In a certificate-less cryptography, I have learned that – to resolve the key escrow problem of IBE – the concept of a partial private key is used.
Now, consider the following Scenario:
- After verifying User's Identity, KGC generates a partial-private key for the respected user.
- After accepting the partial-private keys from the Key Generation Center (KGC), User generates a pair of public & private keys.
Question: How does the Key Generation Center know that the generated pair public & private key is computed using the sent partial-private key of the respected user?