First, passwords are low entropy data. This makes them vulnerable to dictionary attacks, which are essentially brute force attacks. Second, passwords are often mismanaged (z.B. noted or used in multiple applications). This often leads to a password compromise that must be taken into account in the design of the PAKE. The key generator is the key generator process for cryptography. A key is used to encrypt > and decipher what data is encrypted/decrypted. Cryptography with public keys can be used to create a scalable system. One of the drawbacks of this approach is that it is richer in resources than the pre-installed key approach.
Another drawback is that, in most cases, a PKI is required to process the distribution of public keys. It is possible to use the public key as a preinstalled key (for example. B using self-signed certificates). It should also be noted that, as noted above, this method can be used to create a symmetrical key “in intermediate memory” that can be used later to create later TGKs using the preinstalled key method (the following requirement can therefore be executed more efficiently). A large number of cryptographic authentication schemes and protocols have been designed to provide authenticated key agreements to prevent man-in-the-middle and related attacks. These methods generally mathematically link the agreed key to other agreed data, such as. B The following: In general, the key agreement method of the DH is used more (both in terms of calculation and tape) than the previous and required certificates, 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.
Internet Key Exchange (IKE) is the protocol used to set up a secure and authenticated communication channel between two parties. IKE uses PKI X.509 certificates for Diffie Hellman authentication and key exchange protocol to create a secret key for joint meetings. [CHE 08] proposed a protocol for authenticating key agreements for IMS (IMSKAAP) to address the above issue. This IMSKAAP offers a secure key exchange and allows servers to support legal interceptions by integrating the benefits of the KTAP and KAAP protocols. Figure e49.5. Password authentication protocol. The exponential key exchange itself does not indicate prior agreement or subsequent authentication between participants. It has therefore been described as an anonymous key memorandum of understanding. This type of attack is probably the most important to avoid in the design of the PAKE, because an attacker does not need to be online to execute it. Offline attackers have more time and computing power for the simple reason that they cannot be interrupted.