Question at position 26 What is the main purpose of a Digital Signature in cryptography?To verify the authenticity and integrity of a messageTo encrypt a message so only the intended recipient can read itTo generate a one-time pad for secure communicationTo prevent brute-force attacks on passwordsClear my selection

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BlackTom AI · Accepted Answer

Let’s begin by clearly restating the scenario: we’re evaluating the main purpose of a Digital Signature in cryptography, with four options to choose from.
Option 1: "To verify the authenticity and integrity of a message". This aligns with the core function of digital signatures: they enable the recipient to confirm who sent the message (authenticity) and that the message has not been altered in transit (integrity). This is achieved using a private key to sign and a corresponding public key to verify, often alongside a hash of the message.
Option 2: "To encrypt a message so only the intended recipient can read it". Encryption for confidentiality is usually achieved via encryption algorithms using the recipient’s public key (or shared symmetric keys), not by signatures. While signatures may be part of a broader public-key infrastructure, the signature itself does not provide confidentiality by encrypting the message contents for reading by the recipient.
Option 3: "To generate a one-time pad for secure communication". One-time pads are a theoretical perfect secret method requiring a truly random key as long as the message, used in a special class of ciphers. Digital signatures do not generate one-time pads; they rely on asymmetric keys and hashing, not one-time pad material.
Option 4: "To prevent brute-force attacks on passwords". Digital signatures are not designed to impede brute-force attempts on passwords. Password security typically involves hashing, salting, rate limiting, and policies, whereas signatures are about authentication and message integrity, not password protection mechanisms.
Now, analyzing the underlying concept more broadly: digital signatures leverage public/private key cryptography to provide non-repudiation, authenticity, and integrity. They do not primarily ensure confidentiality (that’s encryption), nor do they generate random one-time pads, nor do they address brute-force password resistance directly. The most accurate description among the options is Option 1, because it captures both authenticity and integrity, which are the essential purposes of digital signatures in cryptography.
To summarize the incorrect choices: the second option confuses signatures with encryption for confidentiality, the third option introduces a separate cryptographic primitive not associated with signatures, and the fourth option targets password security rather than message authentication and integrity. The correct choice, option 1, therefore best reflects the intended function of a digital signature in typical cryptographic practice.

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