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When one key is used for encryption and a different key is used for decryption this is call asymmetric cryptography. A good example of this is PGP (pretty good privacy). PGP is used to secure email. It accomplishes this by generating a pair of keys for each user. After the keys have been generated each user shares one key their public key and keeps their privet key secret. When someone wants to email a person who is using PGP they encrypt their message with the recipient's public key. This ensures that the message cannot be snooped on during transit and that only the person who has the corresponding privet key can decrypt the message.
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How do you decrypt a data file to that has been encrypted with the users public key?
When you reference a "public key" you are implying that the file has been encrypted using "asymmetric cryptography". In asymmetric cryptography, encryption and decryption depend on a key PAIR. The user retains their private key and publishes their public key. Anyone can encrypt a file using the user's public key and send it to them. The only person who should be able to decrypt a file encrypted with that public key is the holder of the private key - which, unless the user has made the mistake of sharing their private key - means that only the original user can decrypt the messages sent to them. Most of the asymmetric encryption algorithms use pretty much the same method to decrypt that was used to encrypt, but use the "other" key from the key pair. Messages encrypted using the private key can only be decrypted using the public key - which provides some authentication that the message indeed came from the holder of the private key. Messages encrypted using the public key can only be decrypted by the holder of the private key, so messages sent to them should be secure.
Where can you decrypt Public Key Cryptography?
Public key cryptography always works the same way: Encryption is done with the public key, decryption done with the private key. It is not possible to decrypt anything with the public key (otherwise the whole system would crash down). The only time it's done the other way is for message authentication, where only a digest of a message is encrypted and can be verified (not decrypted) using the public key.
Can you explain how to decrypt a message using a public key?
To decrypt a message using a public key, the recipient must have the corresponding private key. The sender encrypts the message using the recipient's public key, which can only be decrypted with the recipient's private key. This ensures that only the intended recipient can read the message.
How does public key decryption work in ensuring secure communication over the internet?
Public key decryption works by using a pair of keys - a public key and a private key. The public key is used to encrypt data, which can only be decrypted by the corresponding private key. This ensures secure communication over the internet because only the intended recipient, who possesses the private key, can decrypt the data. This method helps prevent unauthorized access to sensitive information during transmission.
How does asymmetric encryption provide confidentiality?
Asymmetric encryption can provide confidentiality in two ways:1) messages encrypted using the public key of the recipient can only be decrypted using the private key of the recipient - which only the recipient should possess.2) It can be used as part of a negotiation process between two users to establish a temporary shared key through a process such as the following:User A sends a challenge message to user B which is encrypted with user B's public key to initiate secure communications.User B decrypts the message and sends the correct response back to user A encrypted with user A's public keyThe two users are now authenticated to each otherAt this point A can send a proposed symmetric key to B encrypted with B's private keyAll further communications are encrypted via the shared symmetric keyIn this second scenario, the asymmetric encryption only facilitates the establishment of confidentiality via the eventually shared symmetric key by securing the initial negotiations.
Utilizing Public Key Encryption How would John and Jim send an encrypted message between parties?
John would use Jim's public key to encrypt and Jim would use his private key to decrypt.Public Key Cryptography (Asymmetric encryption)An algorithm where data encrypted with a public key can only be decrypted by the matching private key. Vice versa is true, what is encrypted with a private key can only be decrypted with a public key.
How do you decrypt a data file to that has been encrypted with the users public key?
When you reference a "public key" you are implying that the file has been encrypted using "asymmetric cryptography". In asymmetric cryptography, encryption and decryption depend on a key PAIR. The user retains their private key and publishes their public key. Anyone can encrypt a file using the user's public key and send it to them. The only person who should be able to decrypt a file encrypted with that public key is the holder of the private key - which, unless the user has made the mistake of sharing their private key - means that only the original user can decrypt the messages sent to them. Most of the asymmetric encryption algorithms use pretty much the same method to decrypt that was used to encrypt, but use the "other" key from the key pair. Messages encrypted using the private key can only be decrypted using the public key - which provides some authentication that the message indeed came from the holder of the private key. Messages encrypted using the public key can only be decrypted by the holder of the private key, so messages sent to them should be secure.
What is a characteristic of public key cryptography?
If data is encrypted with the public key, only the private key can decrypt itAnswer Explanation: Public key encryption uses an asymmetric algorithm, which uses a public key and private key combination for the encryption and decryption process. If data is encrypted with the public key, only the private key can decrypt the data. The public key cannot decrypt a message that was encrypted with the public key. Alternatively, if data is encrypted with the private key, only the public key can decrypt the data.
What are characteristics of public key cryptography?
If data is encrypted with public key, only private key can decrypt it. AGN
How many keys are utilized in asymmetric encryption?
Asymmetric encryption uses at least 2 keys - hence the asymmetry. The keys for encryption and decryption are not the same, so they are not "symmetric". Usually only 2 keys are used - a public key and a private key. The public key is published to a key registry or sent separately to those the key-pair owner wants to communicate with. The private key is retained by the owner. Messages encrypted with the private key can only be decrypted using the public key. If the source of the public key is trusted, this provides some proof of the source of the message. Messages encrypted with the public key can only be decrypted using the private key - so only the owner of the private key should be able to decrypt messages encrypted with their own private key.
Where can you decrypt Public Key Cryptography?
Public key cryptography always works the same way: Encryption is done with the public key, decryption done with the private key. It is not possible to decrypt anything with the public key (otherwise the whole system would crash down). The only time it's done the other way is for message authentication, where only a digest of a message is encrypted and can be verified (not decrypted) using the public key.
What are the roles of Public and Private Key?
A user's private key is kept private and known only to the user. The user's public key is made available to others to use. The private key can be used to encrypt a signature that can be verified by anyone with the public key. Or the public key can be used to encrypt information that can only be decrypted by the possessor of the private key
True or false asymmetric encryption the keys are mathematically related to one another?
True. In asymmetric encryption, there are two keys: a public key and a private key, which are mathematically related. This relationship allows data encrypted with the public key to be decrypted only with the corresponding private key, ensuring secure communication. However, while they are related, it is computationally infeasible to derive one key from the other.
What is The essential ingredients of asymmetric cipher?
Symmetric ciphers use only one key. By contrast, an asymmetric cipher will use two keys. One key is kept "private" by the the owner while the other is "published" or otherwise released to the public (hence known as the "public key"). Data encrypted by one key can only be decrypted using the other key.
Is there a need of physical security while using cryptography?
Yes. Decrypted or plain text - yet to be encrypted - messages need to be kept securely before they are encrypted and transmitted.
Can you explain how to decrypt a message using a public key?
To decrypt a message using a public key, the recipient must have the corresponding private key. The sender encrypts the message using the recipient's public key, which can only be decrypted with the recipient's private key. This ensures that only the intended recipient can read the message.
Is asymmetric encryption the keys are mathematically related to one another?
In asymmetric encryption, the keys are not mathematically related in a straightforward way; rather, they are generated as a pair consisting of a public key and a private key. The public key can be shared openly and is used for encryption, while the private key, which must be kept secret, is used for decryption. The relationship between the two keys is such that data encrypted with the public key can only be decrypted with the corresponding private key, ensuring security. However, the exact mathematical relationship is complex and relies on certain mathematical problems that are difficult to solve without the private key.
