{"id":1422,"date":"2020-05-05T17:09:26","date_gmt":"2020-05-05T11:39:26","guid":{"rendered":"https:\/\/binaryterms.com\/?p=1422"},"modified":"2021-01-18T11:40:35","modified_gmt":"2021-01-18T06:10:35","slug":"advanced-encryption-standard-aes","status":"publish","type":"post","link":"https:\/\/binaryterms.com\/advanced-encryption-standard-aes.html","title":{"rendered":"Advanced Encryption Standard (AES)"},"content":{"rendered":"

Advanced Encryption Standard (AES) <\/strong>was introduced by NIST in 2001 is a symmetric block cipher<\/strong> which overcomes the key size weakness of DES. AES comes with the variable key sizes i.e. 128-bit key, 192-bit key and a 256-bit key. AES does not follow the Feistel structure in fact it operates on entire plaintext block at once instead of dividing them into two halves.<\/p>\n

AES can be applied in both hardware and software. In this section, we will discuss the encryption and decryption process of AES in detail. We will also discuss the round function of AES in brief.<\/p>\n

Content: Advanced Encryption Standard (AES)<\/h2>\n
    \n
  1. What is Advanced Encryption Standard?<\/a><\/li>\n
  2. AES Encryption<\/a><\/li>\n
  3. Round Functions<\/a><\/li>\n
  4. AES Decryption<\/a><\/li>\n
  5. Advantage and Disadvantage<\/a><\/li>\n
  6. Key Takeaways<\/a><\/li>\n<\/ol>\n

    <\/a><\/p>\n

    What is Advanced Encryption Standard (AES)?<\/h3>\n

    Advanced Encryption Standard was introduced by NIST<\/strong> (National Institute of Standard and Technology) in the year 2001<\/strong>. It is a symmetric block cipher<\/strong> and \u00a0No doubt it was introduced to overcome the weakness of DES (Data Encryption Standard).<\/p>\n

    AES cipher intakes the 128-bit plain text block accompanied by a 128-bit key to generate cipher text block of 128-bit. And while decryption it takes 128-bit cipher text block along with expanded key used in encryption in reverse order to recover the plain text block of 128-bit.<\/p>\n

    AES being a symmetric block cipher does not<\/strong> use the Feistel structure<\/strong> like DES<\/strong> where the plain text is divided into two halves. And one half of the plain text block helps in modifying the other half of plain text block and then both the halves are swapped.<\/p>\n

    AES operates on an entire block of plain text<\/strong> in the form of a single matrix at each round which includes substitution and permutation. AES has
    \n10 rounds -> 128-bit key
    \n12 rounds -> 192-bit key
    \n14 rounds -> 256-bit key<\/p>\n

    Let us discuss some key point before moving to the encryption process of AES.<\/p>\n