27:null 28:["$","title",null,{"children":"Perlin Cipher | Daniel Gamage | Observable"}] 2d:[] 2b:{"id":"3a1bc7a1d2af9400","slug":null,"title":"Perlin Cipher","thumbnail":"caf09a57ac50b93db2ccdec0d6466f47a9ecbd831c01ad35eba09ba132c34e2b","access_level":"public","create_time":"$D2023-02-04T03:57:53.204Z","update_time":"$D2023-02-04T19:09:04.969Z","view_time":null,"first_public_time":"$D2023-02-04T18:33:59.480Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"90e6c6f93f7e192d","login":"danielgamage","name":"Daniel Gamage","avatar_url":"https://avatars-next.observableusercontent.com/0b5b0c262ef36153251318b683161ec9f9282e3906a635688c9c54cdab053794","tier":"starter_2024"},"version":312,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"4f703014d88d7078","login":"danielgamage","name":"Daniel Gamage","avatar_url":"https://avatars-next.observableusercontent.com/0b5b0c262ef36153251318b683161ec9f9282e3906a635688c9c54cdab053794","tier":null}],"members":[{"type":"individual","id":"4f703014d88d7078","login":"danielgamage","name":"Daniel Gamage","avatar_url":"https://avatars-next.observableusercontent.com/0b5b0c262ef36153251318b683161ec9f9282e3906a635688c9c54cdab053794","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Perlin Cipher","cells":[{"id":0,"value":"# Perlin Cipher\nv0.1\n\nA varying rotational cipher to transpose alphabetical characters in a string.\n\nThe algorithm uses Perlin noise generators to enable reproducibility and varying transformations for each character. By that same token, the level of cryptographic security here is very low; in many cases at low `amplitude`, you can _see_ the original word, and the UI makes decryption a much easier task.\n\nWith that in mind, the intended use case here is more for artistic transpositions and stylizations of words than secrets. Only latin alphabetical characters are transposed.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":9,"value":"viewof input = Inputs.text({ label: \"String\", value: \"observable\" })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":26,"value":"viewof amplitude = Inputs.range([-100, 100], {\n label: \"Amplitude*\",\n step: 0.1,\n value: -50.4\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":108,"value":"viewof seed = Inputs.range([0, 65536], { label: \"Seed\", step: 1, value: 23405 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":132,"value":"viewof yTranslate = Inputs.range([0, 10], {\n label: \"Y Translate\",\n step: 0.01,\n value: 2.5\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":276,"value":"viewof scale = Inputs.range([1, 20], { label: \"Scale\", step: 0.1, value: 5 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":58,"value":"\n \n \n \n \n \n \n \n \n \n \n

Encrypted	Decrypted
${table.map((v) => v.Encrypted).join(\"\")}	${table.map((v) => v.Decrypted).join(\"\")}

\n\n","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":22,"value":"table","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":5,"value":"table = input\n .toLowerCase()\n .split(\"\")\n .map((character, i) => {\n const aPos = 97;\n const mod = 26;\n const charIsAlpha = character.match(/[a-z]/);\n const code = character.codePointAt(0);\n let offset;\n let encryptedCode;\n let decryptedCode;\n if (charIsAlpha) {\n offset = Math.round(amplitude * noise.perlin2(yTranslate, i / scale));\n encryptedCode = ((code + offset - aPos + mod * 100) % mod) + aPos;\n decryptedCode = ((code - offset - aPos + mod * 100) % mod) + aPos;\n } else {\n offset = 0;\n encryptedCode = code;\n decryptedCode = code;\n }\n\n return {\n Character: character,\n Code: code,\n Offset: offset,\n \"Encrypted Code\": encryptedCode,\n \"Decrypted Code\": decryptedCode,\n Encrypted: String.fromCodePoint(encryptedCode),\n Decrypted: String.fromCodePoint(decryptedCode)\n };\n })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":105,"value":"noise = {\n const n = new noisejs.Noise(seed);\n return n;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":102,"value":"noisejs = import(\"https://cdn.skypack.dev/noisejs@2.1.0\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W2d","stdlib":"1","titling":"auto"}} 2c:"$2b:body"