Certificateless Group to Many Broadcast Proxy Reencryptions for Data Sharing towards Multiple Parties in IoTs

Table 1

Comparison of the security requirements.

	Group ownership	Bilinear pairing	Key escrow problem	Receiver anonymity	Re-Key genneration
Wang and Wang [53]	Not provided	Used	Insecure	Offer	KGC/BC
Maiti and Misra [54]	Not provided	Used	Insecure	Offer	Sender
Sun et al. [55]	Not provided	Used	Insecure	Offer	Sender
Yin et al. [56]	Not provided	Used	Insecure	Offer	Sender
Chunpeng et al. [57]	Not provided	Used	Insecure	Offer	Sender
Kim et al. [51]	Not provided	Not used	Secure	Offer	Sender
Proposed scheme	Provided	Not used	Secure	Offer	Sender