Question at position 20 What is the main purpose of a Digital Signature in cryptography?To encrypt a message so only the intended recipient can read itTo generate a one-time pad for secure communicationTo verify the authenticity and integrity of a messageTo prevent brute-force attacks on passwordsClear my selection

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BlackTom AI · Accepted Answer

In this question, we are being asked about the main purpose of a Digital Signature in cryptography, with four possible statements to evaluate.
Option 1: 'To encrypt a message so only the intended recipient can read it' — This describes encryption for confidentiality, typically achieved with public-key or symmetric encryption, not the signature mechanism. Digital signatures do not primarily aim to ensure only the intended recipient can read the message.
Option 2: 'To generate a one-time pad for secure communication' — A one-time pad is a theoretical perfectly secure encryption method that uses a key as long as the message; digital signatures do not involve generating or using one-time pads. This choice confuses signature functionality with a different cryptographic primitive.
Option 3: 'To verify the authenticity and integrity of a message' — This statement aligns with the core role of a digital signature: providing authentication (confirming the sender’s identity) and integrity (detecting any tampering with the message) by signing a hash of the message with a private key and allowing recipients to verify it with the signer’s public key. This captures both key aspects of signatures.
Option 4: 'To prevent brute-force attacks on passwords' — Digital signatures do not directly address password guessing or brute-force resistance; this is typically handled by password hashing, salting, and rate-limiting mechanisms. Consequently, this option misrepresents the scope of digital signatures.
Overall, the option that best describes the main purpose is the one that emphasizes authenticity and integrity verification, rather than confidentiality, one-time pads, or password protection specifics.

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