PKG will be sending the Private key,so it may not be secure,some one may get the private key,how to overcome this problem in IBE. Please help am unable to justify.
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Possible duplicate of IBE without key escrow – kelalaka Nov 09 '18 at 17:38
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https://crypto.stackexchange.com/questions/42879/how-are-private-keys-handed-to-users-in-identity-based-encryption – Youssef El Housni Nov 09 '18 at 18:05