Digital signatures

Which of the following is a requirement for a digital signature?

Compression of the message
Authentication of the author of the message (correct)
Decryption of the message
Encryption of the message

What is the purpose of non-repudiation in digital signatures?

To confirm the time of the message
To protect against forgery
To prevent the signer from denying they signed (correct)
To encrypt the message

What is the role of a hash function in digital signatures?

To confirm the time of the message
To encrypt the message
To produce a fixed-length message digest (correct)
To compress the message

Why was the first idea of signing a message not used in practice?

The signature was too long (A) Signup and view all the answers

What is the advantage of using a hash function in digital signatures?

The signature is shorter than the message (C) Signup and view all the answers

What is the disadvantage of using a poorly designed hash function in digital signatures?

The signature is vulnerable to attacks (A) Signup and view all the answers

What is the purpose of the eIDAS EU regulation?

To establish the use of digital signatures as legal signatures (A) Signup and view all the answers

Which of the following is a requirement for a digital signature?

Authentication of the author of the message (D) Signup and view all the answers

What is non-repudiation in the context of digital signatures?

The ability to deny signing a message (C) Signup and view all the answers

What is the purpose of a hash function in digital signatures?

To produce a fixed-length message digest (A) Signup and view all the answers

What is the disadvantage of the first idea of signing a message using public key cryptography?

The signature is too long (D) Signup and view all the answers

How is a message digest computed in the RSA signature scheme?

By applying a public hash function to the message (B) Signup and view all the answers

What is the advantage of using a hash function in the RSA signature scheme?

The signature is shorter than the message (C) Signup and view all the answers

What is the disadvantage of using a poorly designed hash function in the RSA signature scheme?

The signature is prone to attacks (C) Signup and view all the answers

What is an example of a digital signature service?

DocuSign (B) Signup and view all the answers

What is the purpose of a timestamp in a digital signature?

To confirm the time of the message (D) Signup and view all the answers

What is the purpose of a public key in a digital signature scheme?

To verify the signature (A) Signup and view all the answers

What is the purpose of a private key in a digital signature scheme?

To sign the message (A) Signup and view all the answers

What is the difference between a digital signature and an electronic signature?

A digital signature relies on cryptographic mechanisms, while an electronic signature relies on a signing process (C) Signup and view all the answers

What are the three requirements for a digital signature?

Authentication of the author, non-repudiation, and integrity. Signup and view all the answers

What is the disadvantage of the first idea of signing a message using public key cryptography?

The signature is as long as the message and vulnerable to attacks. Signup and view all the answers

What is the better solution for signing a message using public key cryptography?

Using a hash function to produce a fixed-length message digest. Signup and view all the answers

What is the advantage of using a hash function in digital signatures?

The signature has a small fixed length, regardless of the length of message. Signup and view all the answers

What is the potential disadvantage of using a poorly designed hash function in digital signatures?

It can introduce vulnerabilities to the signature scheme. Signup and view all the answers

What is the purpose of the eIDAS EU regulation?

To legally accept digital signatures as signatures. Signup and view all the answers

What is the example of a digital signature service mentioned in the text?

Adobe Digital signatures and DocuSign. Signup and view all the answers

What is the purpose of a message digest in the RSA signature scheme?

To produce a fixed-length value that can be signed using the private key. Signup and view all the answers

What is the formula used to compute the signature in the RSA signature scheme?

s = h^d mod n Signup and view all the answers

What is the formula used to verify the signature in the RSA signature scheme?

s^e mod n = h Signup and view all the answers

What is the advantage of using a hash function in the RSA signature scheme?

It produces a fixed-length message digest that can be signed using the private key. Signup and view all the answers

What is the potential disadvantage of using a poorly designed hash function in the RSA signature scheme?

It can introduce vulnerabilities to the signature scheme. Signup and view all the answers

What is the main purpose of a digital signature?

To authenticate the author of a message (B) Signup and view all the answers

What is the main disadvantage of the first idea of signing a message using public key cryptography?

The signature is too long (B) Signup and view all the answers

What is the purpose of a hash function in digital signatures?

To compress the message (A) Signup and view all the answers

What is the main advantage of using a hash function in digital signatures?

The signature has a small fixed length (D) Signup and view all the answers

What is the potential vulnerability introduced if the hash function used in a digital signature is not well designed?

The message digest can be easily manipulated (C) Signup and view all the answers

What is the result of computing the signature of Bob for message m in the RSA signature scheme?

7 (B) Signup and view all the answers

What is the purpose of the eIDAS EU regulation?

To regulate the use of electronic signatures (A) Signup and view all the answers

What is the main difference between a digital signature and an electronic signature?

A digital signature relies on cryptographic mechanisms, while an electronic signature relies on a signing process (D) Signup and view all the answers

What is the main purpose of non-repudiation in digital signatures?

To prevent the author from denying that they signed the message (B) Signup and view all the answers

What is the main requirement for a digital signature to protect against forgery?

The signature should be linked to the message (A) Signup and view all the answers

What is the result of encrypting Bob's signature using his public key in the RSA signature scheme?

13 (B) Signup and view all the answers

What is the main disadvantage of using a poorly designed hash function in digital signatures?

The message digest can be easily manipulated (D) Signup and view all the answers

What is the purpose of a digital signature?

To authenticate the author of a message (B) Signup and view all the answers

What is the disadvantage of the first idea of signing a message using public key cryptography?

The signature is too long (D) Signup and view all the answers

What is the disadvantage of using a poorly designed hash function in digital signatures?

The signature is not secure (C) Signup and view all the answers

What is the advantage of using a hash function in digital signatures?

The signature is shorter (A) Signup and view all the answers

What is non-repudiation in the context of digital signatures?

The signer cannot deny that they signed (D) Signup and view all the answers

What is the role of a hash function in digital signatures?

To ensure the integrity of the message (B) Signup and view all the answers

What is the purpose of the eIDAS EU regulation?

To regulate digital signatures (C) Signup and view all the answers

What is an example of a digital signature service?

Adobe Digital Signatures (C) Signup and view all the answers

What is the first idea for signing a message using public key cryptography?

To sign the message with a private key (D) Signup and view all the answers

What is the better solution for signing a message using public key cryptography and a hash function?

To hash the message and sign the digest with a private key (B) Signup and view all the answers

What is the disadvantage of using a poorly designed hash function in the RSA signature scheme?

The signature is not secure (B) Signup and view all the answers

What is the purpose of authentication in digital signatures?

To protect against forgery (D) Signup and view all the answers

What is the length of the signature using the first idea of signing a message with public key cryptography?

The length of the signature is as long as the message. (C) Signup and view all the answers

What is the purpose of a hash function in digital signatures?

To produce a fixed-length message digest. (C) Signup and view all the answers

What is the advantage of using a hash function in digital signatures?

The signature has a small fixed length. (B) Signup and view all the answers

What is the disadvantage of using a poorly designed hash function in digital signatures?

The signature can be easily forged. (C) Signup and view all the answers

What is the purpose of the eIDAS EU regulation?

To regulate the use of digital signatures in the EU. (C) Signup and view all the answers

What is the difference between a digital signature and an electronic signature?

A digital signature relies on cryptographic mechanisms, while an electronic signature relies on the process of signing. (A) Signup and view all the answers

What is the role of non-repudiation in digital signatures?

To ensure that the signer cannot deny that they signed. (A) Signup and view all the answers

What is the role of authentication in digital signatures?

To provide a proof of the identity of the author. (C) Signup and view all the answers

What is the role of integrity in digital signatures?

To prevent any change to the signed message without invalidating the signature. (A) Signup and view all the answers

What is the first idea of signing a message using public key cryptography?

Bob decrypts the message with his private key. (A) Signup and view all the answers

What is the second idea of signing a message using public key cryptography?

Bob applies a public hash function to his message. (A) Signup and view all the answers

What is the formula for computing Bob's signature in the RSA signature scheme?

s = h7 mod 33 (C) Signup and view all the answers

Digital signatures

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Questions and Answers

Which of the following is a requirement for a digital signature?

What is the purpose of non-repudiation in digital signatures?

What is the role of a hash function in digital signatures?

Why was the first idea of signing a message not used in practice?

What is the advantage of using a hash function in digital signatures?

What is the disadvantage of using a poorly designed hash function in digital signatures?

What is the purpose of the eIDAS EU regulation?

Which of the following is a requirement for a digital signature?

What is non-repudiation in the context of digital signatures?

What is the purpose of a hash function in digital signatures?

What is the disadvantage of the first idea of signing a message using public key cryptography?

How is a message digest computed in the RSA signature scheme?

What is the advantage of using a hash function in the RSA signature scheme?

What is the disadvantage of using a poorly designed hash function in the RSA signature scheme?

What is an example of a digital signature service?

What is the purpose of a timestamp in a digital signature?

What is the purpose of a public key in a digital signature scheme?

What is the purpose of a private key in a digital signature scheme?

What is the difference between a digital signature and an electronic signature?

What are the three requirements for a digital signature?

What is the disadvantage of the first idea of signing a message using public key cryptography?

What is the better solution for signing a message using public key cryptography?

What is the advantage of using a hash function in digital signatures?

What is the potential disadvantage of using a poorly designed hash function in digital signatures?

What is the purpose of the eIDAS EU regulation?

What is the example of a digital signature service mentioned in the text?

What is the purpose of a message digest in the RSA signature scheme?

What is the formula used to compute the signature in the RSA signature scheme?

What is the formula used to verify the signature in the RSA signature scheme?

What is the advantage of using a hash function in the RSA signature scheme?

What is the potential disadvantage of using a poorly designed hash function in the RSA signature scheme?

What is the main purpose of a digital signature?

What is the main disadvantage of the first idea of signing a message using public key cryptography?

What is the purpose of a hash function in digital signatures?

What is the main advantage of using a hash function in digital signatures?

What is the potential vulnerability introduced if the hash function used in a digital signature is not well designed?

What is the result of computing the signature of Bob for message m in the RSA signature scheme?

What is the purpose of the eIDAS EU regulation?

What is the main difference between a digital signature and an electronic signature?

What is the main purpose of non-repudiation in digital signatures?

What is the main requirement for a digital signature to protect against forgery?

What is the result of encrypting Bob's signature using his public key in the RSA signature scheme?

What is the main disadvantage of using a poorly designed hash function in digital signatures?

What is the purpose of a digital signature?

What is the disadvantage of the first idea of signing a message using public key cryptography?

What is the disadvantage of using a poorly designed hash function in digital signatures?

What is the advantage of using a hash function in digital signatures?

What is non-repudiation in the context of digital signatures?

What is the role of a hash function in digital signatures?

What is the purpose of the eIDAS EU regulation?

What is an example of a digital signature service?

What is the first idea for signing a message using public key cryptography?

What is the better solution for signing a message using public key cryptography and a hash function?

What is the disadvantage of using a poorly designed hash function in the RSA signature scheme?

What is the purpose of authentication in digital signatures?

What is the length of the signature using the first idea of signing a message with public key cryptography?

What is the purpose of a hash function in digital signatures?

What is the advantage of using a hash function in digital signatures?

What is the disadvantage of using a poorly designed hash function in digital signatures?

What is the purpose of the eIDAS EU regulation?

What is the difference between a digital signature and an electronic signature?

What is the role of non-repudiation in digital signatures?

What is the role of authentication in digital signatures?

What is the role of integrity in digital signatures?

What is the first idea of signing a message using public key cryptography?

What is the second idea of signing a message using public key cryptography?

What is the formula for computing Bob's signature in the RSA signature scheme?

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