STEGANOGRAPHY Steganography என்பது ஒரு secret message அல்லது data-ஐ வேறு ஒரு norma……
STEGANOGRAPHY
Steganography is the technique of hiding secret information inside another ordinary-looking medium such as an image, audio file, video, or text so that the existence of the hidden information is concealed. தமிழில்: ஒரு message-ஐ direct-ஆக …
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Definition
Steganography is the technique of hiding secret information inside another ordinary-looking medium such as an……
Simple Explanation
Suppose secret message: MEET AT 5 PM இந்த message-ஐ directly அனுப்பினால் மற்றவர்களுக்கு message இருப்பது தெரி……
Explanation
Word meaning
Steganography என்ற word Greek origin. Steganos……
Explanation
Main objective
Steganography-ன் primary objective: Concealment of th……
Explanation
Basic steganography model
Secret Message + Cover Object ↓ Embedding Algorithm ……
Important
Important terms
Steganography-ல் முக்கியமான terms: Cover Object S……
Important
1. COVER OBJECT…
Definition
Secret information மறைக்க பயன்படுத்தப்……
Explanation
Example
flower.jpg இந்த image-ல் secret……
List
1. SECRET MESSAGE…
Explanation
மறைக்க வேண்டிய actual confide……
Program
Example
Explanation
இதுதான் secret message.…
List
1. STEGO KEY…
Explanation
Optional secret key பயன்படுத்தி embedding/extraction control செய்யலாம். ……
List
1. EMBEDDING…
Explanation
Secret message-ஐ cover object-ன் உள……
List
1. STEGO OBJECT…
Explanation
Secret data embed செய்யப்பட்ட final file. Original: flow……
List
1. EXTRACTION…
Explanation
Stego object-இலிருந்து hidden message……
Flow
Complete flow
SENDER SIDE Cover Image + Secret Message + Stego Key ↓ Embedding Algorith……
Explanation
Types of steganography
Major types: Image Steganography Audio Steganography Vi……
Explanation
1. IMAGE STEGANOGRAPHY…
Definition
Secret information-ஐ digital image-ன் pixel data-ல் மறைப்பது. Images commonly used ……
Explanation
Image representation
Digital image pixels மூலம் உர……
Program
Example
Explanation
இந்த binary values-ல் சிறிய c……
Explanation
Lsb steganography
LSB = Least Significant Bit Image stegano……
Explanation
What is lsb?
Binary number: 10110110 Right-mos……
Explanation
Why lsb?
LSB-ஐ மாற்றினால் numeric value மிகச……
Comparison
Difference
1 Image pixel value-ல் 1 difference human eye-க்கு பெ……
Real Life Example
Lsb example
Suppose secret bit: 1 Pixel value: 10110110 Current LS……
Explanation
Multiple pixels
Secret data: 1 0 1 Original pixel bytes: 10110110 11001001 01101100 LSBs: 0 1 0 R……
Important
LSB steganography: Secret data is hidden in the ……
Important
1. AUDIO STEGANOGRAPHY…
Definition
Secret message-ஐ audio signal அல்லது……
Explanation
Methods
Audio steganography techniques includ……
Flow
Simple flow
Audio File + Secret Message ↓ Embedding ↓ St……
Flow
1. VIDEO STEGANOGRAPHY…
Definition
Secret data-ஐ video-ன்: Frames Pixels……
Simple Explanation
Video என்பது: Frames + Audio எனவே vid……
Flow
Video + Secret Data ↓ Embeddi……
Flow
1. TEXT STEGANOGRAPHY…
Definition
Text formatting அல்லது linguistic patterns பயன்படுத்தி secret informati……
Real Life Example
Simple example
Sentence: Secret Agents Never Disclose First letters: S A N D இ……
Real Life Example
1. NETWORK STEGANOGRAPHY…
Definition
Network protocols அல்லது packets-ல் unused/optional fields, timing patterns போன்றவற்றை பயன்படுத்தி hidden……
Definition
1. DOCUMENT / FILE STEGANOGRA……
Definition
Documents அல்லது other digital files-ன் metadata, formatting, interna……
Explanation
Spatial domain steganography
Image pixels-ஐ directly modify செய்வது. LSB T……
Explanation
Transform domain steganography
Image pixel values-ஐ direct-ஆக modify செய்யாமல் tran……
Explanation
Dct
DCT = Discrete Cosine Transform JPEG compression-ல் DCT மிகவும் முக்கியமான c……
Explanation
Why dct?
Transform domain embedding: Compression-க்கு better resistance இருக்……
Explanation
Dwt
DWT = Discrete Wavelet Transform Image-ஐ differ……
Explanation
Dwt basic view
Original Image ↓ DWT ↓…
| LL | LH | | HL | HH | LL Low-frequency approximation information. LH, HL……
[STEGANOGRAPHY vs CRYPTOGRAPHY] இது மிக முக்கியமான exam comparison. Cryptography Message-ஐ unreadable form-ஆக……
Memory Trick
Cryptography Hide the meaning Steganograph……
Explanation
Steganography + encryption
இரண்டையும் combine செய்தால் stronger secrecy கிடைக்கலாம். First: Secret Message ↓ Encryption ↓……
Explanation
Advantages
Steganography advantages: Secret communication existence hide செய்யலாம். Image/audio/vide……
Explanation
Limitations
Steganography limitations: File compression hidden data destroy செய்யலாம். Image editing hidden information a……
Definition
Stego object: Compression Cropping Scaling Noise Format conversio……
Explanation
Capacity
Cover object எவ்வளவு secret data h……
Explanation
Imperceptibility
Hidden data embed செய்த பிறகும் cover file vi……
Important
Three important steganography properties
ஒரு steganographic system-ல் பொதுவாக ……
Explanation
Memory
C I R C - Capacity I - Imperc……
Explanation
Capacity explanation
High capacity: அதிக secret data hide செய்ய மு……
Explanation
Imperceptibility explanation
Changes human senses-க்கு noticeable ஆகக்கூடாது. Image: V……
Explanation
Robustness explanation
Stego file processing நடந்தாலும் hidden data surv……
Definition
Steganography மூலம் hidden information இருக்கிறதா என்பதை detect அல்லது analyze செய்……
Explanation
Digital watermarking
Steganography-க்கு related co……
Definition
Image/audio/video-ல் ownership அல்லது identification information embed செய்வது ……
Definition
[VISIBLE vs INVISIBLE WATERMAR……
Explanation
Example
© Kalviyogi image மேலே visible. Invisible Wat……
Explanation
Steganography applications
Steganography legitimate applications: Confidential communication Digital watermark……
Explanation
Steganography in image
Complete conceptual flow: Original Image | | Secret Message | | ……
Explanation
Rgb image explanation
Color image ஒரு pixel பொதுவாக: R = Red……
Program
Example
Explanation
Total: 8 + 8 + 8 = 24 bits So……
Explanation
Lsb in rgb
One pixel: R = 10101100 G = 11100101 B = 00110110 LSB positions: R = 1010110[0]……
Important
One RGB pixel-ன் three channels-ன் LSB பயன்படுத்தினால் theoretically small number of ……
Common Mistake
Common error
Wrong Steganography மற்றும் Encryption same. Correct Encr……
Common Mistake
Common error
Wrong Steganography only images-ல் use செய்யப்படு……
Common Mistake
Common error
Wrong LSB means Last Signific……
Common Mistake
Common error
Wrong Stego image என்றால் encrypted image. Correct Stego im……
Memory Trick
Main concepts: C + S = S Cover Object + Secret Me……
Memory Trick
Another memory trick
LSB Least Significant Bit…
Remember
Right-most bit…
Explanation
Example
11010101 ↑ LSB…
TRB Point
TRB / NET / SET examination-க்கு மிகவும் முக்கியமான points: Steganography Hides the existence of information ……
Interview Point
Question
What is steganography? Answer Steganography is the technique of hiding secret information ins……
Interview Point
Interview question
What is the difference between cryptography and steganography? Cryptogra……
Interview Point
Interview question
What is LSB steganography? LSB steganography hides secret data by m……
MCQ
Steganography is used to:…
MCQ
The original carrier file is ……
MCQ
The output after secret data ……
MCQ
LSB stands for:…
MCQ
Which is commonly used in sim……
MCQ
DCT stands for:…
MCQ
DWT stands for:…
MCQ
Which technique attempts to d……
MCQ
Cryptography primarily hides:…
MCQ
Steganography primarily hides:…
MCQ
Which is a transform-domain m……
MCQ
Which is related to copyright……
MCQ
LSB method belongs mainly to:…
MCQ
Hidden-data carrying final im……
MCQ
Which three factors are impor……
Practice
Define Steganography. Explain Cover Object. What is a Stego Object? Explain the basic Steganography process. ……
Summary
STEGANOGRAPHY | Hide Secret Information | ------------------------- | | | | Image Audio Video Text | --------……
Explanation
Short description
Steganography is the technique of concealing secret information inside an ordinary-looking cover medium such ……
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