3

The passphrase of a GPG key only protects the specific storage of the key, i.e. it is basically a file encryption. Since the key in the computer B is only logically the same (i.e. same data) to the key on A but physically different (different file on different computer), the changes on the passphrase in A will not change anything on B. Of course this will be ...


2

No, it is incorrect. Here is a quick breakdown of how it works: First, the client contacts the server and sends a "Client Hello", to which the server replies with a "Server Hello". These messages include version numbers, supported cipher suites and more. Among others, they also include the leaf certificate, as well as all intermediate ...


1

If the clients have to be able to generate the links in offline mode, then they must have everything necessary at their disposal - they can't ask a server that might economically keep secrets. The offline requirement implies asymmetric encryption. But I would like to challenge this requirement: if the client is offline, how can they post the link to their ...


1

Isn't this painfully obvious? I look at this and I know exactly where the IV ends and the encrypted string begins. That's OK. The IV is not a secret, and an attacker does not gain any advantage by knowing which bytes in the payload contain the IV and which bytes contain the ciphertext. With other encryption tools, it is well-known how the IV is stored ...


1

Generally you'd just use RSA with OAEP padding if you want to encrypt a key. Your question however talks about exchange a key. That could also be performed using RSA-KEM. Note that RSA was often used with TLS to provide key exchange using the RSA_ cipher suites. That RSA key was part of a trusted certificate, so it also performed entity authentication. ...


1

Yes, Windows domain controllers still store unsalted MD4 password hashes, to enable legacy NTLM authentication and Kerberos authentication with the legacy rc4-hmac-md5 cipher. By default, Windows also stores three Kerberos keys for each password: two of which are derived via PBKDF2 and one via DES-based key derivation method. The MD4 hash is unsalted can be ...


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