17206046

17206046

Published on 19 May 2021
  • Facebook
  • Twitter
  • Linkedin
Transcript
00:02
Today , I'll be explaining about Multimedia Compression and Multimedia Security in nowadays digital era
00:02
Greetings, my name is Hakim
00:07
A technique used to save compressed image, audio, and video files.
00:24
To reduce the amount of space needed to store data
00:24
Transmit more data in the same time
00:29
Speeding up the file transfer
00:29
Administrators can spend less money - costless
00:35
Wow, Compression was very useful in certain ways. But what it has to do with Multimedia Security ?
00:41
Multimedia Security
00:43
Multimedia security is a form of content-based protection.
00:45
Based mainly on digital watermarking and cryptography
00:48
Helps producer/designer to secure their work
00:50
So,multimedia compression are used extensively in term of security
00:55
Why need to secure our multimedia files?
01:01
Copyright protection of content
01:01
Encryption and control access
01:06
Safer to transfer multimedia documents across the Internets
01:06
Administrators can spend less money - costless
01:11
There are many ways to secure your multimedia documents One of them is :
01:13
Steganography
01:15
&
01:18
Digital Watermarking
01:25
Steganography
01:25
Steganography is the technique of hiding secret data within an ordinary, non-secret, file or message in order to avoid detection
01:32
In greek words, steganos means covered, while graphia means writing
01:34
Example – storing password or confidential information, to hide or transfer illegal content
01:46
The most common method in Steganography is by embedding information into digital images
01:49
We all know that digital images say, a JPEG image, contains several megabytes of data in the form of pixels. This allows some room for someone to embed steganographic information within the digital file
01:58
How is Stenography used today?
02:02
The hidden file is encoded in the least significant bits of the values encoding the color of each pixel of the image.
02:06
The goal of steganography is to hide a message in one-to-one communications
02:13
ADVANTAGES
02:14
Can be done faster with large number of softwares
02:14
Difficult to detect. Only receiver could detect
02:14
Used in the way of hiding not the information but the password to reach the information.
02:22
DISADVANTAGES
02:23
If this technique is gone in the wrong hands like hackers, terrorists,criminals then this can be very much dangerous for all.
02:23
Huge number of data, huge file size, so someone can suspect about it
02:31
Last but not least, DIGITAL WATERMARKING
02:37
Digital Watermarking
02:37
A digital signal or pattern inserted into a digital document such text, graphics, video and carries information unique to the copyright owner, the creator of the document or the authorized consumer.
02:44
Divided into two types:
02:46
Visible watermarking
02:47
Invisible watermarking