DES

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  • Data Encryption Standard (DES) is the symmetric block cipher which encrypts a 64-bit plain text in a 64-bit ciphertext.[1]
  • The DES was introduced by the National Institute of Standard and Technology (NIST) in the 1970s.[1]
  • the same key is used in encryption and decryption process of DES.[1]
  • The diagram below illustrates the working of DES.[1]
  • That is why NIST announced that there was an imminent need for a better and more developed replacement of DES.[2]
  • As a result, DES has been deprecated, and replaced by the Advanced Encryption Standard (AES).[3]
  • DES has been widely deployed since its release in the 1970s, and many systems rely on it today.[3]
  • In addition to backward compatibility, in isolated instances there may be other valid arguments for continued DES support.[3]
  • Clearly, DES cannot be considered a "strong" cryptographic algorithm by today's standards.[3]
  • DES has been changed by modern encryption algorithms that are a very important role in the safety of IT systems and communications.[4]
  • Data Encryption Standard helped to indorse the study of cryptography and the progress of new encryption algorithms.[4]
  • Till DES, cryptography was a vague smart idea limited to the military and government organizations.[4]
  • Distributed.net and the Electronic Frontier Foundation played an original role to break DES.[4]
  • DES uses a 56-bit encryption key (8 parity bits are stripped off from the full 64-bit key) and encrypts data in blocks of 64 bits.[5]
  • Definition - What does Data Encryption Standard (DES) mean?[6]
  • The Data Encryption Standard (DES) algorithm uses a key to encrypt/decipher a 64 bit block data.[7]
  • I examined some DES implementations in vain, searching for such code.[8]
  • Every so often, we encounter someone still using antiquated DES for encryption.[9]
  • DES is a symmetric block cipher (shared secret key), with a key length of 56-bits.[9]
  • The final DES III challenge in early 1999 only took 22 hours and 15 minutes.[9]
  • In terms of structure, DES uses the Feistel network which divides the block into two halves before going through the encryption steps.[9]
  • The Data encryption standard is mandated through the Information security policy (IS18:2018).[10]
  • DES is based on the Feistel block cipher, called LUCIFER, developed in 1971 by IBM cryptography researcher Horst Feistel.[11]
  • DES became the approved federal encryption standard in November 1976 and subsequently reaffirmed as the standard in 1983, 1988, and 1999.[11]
  • Triple DES is a symmetric key-block cipher which applies the DES cipher in triplicate.[11]
  • Encryption strength is related to the key size, and DES found itself a victim of the ongoing technological advances in computing.[11]
  • Data Encryption Standard (DES) is a symmetric-key block cipher which encrypts data in blocks of size of 64 bit each.[12]
  • However, DES can relatively easily be broken with an exhaustive key-search attack.[12]
  • The DES (Data Encryption Standard) algorithm is the most widely used encryption algorithm in the world.[13]
  • But first a bit of history of how DES came about is appropriate, as well as a look toward the future.[13]
  • DES was quickly adopted for non-digital media, such as voice-grade public telephone lines.[13]
  • Meanwhile, the banking industry, which is the largest user of encryption outside government, adopted DES as a wholesale banking standard.[13]
  • After the expansion permutation, DES does XOR operation on the expanded right section and the round key.[14]
  • DES uses 8 S-boxes, each with a 6-bit input and a 4-bit output.[14]
  • The DES satisfies both the desired properties of block cipher.[14]
  • During the last few years, cryptanalysis have found some weaknesses in DES when key selected are weak keys.[14]
  • The DES is a product block cipher in which 16 iterations, or rounds, of substitution and transposition (permutation) process are cascaded.[15]
  • The security of the DES is no greater than its work factor—the brute-force effort required to search 256 keys.[15]
  • For some time it had been apparent that the DES, though never broken in the usual cryptanalytic sense, was no longer secure.[15]
  • This is known as “triple DES” and involves using two normal DES keys.[15]
  • DES is a block cipher and works on a fixed-size block of data.[16]
  • DES uses a 56-bit key and provides sufficient security for most commercial applications.[16]
  • On 17 March 1975, the proposed DES was published in the Federal Register.[17]
  • Alan Konheim (one of the designers of DES) commented, "We sent the S-boxes off to Washington.[17]
  • Another member of the DES team, Walter Tuchman, stated "We developed the DES algorithm entirely within IBM using IBMers.[17]
  • In 1973 NBS solicited private industry for a data encryption standard (DES).[17]
  • It took another year for a joint IBM–NSA effort to turn Lucifer into DES.[18]
  • This ensured that DES was quickly adopted by industries such as financial services, where the need for strong encryption is high.[19]
  • To encrypt a plaintext message, DES groups it into 64-bit blocks.[19]
  • DES uses a 64-bit key, but eight of those bits are used for parity checks, effectively limiting the key to 56-bits.[19]
  • Even so, DES remained a trusted and widely used encryption algorithm through the mid-1990s.[19]
  • We have mention that DES uses a 56 bit key.[20]
  • However, before the DES process even starts, every 8th bit of the key is discarded to produce a 56 bit key.[20]
  • DES consists of 16 steps, each of which is called as a round.[20]

소스

  1. ↑ 1.0 1.1 1.2 1.3 What is Data Encryption Standard (DES)? Definition, Working, Advantages and Disadvantages
  2. ↑ What is AES Encryption and How it Works?
  3. ↑ 3.0 3.1 3.2 3.3 Security Implications of Using the Data Encryption Standard (DES)
  4. ↑ 4.0 4.1 4.2 4.3 Data Encryption Standard and Their Importance
  5. ↑ From DES to Modern Algorithms
  6. ↑ What is Data Encryption Standard (DES)?
  7. ↑ Cryptography/Data Encryption Standard
  8. ↑ Strength of two data encryption standard implementations under timing attacks
  9. ↑ 9.0 9.1 9.2 9.3 AES vs. DES Encryption: Why AES has replaced DES, 3DES and TDEA
  10. ↑ Data encryption standard
  11. ↑ 11.0 11.1 11.2 11.3 What is DES?: Understanding DES Algorithm and Operation
  12. ↑ 12.0 12.1 DES — Data Encryption Standard. A symmetric-key Block cipher…
  13. ↑ 13.0 13.1 13.2 13.3 The DES Algorithm Illustrated
  14. ↑ 14.0 14.1 14.2 14.3 Data Encryption Standard
  15. ↑ 15.0 15.1 15.2 15.3 Data Encryption Standard | cryptology
  16. ↑ 16.0 16.1 Data Encryption Standard - an overview
  17. ↑ 17.0 17.1 17.2 17.3 Data Encryption Standard
  18. ↑ Data encryption standard (DES)
  19. ↑ 19.0 19.1 19.2 19.3 What is Data Encryption Standard (DES)?
  20. ↑ 20.0 20.1 20.2 Data encryption standard (DES)

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  • [{'LEMMA': 'DEA'}]
  • [{'LOWER': 'data'}, {'LOWER': 'encryption'}, {'LEMMA': 'Algorithm'}]
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