What are the steps of DES?

The encryption process step (step 4, above) is further broken down into five stages:

• Key transformation.
• Expansion permutation.
• S-Box permutation.
• P-Box permutation.
• XOR and swap.

What is the encryption process in Triple DES?

Triple DES is a encryption technique which uses three instance of DES on same plain text. It uses there different types of key choosing technique in first all used keys are different and in second two keys are same and one is different and in third all keys are same.

What is the first step of DES encryption process?

Step-1: Key transformation – We have noted initial 64-bit key is transformed into a 56-bit key by discarding every 8th bit of the initial key. Thus, for each a 56-bit key is available. From this 56-bit key, a different 48-bit Sub Key is generated during each round using a process called as key transformation.

How does DES encryption work?

DES works by using the same key to encrypt and decrypt a message, so both the sender and the receiver must know and use the same private key. Once the go-to, symmetric-key algorithm for the encryption of electronic data, DES has been superseded by the more secure Advanced Encryption Standard (AES) algorithm.

What are the steps involved in DES encryption?

This article explains the various steps involved in DES-encryption, illustrating each step by means of a simple example. Since the creation of DES, many other algorithms (recipes for changing data) have emerged which are based on design principles similar to DES.

How big is the encryption key in Des?

The same algorithm and key are used for encryption and decryption, with minor differences. The key length is 56 bits. The basic idea is show in figure. We have mention that DES uses a 56 bit key. Actually, the initial key consists of 64 bits. However, before the DES process even starts, every 8th bit of the key is discarded to produce a 56 bit key.

When did the DES encryption algorithm come out?

Check out course curriculum. What is the DES Algorithm? The DES (Data Encryption Standard) algorithm is a symmetric-key block cipher created in the early 1970s by an IBM team and adopted by the National Institute of Standards and Technology (NIST).

How is des used to decrypt a message?

DES takes as input a secret message that will be encrypted: And a 64bit Key, that will be used to both encrypt and decrypt: Resulting in a Ciphertext: In general, a 64-bit key is used as input for DES, of which only 56-bits are used. 16 subkeys, with 48-bit each, will then be created from this 56-bits.

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