KGC forward secrecy Sample Clauses

KGC forward secrecy. Compromise of the KGC master key s does not enable one to reveal previously established session keys. Actually, a KGC does not gain any advantage over an outside attacker in obtaining the session key between two ar- bitrary entities. This is one of the key advantages of certificateless schemes over identity-based cryptography. In the session key K = ê(QB, P)a(s+xB)·ê(QA, P)b(s+xA), an outside attacker does not know s nor the pair (xA, xB). Therefore, solving (s + xA) can be reduced to solving a single variable xA. Thus, an outside attacker must solve ê(QB, P)axB · (QA, P)bxA in order to obtain the session key. An attacker with access to the KGC master key s, on the other hand, may solve parts of the session key K. To demonstrate, the session key may alternatively be written as K = ê(QB, P)as · ê(QB, P)axA · ê(QA, P)bs · ê(QA, P)bxB . We see that this adver- sary can easily solve ê(QB, P)as and ê(QA, P)bs. Thus, the adversary must solve ê(QB, P)axA · ê(QA, P)bxB , and we see that problem is essentially the same as that of an outside attacker.
Sample 1
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KGC forward secrecy. If the master key of KGC is corrupted, the security of session keys previously established should not be compromised by any entity.
Sample 1
KGC forward secrecy. CL-PKC based schemes do not have key escrow problem. If an adversary has the KGC’s master private key, s, the previously established session keys will not be exposed. Although the adversary may generate the partial private key, both the short-term and long-term private keys of an entity are needed in order to compute the session key.
Sample 1

Related to KGC forward secrecy

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