Shared Secret Key Agreement


If you have a way to ensure the integrity of a freed key via a public channel, you can exchange Diffie-Hellman keys to deduct a short-term released key and then authenticate that the keys match. One option is to use a key reading, as in PGPfone. However, voice authentication assumes that it is not possible for a middle man to summon the voice of one participant in real time to another, which may be an undesirable hypothesis. These protocols can be designed to work even with a small public value, for example. B a password. Variations on this topic have been proposed for Bluetooth coupling protocols. Once this operation is complete, all participants will have the secret of gabcdefgh, but each participant will have performed only four modular exposures, instead of the eight that are implied by a simple circular arrangement. Note: It should be difficult for Alice to solve Bob`s private keys or solve for Bob for Alice`s private key. If it`s not difficult for Alice to solve Bob`s private keys (or vice versa), Eve can simply replace her own pair of private/public keys, put Bob`s public keys in her private key, create a common secret key and solve Bob`s private key (and use this to solve the shared secret key). Eve can try to choose a pair of public/private keys that allows her to easily solve Bob`s private key. encryption. The common key k is chained to the end of the initialization vector (IV) v, forming. is then used as an input for the RC4 algorithm to generate a RC4 keystream flow (v,k). The clear text P is exclusive or `ed (XOR, designated by ⊕) with the flow of words to get the encryption text: C -P ⊕ RC4 (v,k).

The following graph shows who knows what, again with non-secret values in blue and secret values in red. Here`s Eva an earpiece — she observes what`s being broadcast between Alice and Bob, but she doesn`t change the content of her communications. When we were talking about pairs of public and private keys, we talked about the problem of bootstraping in the distribution of keys: the problem of getting the public key to a reputable certification body. For key pairs, it is of the utmost importance to keep the private key secret.

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