A secure and efficient electronic medical record data sharing scheme based on blockchain and proxy re-encryption

Journal of Cloud Computing

Advances, Systems and Applications

Table 4 Communication cost

Item Scheme	Data storage phase Message Length	Data access phase Message Length
Mani et al. [18]	3056 bits	4640 bits
Chen et al. [28]	3216 bits	6096 bits
Egala et al. [39]	2720 bits	3888 bits
Ours	2880 bits	3296 bits