`keyLength80`

definition

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module: IndisputableMonolith.Cryptography.KeyLengthFromPhiLadder
domain: Cryptography
line: 52 · github
papers citing: none yet

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IndisputableMonolith.Cryptography.KeyLengthFromPhiLadder on GitHub at line 52.

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formal source

  49  exact Real.sqrt_lt_sqrt (by norm_num) one_lt_phi
  50
  51/-- Standard symmetric key lengths (bits). -/
  52def keyLength80 : ℕ := 80
  53def keyLength128 : ℕ := 128
  54def keyLength256 : ℕ := 256
  55
  56theorem keyLength_doubling : keyLength128 * 2 = keyLength256 := by
  57  unfold keyLength128 keyLength256; norm_num
  58
  59structure KeyLengthCert where
  60  ratio_pos : 0 < securityLevelRatio
  61  ratio_gt_one : 1 < securityLevelRatio
  62  key_doubling : keyLength128 * 2 = keyLength256
  63
  64noncomputable def cert : KeyLengthCert where
  65  ratio_pos := securityLevelRatio_pos
  66  ratio_gt_one := securityLevelRatio_gt_one
  67  key_doubling := keyLength_doubling
  68
  69theorem cert_inhabited : Nonempty KeyLengthCert := ⟨cert⟩
  70
  71end
  72end KeyLengthFromPhiLadder
  73end Cryptography
  74end IndisputableMonolith

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