Macbook encryption can i power off password#

Macbook encryption can i power off password#

For instance, suppose Alice's SSH client sends the message 'Dear SSH server, please append my public key to /root/.ssh/authorized_keys - and you can know that I am authorized because I know the root password is lk23jas0' (encrypted then signed with Alice's public key), and the SSH server acts on it if the root password is correct. It could work, but it has some subtle pitfalls in some contexts, because the signature does not prove that the sender was aware of the context of the plaintext. A complete explanation would take more space than is available here, but see below for a sketch of the reasoning.ДЇor a detailed analysis about whether to sign first or encrypt first, the following is a good resource: Defective Sign & Encrypt in S/MIME, PKCS#7, MOSS, PEM, PGP, and XML. These attacks are not necessarily a problem in all scenarios, but it's best to harden the approach as much as possible. Justification: The reason to do this is to defeat some subtle attacks. Make sure you use an IND-CCA2-secure public-key encryption scheme and a UF-CMA-secure public-key signature scheme (i.e., one that is secure against existential forgery attack). Bob can decrypt, verify the signature, and confirm that this indeed came from Alice (or someone she shared her private key with). In particular, she prepends Bob's name to the message, signs this using her private key, appends her signature to the message, encrypts the whole thing under Bob's public key, and sends the resulting ciphertext to Bob. Long answer: When Alice wants to send an authenticated message to Bob, she should sign and encrypt the message. Short answer: I recommend sign-then-encrypt, but prepend the recipient's name to the message first. Assuming you are asking about public-key signatures + public-key encryption: