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In public key and private key cryptography, host ‘A’ has PuA and PrA, host ‘B’ has PuB and PrB as public and private keys respectively. Now, if ‘A’ wants to send a message to ‘B’ securely, which key will be used by ‘A’ for encryption ?
- a)PuA
- b)PuB
- c)PrA
- d)PrB
Correct answer is option 'B'. Can you explain this answer?
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In public key and private key cryptography, host ‘A’ has P...
If the message is encrypted using PuB, then it can be decrypted using only PrB, which will be known only to ‘B’.
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In public key and private key cryptography, host ‘A’ has P...
Understanding Public Key Cryptography
In public key cryptography, each host has a pair of keys: a public key (Pu) and a private key (Pr). The public key is shared openly, while the private key is kept secret.
Scenario: Host A Sending a Message to Host B
When Host A wants to securely send a message to Host B, it needs to ensure that only Host B can read the message. This is achieved through the use of keys.
Key Points on Key Usage
- **Public Key Encryption**:
- Host A will use Host B's public key (PuB) for encryption.
- The reason is that the public key is designed to encrypt messages that only the corresponding private key (PrB) can decrypt.
- **Private Key Decryption**:
- Once the message is encrypted with PuB, it can only be decrypted by Host B using its private key PrB.
- This ensures confidentiality, as only Host B possesses the private key.
Why Option 'B' is Correct
- **Correct Key for Encryption**:
- Option 'B' (PuB) is the correct answer because it is the public key of Host B that Host A will use to encrypt the message.
- Using Host B's public key ensures that the message is secure and can only be accessed by Host B.
- **Secure Communication**:
- This method allows Host A to send the message securely, knowing that only Host B can read it.
In summary, Host A encrypts the message using Host B's public key (PuB) to ensure secure communication.
In public key cryptography, each host has a pair of keys: a public key (Pu) and a private key (Pr). The public key is shared openly, while the private key is kept secret.
Scenario: Host A Sending a Message to Host B
When Host A wants to securely send a message to Host B, it needs to ensure that only Host B can read the message. This is achieved through the use of keys.
Key Points on Key Usage
- **Public Key Encryption**:
- Host A will use Host B's public key (PuB) for encryption.
- The reason is that the public key is designed to encrypt messages that only the corresponding private key (PrB) can decrypt.
- **Private Key Decryption**:
- Once the message is encrypted with PuB, it can only be decrypted by Host B using its private key PrB.
- This ensures confidentiality, as only Host B possesses the private key.
Why Option 'B' is Correct
- **Correct Key for Encryption**:
- Option 'B' (PuB) is the correct answer because it is the public key of Host B that Host A will use to encrypt the message.
- Using Host B's public key ensures that the message is secure and can only be accessed by Host B.
- **Secure Communication**:
- This method allows Host A to send the message securely, knowing that only Host B can read it.
In summary, Host A encrypts the message using Host B's public key (PuB) to ensure secure communication.
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In public key and private key cryptography, host ‘A’ has PuAand PrA, host ‘B’ has PuBand PrBas public and private keys respectively. Now, if ‘A’ wants to send a message to ‘B’ securely, which key will be used by ‘A’ for encryption ?a)PuAb)PuBc)PrAd)PrBCorrect answer is option 'B'. Can you explain this answer?
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