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> XOR with very large keys is how critical military encryption systems such as radios work. Cool! Do you have any references?

• chrisseaton 5y ago
  For example the TETRA standard for trunked radio, "The key stream bits shall be modules 2 added (XORed) with plain text bits in data, speech and control channels".
  • fanf2 5y ago
    In the TETRA specification they use the term “key stream” to mean the output of a stream cipher, which they call a “key stream generator”. They aren’t XORing directly with a large key - the TETRA key size is 80 bits. See section 6.3.2.2 of https://www.etsi.org/deliver/etsi_en/300300_300399/30039207/02.01.01_60/en_30039207v020101p.pdf https://www.etsi.org/deliver/etsi_en/300300_300399/30039207/...
    • chrisseaton 5y ago
      Yes you can programatically generate a key.
      • marcan_42 5y ago
        And we call that a stream cipher, not "XOR encryption", even though it uses a XOR operation. You're programmatically generating a keystream, which is not the same thing as a key.
        • ncmncm 5y ago
          See, this is why we can't have secure things.