The key agreement refers to a key exchange form (see also key key) in which two or more users execute a protocol in order to safely release a resulting key value. An important transport protocol can be used as an alternative to the key agreement. The distinguishing feature of a key MOU is that participating users contribute equally to the calculation of the resulting common key value (unlike a user who calculates and distributes a key value to other users). Crypto-session (CS) is a one-way or two-way media stream. A CS is protected by a single instance of a data security protocol. The original and still most famous protocol for the key agreement was proposed by Diffie and Hellman (see the key agreement Diffie Hellman) as well as their concept of cryptography with public keys. Basically, Alice and Bob users send key public values through an uncertain channel. Based on the knowledge of the corresponding private keys, they are able to correctly and safely calculate a common key value. An earpiece, however, is not capable of this key with only the knowledge of… In general, the key DH agreement method is used more (both in terms of calculation and bandwidth) than previous ones and requires quotas as in the case of the public key. However, it has the advantage of offering perfect forward secrecy (PFS) and flexibility in allowing implementation in several finite groups. We have already mentioned that offline dictionary attacks have an impact on authentication; Now back to that. As explained above, a PAKE protocol cannot leak a single bit of password information.

This means that no mechanism can be available to ensure that the correct password is used by the other party directly at both ends of the protocol. For example, the password cannot fill out an equation that can be verifiable effectively, which is, by chance, the error of the dummy protocol in fig. e49.5.C`s exactly how a digital signature scheme works, and the decisive difference is that the long-term secret is cryptographically strong. That`s the method behind STS. An example of a key transport protocol is when a player generates a symmetrical key and encrypts the key under the receiver`s public key using asymmetric cryptography. This is a key transport protocol (sometimes called a key encapsulation mechanism or KEM) and not a key agreement, because the key depends on the inputs of one party: the sender. The key is generated by one party and then transported to the other party. In the classic key exchange, the exhaustive search for the right long-term key simply cannot be made possible by construction: it is totally random and very long. On the other hand, a password is probably short and is created from a small set of values with a coincidence less than the ideal, which allows an exhaustive search. We illustrate the impact of this phenomenon with a “stupid” protocol. The key exchange protocol is considered an important part of the cryptographic mechanism to protect end-to-end communications security.