)can not only effectively solve the problem of revoking or renewing a user key in real life,but it also resists quantum algorithm attacks,which has attracted the interest of many cryptography researchers.In this paper,the genera-tion algorithms such as system public key,user private key and renewal key in the RIBE scheme are improved by using the aspherical Gaussian sampling technique based on approximate trapdoor.The key size is reduced to improve the spatial efficiency of the scheme.By comparing the decryption error rate with the original system at the same level,it was observed that the storage space of the main pub-lic keys,master private keys,user private keys,update keys and decryption keys of this system was reduced to a certain extent compared with the original system.In particular,for different security lev-els,under the premise of maintaining the same decryption error rate,the size of MPK of this scheme was reduced by 32.29％to 41.93％,the size of MSK reduced by 31.25％to 38.70％,the size of user private key and decryption key reduced by 59.13％to 69.95％,and the size of ciphertext re-duced by 32.27％to 41.91％.
cell codeRIBEgaussian sampling of aspheric surface
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