What entities decrypt a transmission sent by a GDOI group member?
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A. B. C. D.A.
The Group Domain of Interpretation (GDOI) is a protocol used to provide secure group communications. One of the main functions of GDOI is to distribute and manage the keys used to encrypt and decrypt the group communications.
When a group member wants to send a message to the group, it encrypts the message using a group key. This group key is distributed to all the authorized group members using GDOI. When a group member receives an encrypted message, it needs to decrypt it using the group key.
The question asks which entities are responsible for decrypting a transmission sent by a GDOI group member.
Option A: All group members This option is not correct because it implies that every group member has the ability to decrypt the transmission. However, only the authorized group members have access to the group key needed to decrypt the transmission.
Option B: The key server only This option is not correct because the key server is responsible for distributing the group key to the authorized group members, but it does not decrypt the transmission.
Option C: The peer that is indicated by the key server This option is correct. The key server selects the group member that should decrypt the transmission and indicates this in the GDOI message. This group member uses the group key to decrypt the transmission.
Option D: The key server and the peer that is indicated by the key server This option is not correct. The key server is only responsible for distributing the group key, not decrypting transmissions. The authorized group member indicated by the key server is responsible for decrypting the transmission using the group key.
In summary, the correct answer to the question is C: the peer that is indicated by the key server.