DES is a symmetric key algorithm used to encrypt the digital data. So you'll need 21 bytes. First and foremost, we need to generate a key. Key Generation of S-DES or How to Generate the Key of Simplified DES. The key for the 2 key version is then referred to as an ABA key and for the 3 key version as ABC key. Its wide deployment and small (by today's standards) key size make it an interesting target for attackers. In general, however, it is recommended to use an accepted, well-known key derivation algorithm to convert a text password to a symmetric cipher key, regardless of the algorithm. Despite the availability of these publications, choosing an appropriate key size to protect your system from attacks remains a headache as you need to read and understand all these papers. An attempt was made to set a weak key (see IsWeakKey(Byte[])) or a semi-weak key (see IsSemiWeakKey(Byte[])). The Data Encryption Standard (DES) has been the workhorse of cryptography for some 20 years. 6.1. DES uses a 56-bit key: 8 bytes where one bit in each byte is a parity bit. 2 Input text has an autodetect feature at your disposal. As we will see in Chapter 7, AES, the recent standard, is supposed to replace DES in the long run. With the help of this key we will encrypt the message. In this article you will learn about S-DES or Simplified Data Encryption Standard. Table 1. 6.1.2 Overview DES is a block cipher, as shown in Fig. First, permute the key in the following fashion. S-DES key generation. This block cipher encrypts the data, and the size of each block is 64 bits. • EFF (Electronic Frontier Foundation) in 1998 designed the DES Cracker form $250,000 which broke a DES key in 3 days. It began with a 64 bit key and then the NSA put a restriction to use of DES with a 56- bit key length, hence DES discards 8 bits of the 64 bit key and then uses the compressed 56 bit key derived from 64 bits key to encrypt data in block size of 64bits.DES can operate in different modes - CBC, ECB, CFB and OFB, making it flexible. The autodetect detects for you if the content of Input text field is in form of a plain text or a hexadecimal string. In which case you can use any length of characters (the more the better) and then trim the hashed output to your key size. Encryption DES 56-bit key Decryption cipher 64-bit ciphertext 64-bit plaintext DES reverse cipher renamed DES (Data Encryption Standard) • Controversy (collaboration with NSA, key size, secrecy behind design of S-boxes) • DES became the code provided by 99% of the companies selling equipment using encryption. The key size for TripleDES is 168 bits. Using a It uses 10-bits key size for encryption. In simple words, it takes 64 bits plain text as input and gives a 64 bits ciphertext output. From this key, two 8-bit subkeys are produced for use in particular stages of the encryption and decryption algorithm. Supported key lengths and IV lengths 1 You can use only hexadecimal characters, newlines, tabulators and new line characters if you decrypt a string. E.g. Those are the only standard versions of 3DES; you might have an API which allows 64 bit keys (which likely emulates DES in that case); if it allows 256 bit keys, I have no idea what it would do with them. S-DES depends on the use of a 10-bit key shared between sender and receiver. If this property is null when it is used, GenerateKey is called to create a new random value. recommends the use of triple DES (repeated DES cipher three times) for future applications. Let the 10-bit key be designated as (k1, K2, k3, k4, k5, k6, k7, k8, k9, k10). If you want to use a string for the key you really should hash it first. 1. 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