2/26/2023 0 Comments Smart card toolset crack![]() ![]() (OK, with a decent passphrase this later may outlast the Sun, but then it would be too complex to remember and even to enter frequently without mistakes.) As the attacker now has the encrypted private key, he may attempt to decrypt it with as many candidate passphrases as he wants to, and sooner or later he would eventually succeed. But what happens if this client computer gets stolen? If the passphrase is simple enough for a human to remember, it is usually simple enough for some cryptographic attack to crack. ![]() This way the user could be impersonated only by stealing his private key, something that exists only on his client computer, and even there only in a locally encrypted form, so the user has to (temporarily) decrypt it with the passphrase of the key before use. The user proved his identity by encrypting some server-generated nonce with his private key and the server verified it by decrypting it with the public half of the keypair: if the result matches the original nonce, it proves that the user has the private part of the keypair, and this confirms his identity (or defines it, depends on the viewpoint). The next step was using RSA private/public keypairs, where the public key was known by the server but the private one was kept as secret by the user. Administrators usually have higher privileges than average users, this is especially true for administrative access, that is one of the reasons why the old-fashioned telnet has been replaced by ssh.Īlthough the network traffic itself was thus protected by encryption, as long as the key of this encryption still depended on just some passwords -in the case of the PasswordAuthentication method- it was still vulnerable for dictionary attack, and as some kind of hash of this password had to be stored on server-side, it could be stolen and used for known-cyphertext attacks against the password. ![]() The security of all IT systems can be compromised only through the interfaces between them and the world, so the security measures that protect the access to such systems are highly important. ![]()
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