DIGITAL SIGNATURES Digital Signature என்பது ஒரு electronic document, message அல்லது file: யாரால் அ……
DIGITAL SIGNATURES
A digital signature is a cryptographic technique used to verify the authenticity and integrity of a digital message, document, or transaction and to support non-repudiation. தமிழில்: ஒரு digital document அல்லது message-க்கு sender-ன் Priva…
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Definition
A digital signature is a cryptographic technique used to verify the authenticity and integrity of a digital m……
Simple Explanation
Physical document-ல்: Document ↓ Handwritten Signature ↓ Person identity indication Digital world-ல்: Digital……
Explanation
Main purpose
Digital Signature முக்கியமாக மூன்று security properties வழங்குகிறது: ……
Explanation
1. AUTHENTICATION…
Explanation
Message யாரிடமிருந்து வந்தது என்பதை verify செய்ய உதவுகிறது. Sender: Ravi ↓ Ravi's Private K……
List
1. INTEGRITY…
Explanation
Message sender sign செய்த பிறகு மாற்றப்பட்டதா என்பதை detect செய்ய உதவுகிறது. Original: Tr……
List
1. NON-REPUDIATION…
Definition
ஒரு sender தனது private key மூலம் valid digital signature உருவாக்கியிருந்தால், பின்னர் அந்த signed transactio……
Important
Important terms
Digital Signature புரிய இந்த terms முக்கியம்: Message Hash……
Explanation
Hash function
Digital signature முழு document-ஐ நேரடியாக process செய்வதற்குப் பதிலாக பொதுவ……
Explanation
Message digest
Hash function output: Message Digest / Hash Value Example conc……
Explanation
Digital signature generation
Sender side process: Original Message ↓ Hash Function ↓ Message Digest……
Explanation
Step-by-step generation
Step 1: Create Message Sender ஒரு document உருவாக்குகிறார். P……
Explanation
Sender தனது: Private Key பயன்படுத்தி message digest-க்கு digital signature உருவாக்க……
Explanation
Digital signature verification
Receiver side: Received Message ↓ Hash Function ↓ Hash Value 1 Digital signature: Digital Signature ↓ Sender ……
Flow
Complete flow
SENDER SIDE Message ↓ Hash Function ↓ Message Digest ↓ Sender Private Key ↓ Digital Signature Message + Signa……
Important
Very important
Digital Signature uses: Sender's Private Key for Signin……
Real Life Example
Example
Suppose Ravi sends a document to Kumar. Ravi Ravi has: Ravi Public Key Ravi Private Key Ravi creates: Documen……
Explanation
Key usage
This is a very important distinction. Confidentiality with Public-Key Encryption Rece……
Memory Trick
Encryption Receiver's keys Receiver Public → Encrypt Receiver Private → Decrypt Digital Signature Sender's ke……
Remember
Digital Signature is a cryptographic form of electron……
Explanation
Digital certificate
Digital Signature systems-ல் ஒரு முக்கியமான concept: Digital Certificate Di……
Explanation
Certificate contains
பொதுவாக: Subject name Public key Issuer Validity ……
Explanation
Certificate authority
CA = Certificate Authority Digital ……
Concept
Certificate Authority ↓ Issue……
Explanation
Pki
PKI = Public Key Infrastructure Public-key cryptography மற்றும் digital certificates-ஐ manage செய்ய……
Explanation
Digital signature algorithms
Common digital signature algo……
Explanation
Rsa
RSA public-key cryptography-ல் encryption மட்டுமல்லாமல் digital signatures-க்கும் பயன்படுத்தப்படல……
Explanation
Dsa
DSA = Digital Signature Algorithm Digital signatures உருவாக்குவதற்காக……
Explanation
Ecdsa
ECDSA = Elliptic Curve Digital Signature Algori……
Explanation
Eddsa
EdDSA = Edwards-curve Digital S……
Explanation
Hash + digital signature
Digital signature-ல் hashing ஏன்? ஒரு 500-page document-ஐ direct-ஆக signature algorithm process செய்வதைவி……
Real Life Example
Example of data modification
Original message: PAY ₹1000 Hash: ABC123... Signature உருவாக்கப்பட்ட……
Output
Result
Explanation
What digital signature does not do
Digital signature: Message content-ஐ automatically secret ஆக்காது Confidentiality தனியாக gua……
Explanation
Signed + encrypted communication
Security system இரண்டையும் combine செய்யலாம்: Message ↓ Digital Signature ↓ Encryption ↓ Secur……
Explanation
[AUTHENTICATION vs DIGITAL SIGNATURE] Authentication login context-ல் user identity verify செய……
Explanation
Digital signature applications
Digital signatures பயன்படுத்த……
Explanation
1. E-Governance…
Explanation
Digital documents authenticat……
Explanation
1. Online Contracts…
Explanation
Electronic agreements sign செ……
Explanation
1. Software Distribution…
Explanation
Software authentic source-இலி……
Explanation
1. Code Signing…
Explanation
Applications/software publish……
Explanation
1. Secure Email…
Explanation
Email authenticity/integrity ……
Explanation
1. Banking and Financial Tran……
Explanation
Electronic transactions valid……
Explanation
1. Digital Certificates…
Explanation
Certificate authentication.…
Explanation
1. PDF / Document Signing…
Explanation
Official electronic documents sign செய்ய. Software publisher தனது software-ஐ digital signature……
Explanation
Digital signature security
Digital signature security-க்கு: Private key secret இருக்க வேண்டும் Strong hash function பயன்பட……
Explanation
Private key compromise
Digital signature-ல் மிக முக்கியமான security issue: Private Key Compromise Attacker s……
Common Mistake
Common error
Wrong Digital signature என்பது scanned handwritten signature. Corre……
Common Mistake
Common error
Wrong Digital Signature provides confidentiality. Correct Digital Signature……
Common Mistake
Common error
Wrong Public key is used to create the digita……
Memory Trick
Digital Signature: P S P V P - Private Key……
Memory Trick
Another memory trick
Digital Signature properties: AIN……
TRB Point
TRB / NET / SET examination-க்கு மிகவும் முக்கியமான points: Digital Signature Cryptographic mechanism. Signin……
Interview Point
Question
What is a digital signature? Answer A digital signature is a cryptographic mechanism in which a signer u……
Interview Point
Interview question
What are the three major properties provided ……
Interview Point
Interview question
Which key is used for signing and verifi……
MCQ
Digital signature primarily p……
MCQ
Which key is used to create a……
MCQ
Which key is used to verify a……
MCQ
Digital signature helps provi……
MCQ
Which technique is generally ……
MCQ
A hash function produces:…
MCQ
Which of the following is a d……
MCQ
DSA stands for:…
MCQ
CA stands for:…
MCQ
PKI stands for:…
MCQ
Which property detects modifi……
MCQ
Digital signatures primarily ……
MCQ
If a signed message is modifi……
MCQ
Which key must remain secret?…
MCQ
A digital certificate commonl……
Practice
Define Digital Signature. Explain Digital Signature generation. Explain Digital Signature verification. What ……
Summary
DIGITAL SIGNATURE Sender Side…
Message ↓ Hash Function ↓ Message Digest ↓ Sender Private Key ↓ Digital Signature Receiver Side Received Mess……
Explanation
Short description
A digital signature is a cryptographic mechanism that uses a private key for signing and the corresponding pu……
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