In Bitcoin and in Ethereum, when a user sends a transaction the transaction is

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Question restatement: In Bitcoin and in Ethereum, when a user sends a transaction the transaction is

Option A: encrypted with the public key of the transaction receiver. 
This is not how transactions are secured in these networks. Public-key encryption is not used to encrypt the whole transaction for the recipient in standard blockchain transfers; instead, transaction authentication relies on signatures tied to the sender's private key. The recipient does not need to decrypt a transaction with their public key.

Option B: encrypted with the private key of the transaction receiver. 
This is incorrect because private keys must remain secret and are not used to encrypt transactions for others to read. If a transaction were encrypted with the recipient's private key, it would imply exposing the private key itself, which would compromise security. Public-key cryptography uses recipients’ public keys for encryption and their private keys for decryption, not the reverse.

Option C: verified by the receiver by using the private key of the sender. 
Verification of a transaction’s authenticity is not performed by the receiver using the sender’s private key. Private keys are never exposed or used for verification by others; they are used solely by the owner to sign messages. Other participants verify signatures using the sender’s public key, not by requesting or using the private key.

Option D: signed with the private key of the sender. 
This aligns with standard blockchain practice: the sender signs the transaction with their private key, producing a digital signature that others can verify using the sender’s public key. This signature proves ownership and intent without revealing the private key itself.

Option E: signed with the public key of the sender. 
Public keys are used for verification of signatures, not for creating signatures. Signing requires a private key; using a public key to sign would be impossible since public keys are designed to be public, non-secret verification tools, not signing material.

Additional notes: The core security mechanism here is asymmetric cryptography where the sender’s private key creates a signature on the transaction data, and network nodes (and eventually the consensus mechanism) verify that signature with the corresponding public key. This preserves integrity and non-repudiation without exposing private material.

46912 Blockchain - Final Exam

In Bitcoin and in Ethereum, when a user sends a transaction the transaction is

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In cryptography, what is a digital signature used for?

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位置36的问题 On the multisig, multiple users have to X to verify and ultimately execute a transaction to be sent to the blockchain - (Select X):EncryptTransferCommitSign

Which of the following security principles do digital signatures NOT provide? Please select all that apply.

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46912 Blockchain - Final Exam

In Bitcoin and in Ethereum, when a user sends a transaction the transaction is

查看解析

登录即可查看完整答案

类似问题

In cryptography, what is a digital signature used for?

I would like to sign a transactions Tx with public key cryptography. Which one of the following is the correct way to sign Tx?

位置36的问题 On the multisig, multiple users have to X to verify and ultimately execute a transaction to be sent to the blockchain - (Select X):EncryptTransferCommitSign

Which of the following security principles do digital signatures NOT provide? Please select all that apply.

When using a digital signature, the sender encrypts the message with their private key and the recipient decrypts the message with the sender's public key.

When receiving a document that has been digitally signed, you can test to ensure that the document was _________ and the _________ was who you expected it to be sent from.

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When receiving a document that has been digitally signed, you can test to ensure that the document was _ and the _ was who you expected it to be sent from.