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Cryptography Tutorial
Cryptography Useful Resources
Selected Reading
The Data Encryption Standard (DES) is a symmetric-key block cipher published by the National Institute of Standards and Technology (NIST).
DES is an implementation of a Feistel Cipher. It uses 16 round Feistel structure. The block size is 64-bit. Though, key length is 64-bit, DES has an effective key length of 56 bits, since 8 of the 64 bits of the key are not used by the encryption algorithm (function as check bits only). General Structure of DES is depicted in the following illustration −
Since DES is based on the Feistel Cipher, all that is required to specify DES is −
Round function
Key schedule
Any additional processing − Initial and final permutation
Initial and Final Permutation
The initial and final permutations are straight Permutation boxes (P-boxes) that are inverses of each other. They have no cryptography significance in DES. The initial and final permutations are shown as follows −
Round Function
The heart of this cipher is the DES function, f. The DES function applies a 48-bit key to the rightmost 32 bits to produce a 32-bit output.
Expansion Permutation Box − Since right input is 32-bit and round key is a 48-bit, we first need to expand right input to 48 bits. Permutation logic is graphically depicted in the following illustration −
The graphically depicted permutation logic is generally described as table in DES specification illustrated as shown −
XOR (Whitener). − After the expansion permutation, DES does XOR operation on the expanded right section and the round key. The round key is used only in this operation.
Substitution Boxes. − The S-boxes carry out the real mixing (confusion). DES uses 8 S-boxes, each with a 6-bit input and a 4-bit output. Refer the following illustration −
The S-box rule is illustrated below −
There are a total of eight S-box tables. The output of all eight s-boxes is then combined in to 32 bit section.
Straight Permutation − The 32 bit output of S-boxes is then subjected to the straight permutation with rule shown in the following illustration:
Key Generation
The round-key generator creates sixteen 48-bit keys out of a 56-bit cipher key. The process of key generation is depicted in the following illustration −
The logic for Parity drop, shifting, and Compression P-box is given in the DES description.
DES Analysis
The DES satisfies both the desired properties of block cipher. These two properties make cipher very strong.
Avalanche effect − A small change in plaintext results in the very great change in the ciphertext.
Completeness − Each bit of ciphertext depends on many bits of plaintext.
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During the last few years, cryptanalysis have found some weaknesses in DES when key selected are weak keys. These keys shall be avoided.
DES has proved to be a very well designed block cipher. There have been no significant cryptanalytic attacks on DES other than exhaustive key search.
The Netflix service can be availed for free using the free Netflix codes.The free codes are only made available with the help of Netflix gift card code generator.
Now you can get free Netflix codes through Netflix streaming service that allows you to watch content online like movies, TV series and short films etc. It also has Netflix gift card service. Though, Netflix gift card facility is not available every country. Therefore, Netflix gift card can be used as an alternative to pay for your Netflix subscription in the currency of that particular country.
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If someone has a Netflix account in prior, and then he can easily redeem the free Netflix codes. All you have to do is to enter the code in your account page and your code will be redeemed. Once you have used Netflix gift card code for redemption then it saved in your payments, Therefore, your further payments will be done through Netflix gift card code automatically. There is no emergency or deadline to use the Netflix card code as it has no expiry date.
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The Netflix gift card codes can be used to use the Netflix for free. You get Netflix gift card code for free whether you make a payment or not. The gift Netflix card makes your transaction quite easy. Free Netflix gift card codes are provided by Netflix gift card code generator.
The Netflix service can be availed for free with the help of Netflix gift card codes. A lot of services can be enjoyed using free Netflix card. The codes that are used for redemption are generated by the Netflix gift card code generator.
Netflix Gift is not sold in every country. There is some country where Netflix gift card not work. But if you purchased the gift card of Netflix, you will use it as to pay for Netflix subscription in the same currency as the gift card does. Select the country from the Netflix gift card code generator and get your Netflix gift card code.
If you have an account on Netflix already, you can directly redeem the Free Netflix gift card codes. Just the entering the gift card code on the “Your Account” page.
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Netflix gift card not only used for Netflix subscription but you can also share it with your friends and family or anyone else you like. If you have a Netflix gift card at a different location still you can also purchase them online too.
Basically, this Netflix gift card has a 1 or 2-month subscription to the Netflix account. But still, now you can get this Netflix gift card code by using our Netflix gift card code generator in just one click.
No need to download any app or software on your device for using this Netflix gift card generator tool. Also, you will not need any kind of credit card information or email for using this tool.
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Discussing Netflix Gift Card Generator
You will be left in wonder the Netflix is one of the biggest online movies streaming applications that are used by millions today. But, the twist in the tale comes in where you have to pay a minimal amount as your part of subscription charges. This way you will be able to use Netflix in the most efficient manner.
It may happen that you are thinking at the back of your mind that you wish to use the services but without paying a single penny. This is where you will have to use your Netflix Gift Card generator.
In this manner, you will be given a Netflix gift card code through which you will be able to use Netflix quite easily.
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Netflix gift card not only used for Netflix Gift Card subscription but you can also share it with your friends and family or anyone else you like.
If you have a Netflix gift card at a different location still you can also purchase them online too.
So, What Is A Netflix Gift Card?
You might have a good idea that you will have to pay for your subscription charges of Netflix if you are a regular user of this app. The payment can well be made through your credit card or you can also well make use of the Netflix card for payment purposes.
Netflix gift cards are usually given to your friends as well as a family occasionally as a gift is what has been noted.
Over the Netflix App, the person who is receiving this card as a gift will be buying several subscriptions. As people nowadays have started to prefer watching Netflix over the other entertainment sources, they are also considered as one of the gifts that people usually purchase.
You can also get these cards both online and in the offline stores as this is the best part of the Netflix gift card code that you have.
Why Do You Need These Netflix Gift Card Codes?
You must have the Netflix Gift Card codes along with you if you really want to make use of the Netflix services for free. You will have to pay for the amount in the time of purchase as you can also get the Netflix gift card codes from the toll that is available online.
The transaction processes are transformed to be the easier ones through these gift card Netflix codes that are available for you now!
You will be left in wonder to note that you can avail of these Netflix Card codes for free with the help of the Netflix gift card generator. You can also purchase the monthly subscription charges that are there for Netflix as the same could well be used to purchase the monthly subscription.
Get more online gift card stuff for free such as free Nintendo eShop codes, Roblox gift card codes and Google Play code by using free services on our KeyCardGen.
Know The Types Of Netflix Gift Card
Several different types of Netflix gift cards are available for you. You need to select a single budget based on all if you are gifting this card to someone.
The amount that you are going to pay for the same is on what the type of Netflix gift card depends on mainly. You can get a hold on a gift card for $25 to even $100.
What Do You Understand By Netflix Gift Card Generator?
Many people ask this question. For generating the codes for free of cost, it is an online performing tool that assists you in this.
Without even paying for a single penny, you can well generate an unlimited number of codes. You can also have a blast on this service all for free as the generator codes work at its best.
Basically, this Netflix gift card has a 1 or 2-month subscription to the Netflix account. But still, now you can get this Netflix gift card code by using our Netflix gift card code generator in just one click.
No need to download any app or software on your device for using this Netflix gift card generator tool. Also, you will not need any kind of credit card information or email for using this tool.
Good news for you guys, now you can also enjoy Amazon Prime for free just by using our Amazon Gift Card Generator. So that you can use that gift card codes for free Amazon Prime account.
How To Redeem Netflix Gift Card Codes?
Step 1]
Once you have seen the generated Netflix gift card code, click the “Copy Code” button.
Step 2]
Once you copied the code go to netflix.com/redeem. When this page opens completely, you need to log in to Netflix by using your Netflix ID and Password.
If your new user and yet not have Netflix account ID, you need to sign up Netflix for and get your new Netflix ID and Password.
Step 3]
So I hope you logged in successfully… Now enter or paste the copied code, which you generated previously from the generator.
Step 4]
After successful verification, you are good to go for stream unlimited Movie, TV Series and much more.
You can enter this copied code in your profile if you have already a Netflix user. You can also redeem the gift card on Netflix mobile app or desktop site too.
After doing this the balance of your Netflix gift card will be automatically added to your Netflix account where the next payment will be taken from this gift card balance, which is, you added in your account already.
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Where Would You Be Using The Netflix Gift Card?
If you have this question in mind then probably you are completely new to this platform here. Netflix users know the answer to this question quite well.
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Once you have used these card you can start streaming every web series, movies and other things online for free.
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You will be able to download the movies as well as the episodes for watching them later on apart from the rest that is being delivered along with this app here.