What key does Alice use to encrypt to Bob?
public key
When Bob wants to send a message to Alice he uses his copy of her public key to encrypt the message. Alice uses her securely-stored private key to perform the decryption.
How can Bob send a private message M to Alice in a public key cryptosystem?
Public-Key Encryption First Bob buys a padlock and matching key. Then Bob mails the (unlocked) padlock to Alice, keeping the key safe. Alice buys a simple lockbox that closes with a padlock, and puts her message in it.
How do I find my public key private key?
You cannot generate private key from public key but you can generate public key from the private key using puttygen. As @alfasin mentioned if you could generate the private key from public key then RSA would be useless and this would make you vulnerable to attack.
How are private keys shared?
A private key, also known as a secret key, is a variable in cryptography that is used with an algorithm to encrypt and decrypt data. Secret keys should only be shared with the key’s generator or parties authorized to decrypt the data.
How public key is generated from private key?
The public key and private key are generated together and tied together. Both rely on the same very large secret prime numbers. The private key is the representation of two very large secret prime numbers.
Are private and public keys interchangeable?
Yes you can encrypt using a private key and decrypt using a public key, do NOT hand out your private key (private keys can generate public keys, and your entire encryption system is now useless), I’m assuming you want to do something like this: Server encrypts data, sends it to clients.
How the public and private key could be used for sender and receiver in sending the messages?
Public and private keys can also be used to create a digital signature. A digital signature assures that the person sending the message is who they claim to be. Typically, we use the recipient’s public key to encrypt the data and the recipient then uses their private key to decrypt the data.
How do public and private keys work?
Public and private keys form the basis for public key cryptography , also known as asymmetric cryptography. Together, they are used to encrypt and decrypt messages. If you encode a message using a person’s public key, they can only decode it using their matching private key.
Can I derive public key from private key?
The public key is derived from the private key at generation time, and with the private key at any point in the future it is possible to re-derive the public key easily. It is not feasible to go the other way. Given a public key it is not easy to derive the private key.
Is it possible to generate public key from private key?
Yes, you can do this (for some, probably not all, pkc schemes). From the ssh-keygen man file: -y Read private key file and print public key.
Is there a way to decrypt Alice’s private key?
The only way to decrypt Alice’s private key is with her public key, which Bob can access. By signing the message with her private key, Alice ensures the authenticity of the message and shows that it really did come from her. Public and private key pairs form the basis for very strong encryption and data security.
How does Bob use encryption in Alice in Wonderland?
If Bob needs to send Alice a confidential message, Alice must create her own pair of keys and send the public key to Bob, who can then use the encryption function to create ciphertext that only Alice can decrypt with her private key.
Why did Bob send Alice his public key?
This time there would be no witnesses. This time there will be just the dead earth, a rumble of thunder and Bob sending Alice his public key in perfect silence because Eve is simply not interested intercepting it… are you all ears?
Which is an example of a public and private key?
Public and private keys: an example Bob wants to send Alice an encrypted email. To do this, Bob takes Alice’s public key and encrypts his message to her. Then, when Alice receives the message, she takes the private key that is known only to her in order to decrypt the message from Bob.