Disadvantages of Public-Key Crypto!Calculations are 2-3 orders of magnitude slower •Modular exponentiation is an expensive computation •Typical usage: use public-key cryptography to establish a shared secret, then switch to symmetric crypto –We’ll see this in IPSec and SSL!Keys are longer •1024 bits (RSA) rather than 128 bits (AES) These applications use public-key encryption, which uses two keys: one to encrypt the data, and one to decrypt it. In SSL/TLS you use the certificates of both parties for authentication. The data which is encrypted using the public key of a user can only be decrypted using the private key of … Private Key; Public Key; Private Key: The account holder holds a key which is a random hexadecimal number.Private Key will be confidential to the account holder rather than exposed to the real world. Users would store their public keys in each system they want to use, while at the some time their private keys would be kept secure on the computers, the users want to use to connect with those secured systems. The idea is to assign a pair of asymmetric keys to every user. Keep in mind that authentication is different from authenticity. Abstract: Kerberos is a trusted third party authentication protocol based on symmetric key cryptography. Public key encryption, or public key cryptography, is a method of encrypting data with two different keys and making one of the keys, the public key, available for anyone to use. Message authentication can be provided using the cryptographic techniques that use secret keys as done in case of encryption. Public-key authentication with Secure Shell is more secure than password authentication, as it provides much stronger identity checking. DH is not part of the authentication process. The other key is known as the private key. After you have authenticated the parties, you share a secret key for your symmetric encryption. Public key authentication offers a solution to these problems. The motivation for using public key authentication over simple passwords is security. This paper studies how Kerberos authentication standard can be extended to support public key cryptography. Authentication based on public key cryptography has an advantage over many other authentication schemes because no secret information has to be shared by the entities involved in die exchange. This keys are exchanged using DH key exchange. A user (claimant) attempting to authenticate oneself must use a private key to digitally sign a random number challenge issued by the verifying entity. As the name implies, the public key is often publicly available, but the private key has to be kept secret. For establishing MAC process, the sender and receiver share a symmetric key K. Scribd is the world's largest social reading and publishing site. 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