ENCRYPTION TRB CSI › Cyber Security › encryption

ENCRYPTION

Encryption is the process of converting plaintext into ciphertext using an algorithm and a key to protect data from unauthorized access. தமிழில்: Original readable message அல்லது data-ஐ ஒரு Encryption Algorithm + Key பயன்படுத்தி secret/unr…

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ENCRYPTION Encryption என்பது readable data-ஐ unauthorized person புரிந்து ……

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Definition

Encryption is the process of converting plaintext into ciphertext using an algorithm and a key to protect dat……

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Simple Explanation

நம்மிடம் ஒரு message இருக்கிறது: HELLO இது normal readable message. இதனை encryption செய்த……

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Explanation
Basic terms

Encryption புரிந்து கொள்ள 5 முக்கிய terms த……

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Explanation

1. PLAINTEXT…

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Definition

Encryption செய்வதற்கு முன் இருக்கு……

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Explanation
Example

HELLO WORLD இது plaintext.…

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List

1. CIPHERTEXT…

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Definition

Plaintext encryption செய்யப்பட்ட பிறகு கி……

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Explanation
Example

KHOOR ZRUOG இதுதான் ciphertex……

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List

1. ENCRYPTION…

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Explanation

Plaintext-ஐ ciphertext-ஆக மாற……

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List

1. DECRYPTION…

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Explanation

Ciphertext-ஐ மீண்டும் original plai……

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List

1. KEY…

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Definition

Encryption மற்றும் decryption process-ஐ control செய்யும் secret அல்லது cryptographic value தான் Key……

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Flow
Complete flow

Sender ↓ Plaintext ↓ Encryption Algorithm + Encryption Key ……

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Real Life Example
Example

Original message: DATA Encryption process: DATA ↓ Encryp……

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Explanation
Why encryption is needed

Encryption முக்கியமாக data-ன் Confidentiality protect செய்கிறது. Encryption இல்லாமல் network-ல் dat……

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Real Life Example
Example

Without encryption: Username = Raja Password = abc123 Attacker network traffic captu……

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Explanation
Main purposes of encryption

Encryption பயன்படுத்துவதன் முக்கிய நோக்கங்கள்: Data confidentiality Privacy protect……

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Explanation
Types of encryption

Encryption-ன் இரண்டு major ty……

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Explanation

1. SYMMETRIC ENCRYPTION…

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Definition

Encryption மற்றும் decryption இரண்டிற்கும் same key ப……

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Flow

Plaintext ↓ Same Secret Key ↓ Encrypt……

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Real Life Example
Example

Sender-க்கும் receiver-க்கும் same key: Key = 369 Sender:……

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Important

Symmetric encryption-ல்: Encr……

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Explanation
Advantages

Fast Efficient Large amount of d……

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Explanation
Disadvantage

Main problem: Key Distribution Problem Sender மற்றும் receiver s……

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Explanation
Symmetric algorithms

Examples: AES DES 3DES Blowfis……

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Explanation

1. ASYMMETRIC ENCRYPTION…

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Definition

Asymmetric encryption-ல் இரண்டு different keys பயன்படுத்……

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Explanation
Keys

Public Key Public-ஆக share செய்யலாம்.……

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Flow
Basic flow

ஒரு common confidentiality model: Sender ↓ Receiver's P……

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Important

Confidentiality use-case-ல்: Encrypt w……

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Real Life Example
Example

Ravi-க்கு இரண்டு keys இருக்கிறது: Ravi Public Key Ravi Private Key Kumar Ravi-க்கு sec……

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Explanation
Asymmetric algorithms

Examples: RSA ECC ElGamal…

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Explanation
Advantages

Secret key directly share செய்ய வேண்டிய pr……

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Explanation
Limitation

Symmetric encryption-ஐ compare செய்தால் generally computationally slower……

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Memory Trick

Symmetric S = Same Key Asymmetric A = Alterna……

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Formula
Encryption formula

General encryption: C = E(K, P) Where: C = Ciphertext E = Encryption algorit……

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Explanation
Cryptography

Encryption என்பது Cryptography-ன் ஒரு முக்கிய part. Cryptography Information-ஐ mathematical tec……

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Explanation

[ENCRYPTION vs HASHING] இது exam-க்கு மிகவும் முக்கியம். Encryption Reversible. Correct key இருந்தால் origina……

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Common Mistake

Wrong Hashing and Encryption are the sa……

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Explanation
Encryption at rest

Stored data encrypt செய்வது. Examples: Hard disk Database USB drive Bac……

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Explanation
Encryption in transit

Network வழியாக travel செய்யும் data-ஐ protect செய்வது. Examples: Web communication Onlin……

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Definition

Message sender device-ல் encrypt செய்யப்பட்டு intended receiver device-ல் மட்டுமே decrypt ஆகும் communication……

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Explanation
Key management

Encryption strong இருந்தாலும் key பாதுகாப்பாக இல்லையெனில் security fail ஆகல……

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Important

Strong Encryption + Poor Key ……

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Explanation
Key length

Key length அதிகமானால் possible key combinations அதிகரிக்கும். Example……

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Explanation
Des

DES = Data Encryption Standard Symmetric encryption algorithm Block cipher……

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Explanation
Aes

AES = Advanced Encryption Standard Modern sym……

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Important

AES: Symmetric Block cipher W……

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Explanation
Rsa

RSA ஒரு asymmetric cryptographic algorithm. இதில்: Publ……

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Explanation
Block cipher

Data-ஐ fixed-size blocks-ஆக p……

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Concept

Large Message ↓ Block 1 Block……

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Explanation
Stream cipher

Data-ஐ stream-ஆக, பொதுவாக bits/bytes தொடர்ச்சியாக encrypt செய்யும……

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Explanation
Confidentiality

Encryption-ன் primary security objective: Confidentiality CIA Triad: C → Confidentiality I → Integrity A → Av……

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Real Life Example
Real-life applications

Encryption பயன்படுத்தப்படும் இடங்கள்: Online Banking Transaction information protect செய்ய. HTTPS Websites Br……

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Explanation
Https and encryption

HTTPS = Hypertext Transfer Protocol Secure Browser மற்றும் website server இடையிலான communication-ஐ cryptograp……

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Explanation
Attacker view

Without encryption: Sender ↓ Password = abc123 ↓ Attacker reads it ↓ Receiver With encryption: Sender ↓ Encry……

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Common Mistake
Common error

Wrong Encryption prevents all cyber attacks. Correct Encryption ஒரு security control மட்டும். Encryption……

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Common Mistake
Another common error

Wrong Public key must always be secret. Correct Publ……

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Memory Trick

Encryption flow: P E C D P P - Plaintext E - ……

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TRB Point

TRB / NET / SET examination-க்கு முக்கியமான facts: Plaintext Original readable message. Ciphertext Encrypted ……

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Interview Point
Question

What is encryption? Answer Encryption is the process of converting readable p……

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Interview Point
Interview question

What is the difference between symmetric and asymmetric encryption? Symmetric enc……

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MCQ

Encryption converts:…

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MCQ

Decryption converts:…

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MCQ

Original readable data is kno……

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MCQ

Encrypted unreadable data is ……

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MCQ

Symmetric encryption uses:…

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MCQ

Asymmetric encryption uses:…

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MCQ

Which is a symmetric encrypti……

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MCQ

Which is an asymmetric algori……

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MCQ

Encryption primarily provides:…

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MCQ

AES supports which key sizes?…

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MCQ

DES is a:…

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MCQ

Public key cryptography is an……

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Practice

Define Encryption. Define Plaintext. Define Ciphertext. Explain Encryption and Decryption. What is a cryptogr……

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Summary

ENCRYPTION | Plaintext → Ciphertext | +------------+------------+ | | Symmetric Asymmetric | ……

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Explanation
Short description

Encryption is a cryptographic process that converts readable plaintext into unreadable ciphertext using an al……

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