Let us continue with cryptography.
In this video, we are going to learn advanced encryption algorithms like data encryption standards
and advanced encryption standard is the data encryption standard.
This is an outdated key method of data encryption.
This is the secret key encryption scheme adopted as a standard in USA in 1977.
It uses a 56 bertke, which is truly considered by many to be insufficient as it can be cracked by brute
force, a variant called Tripolis, or tedious, uses a longer key and is more secure but has never
become popular.
The advanced encryption standard that this is is expected to supposedly is and is the standard encryption
algorithm.
The data encryption standard, the DEA is a jointly developed 1974 by IBM and the U.S. government to
set the standard that everyone could use to securely communicate with each other.
It operates on blocks of 64 bits using a secret key that is 56 Bedazzler.
The original proposal used a security that was a 64 bit sloup.
It is widely believed that the removal of these aid bills from the key was done to make it possible
for U.S. government agencies to secretly crack Mrs..
This started out as the Lucifer algorithm developed by IBM.
The US National Security Agency NSA made several modifications after which it was adopted as a federal
information boosting standard FBI Standard Politics three and and standard extra one nine to have a
look at a diagram on your screen.
We will discuss steps performed in the years ago.
The plain text is divided into 64, which blocks initial permutation is performed on 64 bit plain text
book.
Of the initial permutation block is divided into two halves of 32 bit, each left plaintext L and right
plaintext are.
And, ah, go through 16 rounds, each of which is filled with the 48 Besuki, the round KIGEN reader
is an algorithm which is filled with an input of 56 key, and it gives the output of 48 with round.
In case of these, the round algorithm is invoked 16 times after 16 ounce allanah a combined and then
the final permutation is performed combined bloc of 64, which is the result of this process, produces
a 64 bit ciphertext block.
After all, the blocks are processed, processed, we get a combined full ciphertext, this was quite
influential at that time and it's simple enough to understand four building blocks using modern ciphers.
But by now it is considered obsolete and insecure.
Some of the disadvantages of DSA, which is the gear that is selected on the rounds, are problem.
The splitting of keys in order to have and swiping them might throw the same result if death continues
ones and zeros, this ends up in using the same key 2016 cycles.
There can be the same output from different inputs and permutations.
These are called the keys.
The message is encrypted with a particular key and is taken once complained of that encryption with
the same as the encryption of the complement of the message and complement of the key.
Let us start with advanced encryption.
Standard is.
It is the symmetric encryption standard for security encryption.
U.S. was created by two Belgian cryptographers, Vincent Riesman and John Berman, as a replacement
of the old these.
The standard comprises with three blocks, Cyprus is 128, is 192 and is 256.
Each of the Cyprus has a 128 bit block size with geysers of 128, 192 and 256 bits, respectively.
The algorithm is name original and has several simple steps of known cryptographic mechanism that are
put in chain together.
So it is effectively hard to correct the algorithm.
The heart of algorithm is around its box mechanism substitution, then a second step about transposition
matrix operation influenced by the classical cipher.
And this is all going over and over and made it quite complex to break.
The U.S. has been adopted by the U.S. government and is now used worldwide.
It supersedes the data encryption standard, that is the disease which was published in 1977.
The algorithm described by eight years is a symmetric algorithm, meaning the same is used for both
encrypting and decryption the data.
Now I will tell you why he replace these with new and updated features.
Ediacara Block Encryption Implementation.
128 group encryption with 128, 192 and 256 with Killens Semitic algorithm requiring only one encryption
and decryption key data security for over 20 to 30 years, worldwide access, no royalties and all is
implementation.
In the next lecture, we will see asymmetric encryption with a real life example.