Preventing attack of ciphertexts Sample Clauses

Preventing attack of ciphertexts. Simple encryption of a message does not absolutely assure that the message will not be revealed during or after key discovery. That is, if MRS scheme is used in the shared-key discovery phase, nodes face to another threat caused by guessing secret keys and striking weak points of encryption. After an adversary receives all the mes- sages from anyone in the network, the node can guess any secret keys held by the other side due to a weakness of encrypted values, which received from the other side. Let’s suppose that an adversary received a list of encrypted values (i.e. rEK (D0 ), rEK (D1), ..., rEK (Dm −1) ) from any legitimate node. If two parties have any common key (i.e., ci ) in their key chains, the encrypted value(s) which corresponds to it are decrypted to zero. Otherwise all encrypted values are decrypted to nonzero. However, even if node A has no knowledge about r, he can obtain factorization ex- pressions as follows: DK (rE K (Di )) = r × (Yi )m , i = 0...m − 1
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