block

{
  "id": "MLC-T-CYB-000474",
  "term": "block",
  "field": "Cybersecurity",
  "definition": "1. A sequence of bits of a given fixed length. In this Standard, blocks consist of 128 bits, sometimes represented as arrays of bytes or words.\n\n2. A binary vector. In this document, the input and output of encryption and decryption operation are 64-bit block. The bits are numbered from left to right. The plaintext and ciphertext are segmented to k-bit blocks, k = 1, 8, 64.\n\n3. A subset of a bit string. A block has a predetermined length.\n\n4. For a given block cipher, a bit string whose length is the block size of the block cipher.\n\n5. A bit string whose length is the block size of the block cipher algorithm.\n\n6. In this Recommendation, a binary string, for example, a plaintext or a ciphertext, is segmented with a given length. Each segment is called a block. Data is processed block by block, from left to right.\n\n7. A data structure containing a block header and block data.",
  "references": [
    "FIPS 197 [NIST FIPS 197-upd1]",
    "NIST SP 800-20",
    "NIST SP 800-22 Rev. 1a",
    "NIST SP 800-38B; NIST SP 800-38D; NIST SP 800-38F; NIST IR 8459",
    "NIST SP 800-38C",
    "NIST SP 800-67 Rev. 2; NIST SP 800-67 Rev. 1 [Superseded]",
    "NISTIR 8202",
    "NIST CSRC Glossary"
  ],
  "url": "https://mlchart.com/terminology/cybersecurity/block/"
}