Lesson 116 : Birthday Theorem & Digital Signature Video Lecture | Ethical Hacking using Kali Linux (in English) - Software Development

Ans. The Birthday Theorem is a principle in cryptography that states that in a random set of numbers, the probability of two numbers being the same increases as the number of elements in the set increases. This principle is often used to analyze the security of hash functions.

Ans. The Birthday Theorem is relevant to digital signatures because it can be used to analyze the security of algorithms used for generating digital signatures. If the birthday paradox occurs, where two different messages produce the same digital signature, it can compromise the integrity and security of the signature.

Ans. A digital signature is a cryptographic technique used to verify the authenticity and integrity of digital documents or messages. It involves using a private key to generate a unique digital signature that can be verified using the corresponding public key. Digital signatures provide assurance that the document or message has not been tampered with and that it originated from the claimed sender.

Ans. A digital signature works by using asymmetric encryption techniques. The sender creates a hash of the document or message using a hashing algorithm. This hash is then encrypted using the sender's private key, creating the digital signature. The recipient can verify the signature by decrypting it using the sender's public key and comparing the resulting hash with a newly calculated hash of the received document or message. If the hashes match, it means the document or message is authentic and has not been tampered with.

Ans. There are several advantages of using digital signatures in IT and software: - Authentication: Digital signatures provide a way to verify the authenticity of a document or message and ensure it comes from the claimed sender. - Integrity: Digital signatures ensure that the document or message has not been tampered with during transmission. - Non-repudiation: Once a digital signature is applied, the sender cannot deny having sent the document or message, providing a strong form of evidence. - Efficiency: Digital signatures eliminate the need for physical signatures and manual verification processes, saving time and resources. - Security: Digital signatures use strong encryption algorithms, making it extremely difficult for unauthorized parties to forge or alter signatures.