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

Question

BlackTom AI · Accepted Answer

Here's how the signing process is understood in public key cryptography when signing a transaction (Tx).
Option 1: Perform proof of work on Tx. This is unrelated to digital signatures; PoW is a consensus mechanism, not a signing operation, so it does not produce a verifiable signature.
Option 2: Hash Tx. Hashing the transaction is a preparatory step, but on its own it does not provide authentication or non-repudiation—there is no way to prove authorship without using a private key to sign the hash.
Option 3: Encrypt Tx with a public key. Encrypting with a public key would hide the contents from others, but it is not a signature method and cannot be reliably verified to prove who created the Tx.
Option 4: Hash Tx and encrypt the hash with a private key. This combines the idea of hashing (creating a fixed, representative digest) with signing (encrypting the digest with the signer’s private key). This is exactly how a digital signature is produced: the signature is a private-key operation on the hash of the message, allowing others with the public key to verify.
Option 5: Hash Tx and encrypt the hash with a public key. Encrypting with a public key would not allow others to verify the signer’s identity; since the public key is public, anyone could perform that operation, defeating the purpose of authentication. In standard practice, encryption for confidentiality uses the recipient’s public key, not the signer’s public key, and signing uses the signer’s private key.
In summary, the only choice that aligns with the canonical signing workflow in public-key cryptography—hashing the content and then signing (encrypting) the hash with the private key—is Option 4.

46912 Blockchain - Final Exam

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

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?

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

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.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单

46912 Blockchain - Final Exam

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

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?

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

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.

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单

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.