# Encipher and Decipher nKode ## Customer Policy - max nkode length: 10 - number of keys: 6 - properties per key: 9 - total number of properties: 54 ## Customer Cipher - property key: [58201 3855 47017 50828 14104 4268 29079 19099 12271 55135 54341 2465 32959 3356 36643 50702 8094 11335 39310 38981 55881 6507 22508 16345 19379 55560 52385 29733 25178 37713 59696 16347 14811 20691 101 35545 48103 63525 408 28174 57763 21416 59610 976 40160 13681 17146 54023 25410 42165 3856 59580 27726 13822] - position key: [59066 9448 56848 58798 57675 37475 8528 34148 34468] --- ## User Cipher - property key: [61737 49256 8018 54927 21709 65009 3885 46808 12375 11644 35339 52787 60805 49964 2754 34451 22775 9278 14454 37226 46352 60033 49123 21025 6479 60885 9059 20442 64510 63443 6758 52715 61370 9158 50160 8810 27528 11812 34328 47745 43244 9125 55623 10800 49542 55251 26390 19027 23252 5772 30639 25220 21506 59558] - passcode key: [54682 39190 21777 53204 58859 47387 24762 19698 44816 55464] - combined position key: [52800 11537 463 51813 36017 64303 52526 57594 11887] - mask key: [61564 54039 23310 1396 28615 39019 39047 46821 40711 32470] ### Combined Postion Key ```mermaid block-beta columns 2 user_pos["user position key:\n[19938 59072 31217 46834 52213 218 38377 1271 54783]"] customer_pos["customer position key:\n[59066 9448 56848 58798 57675 37475 8528 34148 34468]"] space:2 xor(("XOR")):2 user_pos --> xor customer_pos --> xor space:2 comb_pos["combined position key\n[52800 11537 463 51813 36017 64303 52526 57594 11887]"]:2 xor --> comb_pos ``` ## User Keypad - keypad example:
Key 0: [27 19 38 30 31 41 6 7 26]
Key 1: [36 37 11 48 4 23 51 34 44]
Key 2: [45 1 20 12 49 50 15 52 53]
Key 3: [18 46 47 3 22 5 33 43 35]
Key 4: [ 9 28 29 21 13 14 42 16 17]
Key 5: [ 0 10 2 39 40 32 24 25 8]
- user passcode indices: [30, 38, 11, 51] ## nKode Cipher ### Passcode Hash ```mermaid block-beta columns 2 cprop["customer_property_key\n[58201 3855 47017 50828 14104 4268 29079 19099 12271 55135 54341 2465 32959 3356 36643 50702 8094 11335 39310 38981 55881 6507 22508 16345 19379 55560 52385 29733 25178 37713 59696 16347 14811 20691 101 35545 48103 63525 408 28174 57763 21416 59610 976 40160 13681 17146 54023 25410 42165 3856 59580 27726 13822]"] uprop["user_property_key\n[61737 49256 8018 54927 21709 65009 3885 46808 12375 11644 35339 52787 60805 49964 2754 34451 22775 9278 14454 37226 46352 60033 49123 21025 6479 60885 9059 20442 64510 63443 6758 52715 61370 9158 50160 8810 27528 11812 34328 47745 43244 9125 55623 10800 49542 55251 26390 19027 23252 5772 30639 25220 21506 59558]"] space:2 xor1(("XOR")):2 cprop --> xor1 uprop --> xor1 space:2 prop["combined_property_key\n[27145 64606 2214 956 59410 24299 43596 51759 39102 28353 20824 14874 27994 60897 60356 49474 41290 62135 52049 26214 37014 45529 43514 40298 25315 52116 23008 2744 3269 7285 34470 4311 21401 14127 50809 13541 5394 30989 34092 27076 35814 63505 33710 18123 25966 61467 19353 14805 58907 44436 41458 3440 7755 35403]"] xor1 --> prop pass["user_passcode_indices\n[30, 38, 11, 51]"] space:2 sel(("select\nproperties")):2 pass --> sel prop --> sel space:2 passcode["user passcode properties:\n[34470 34092 14874 3440]"]:2 sel --> passcode space:2 pad["zero pad to\nmax nkode length: 10"]:2 passcode -->pad space:2 paddedpasscode["padded passcode:\n[34470 34092 14874 3440 0 0 0 0 0 0]"] pad --> paddedpasscode passkey["passcode key:\n[54682 39190 21777 53204 58859 47387 24762 19698 44816 55464]"] space:2 xor2(("XOR")):2 passkey --> xor2 paddedpasscode --> xor2 space:2 cipheredpass["ciphered passcode:\n[21308 7226 28427 49828 58859 47387 24762 19698 44816 55464]"]:2 xor2 --> cipheredpass space:2 hash(("hash")):2 cipheredpass --> hash space:2 cipheredhashed["hashed ciphered passcode:\n$2b$12$uR5ilcM4r.xjbzW4kGWf2.tbGVWSwrnqp1s6sGzqUmgcE1ncQK8UW"]:2 hash --> cipheredhashed ``` ### Mask Encipher ```mermaid block-beta columns 3 passcode_idx["passcode indices:\n[30, 38, 11, 51]"] comb_pos["combined position key:\n[52800 11537 463 51813 36017 64303 52526 57594 11887]"] cust_pos["customer position key:\n[59066 9448 56848 58798 57675 37475 8528 34148 34468]"] space:3 propidx(["Get Position Idx:\nmap each to element mod props_per_key"]) passcode_idx-->propidx space:1 xor1(("XOR")) comb_pos --> xor1 cust_pos --> xor1 space:3 passcode_position_idx["passcode poition indices:\n[3, 2, 2, 6]"] propidx --> passcode_position_idx space:5 pad1(("Pad with\nrandom indices")) passcode_position_idx --> pad1 space:5 posidx["Padded Passcode Position Indices:\n[3, 2, 2, 6, 1, 2, 3, 6, 8, 5]"] pad1 --> posidx space:1 user_pos["user position key:\n[19938 59072 31217 46834 52213 218 38377 1271 54783]"] xor1 --> user_pos space:4 sel(("select positions")) user_pos --> sel posidx --> sel space:5 passcode_pos["ordered user passcode positions:\n[46834 31217 31217 38377 59072 31217 46834 38377 54783 218]"] sel --> passcode_pos mask_key["mask key\n[61564 54039 23310 1396 28615 39019 39047 46821 40711 32470]"] space:4 xor2(("XOR")) mask_key --> xor2 passcode_pos --> xor2 space:5 mask["enciphered mask:\n [18062 43750 8959 37021 35079 57754 11893 8972 19192 32268]"] xor2 --> mask ``` ### Validate nKode ```mermaid block-beta columns 3 selected_keys["keys selected by user during login:\n[0, 0, 1, 1]"] login_keypad["login keypad:\nKey 0: [27 19 38 30 31 41 6 7 26] Key 1: [36 37 11 48 4 23 51 34 44] Key 2: [45 1 20 12 49 50 15 52 53] Key 3: [18 46 47 3 22 5 33 43 35] Key 4: [ 9 28 29 21 13 14 42 16 17] Key 5: [ 0 10 2 39 40 32 24 25 8] "] space:4 selectkeys(("filter keys")) mask["enciphered mask:\n [18062 43750 8959 37021 35079 57754 11893 8972 19192 32268]"] mask_key["mask key:\n[61564 54039 23310 1396 28615 39019 39047 46821 40711 32470]"] space:2 xor1(("XOR")) mask --> xor1 mask_key --> xor1 selected_keys --> selectkeys login_keypad --> selectkeys space:3 ordered_keys["ordered keys:\n[[27 19 38 30 31 41 6 7 26] [27 19 38 30 31 41 6 7 26] [36 37 11 48 4 23 51 34 44] [36 37 11 48 4 23 51 34 44]]"] user_position_key["user position key:\n[19938 59072 31217 46834 52213 218 38377 1271 54783]"] passcode_pos["ordered user passcode positions:\n[46834 31217 31217 38377 59072 31217 46834 38377 54783 218]"] selectkeys --> ordered_keys xor1 --> passcode_pos space:8 get_passcode_idxs(("recover passcode\nposition indices")) user_position_key --> get_passcode_idxs passcode_pos --> get_passcode_idxs space:8 passcode_pos_idxs["padded passcode position indices:\n[3, 2, 2, 6, 1, 2, 3, 6, 8, 5]"] get_passcode_idxs --> passcode_pos_idxs space:3 get_presumed_idxs(("recover passcode\nproperty indices")) ordered_keys --> get_presumed_idxs passcode_pos_idxs --> get_presumed_idxs space:5 passcode_prop_idxs["presumed passcode property indices:\n[30, 38, 11, 51]"] prop["combined_property_key\n[27145 64606 2214 956 59410 24299 43596 51759 39102 28353 20824 14874 27994 60897 60356 49474 41290 62135 52049 26214 37014 45529 43514 40298 25315 52116 23008 2744 3269 7285 34470 4311 21401 14127 50809 13541 5394 30989 34092 27076 35814 63505 33710 18123 25966 61467 19353 14805 58907 44436 41458 3440 7755 35403]"] cipheredhashed["hashed ciphered passcode:\n$2b$12$uR5ilcM4r.xjbzW4kGWf2.tbGVWSwrnqp1s6sGzqUmgcE1ncQK8UW"] get_presumed_idxs --> passcode_prop_idxs space:3 sel(("select\nproperties")) passcode_prop_idxs --> sel prop --> sel space:5 passcode_prop["presumed passcode properties:\n[34470 34092 14874 3440]"] sel --> passcode_prop space:5 cipher(("encipher")) passcode_prop --> cipher space:5 cipheredpass["ciphered passcode:\n[21308 7226 28427 49828 58859 47387 24762 19698 44816 55464]"] cipher --> cipheredpass space:7 comp{"compare"} cipheredpass --> comp cipheredhashed --> comp space:5 suc(("success")) comp --"Equal"--> suc ``` ### Renew nKode nKode renewal is a three step process: 1. Renew Customer Keys 2. Intermediate User Keys 3. Renew User Keys on Login ```mermaid flowchart subgraph Renew Customer Keys old_prop["`old customer property key:
[39712 15414 6132 54579 48351 41754 42337 31991 43241 17341 56147 62505 32991 11981 57606 18385 63933 54921 62247 63244 9606 23384 5657 53067 31660 9793 31363 17762 63291 60326 40128 56636 48163 5353 1417 5775 32410 22313 820 54085 8970 56244 23273 27899 42216 10184 11407 29574 48335 47896 54877 28660 19017 25325]`"] new_prop["`new customer property key:
[58201 3855 47017 50828 14104 4268 29079 19099 12271 55135 54341 2465 32959 3356 36643 50702 8094 11335 39310 38981 55881 6507 22508 16345 19379 55560 52385 29733 25178 37713 59696 16347 14811 20691 101 35545 48103 63525 408 28174 57763 21416 59610 976 40160 13681 17146 54023 25410 42165 3856 59580 27726 13822]`"] old_pos["`old customer position key:
[33698 52177 30782 31895 18244 64501 22727 58381 64400]`"] new_pos["`new customer position key:
[59066 9448 56848 58798 57675 37475 8528 34148 34468]`"] xor1(("XOR")) xor2(("XOR")) xor_prop["`xor property key:
[30841 13113 41053 5055 35783 46006 54518 13932 34566 38114 3862 64904 96 9169 28197 33247 58915 64206 27305 28489 65487 16947 16885 61586 12319 65353 46626 12615 38241 30967 30192 58087 34296 17466 1516 40022 50557 44812 684 48459 49833 34844 45619 28459 14344 4793 28277 41089 57229 8109 55629 34632 9735 22291]`"] xor_pos["`xor position key:
[25880 61241 42542 39225 42511 27030 31127 24937 32052]`"] old_prop --> xor1 new_prop --> xor1 xor1 --> xor_prop old_pos --> xor2 new_pos --> xor2 xor2 --> xor_pos end subgraph Intermediate User Keys users@{shape: procs, label: "users"} users --> eachuser subgraph eachuser [for each user] subgraph old user keys old_user_pos["`combined position key:
[19938 59072 31217 46834 52213 218 38377 1271 54783]`"] old_user_prop["`property key:
[61737 49256 8018 54927 21709 65009 3885 46808 12375 11644 35339 52787 60805 49964 2754 34451 22775 9278 14454 37226 46352 60033 49123 21025 6479 60885 9059 20442 64510 63443 6758 52715 61370 9158 50160 8810 27528 11812 34328 47745 43244 9125 55623 10800 49542 55251 26390 19027 23252 5772 30639 25220 21506 59558]`"] old_renew["renew: False"] end xor3(("XOR")) xor4(("XOR")) old_user_pos --> xor3 xor_pos --> xor3 xor3 --> inter_user_pos old_user_prop --> xor4 xor_prop --> xor4 xor4 --> inter_user_prop subgraph inter_user[intermediate user keys] inter_user_pos["`combined position key:
[43864 49704 42977 21340 10942 37561 46265 33171 21339]`"] inter_user_prop["`property key:
[35152 62289 48911 50480 57098 20039 56283 32948 46929 47518 34077 13243 60901 57597 25831 1868 48852 57072 21215 65059 19167 43186 65046 41651 10576 4764 38209 32413 28319 36644 28566 12044 27202 26620 50716 48700 44789 33064 33972 1994 27205 43961 27508 17691 63886 50538 2403 60114 34137 2337 44770 58828 29189 49077]`"] inter_renew["renew: True"] end end end subgraph Renew User Keys on Login login["First login post renew"] inter_user --> login subgraph new_user [New User Keys] new_user_pos["`combined position key:
[ 6533 37152 58679 48102 36450 2846 47432 25286 7670]`"] new_user_prop["`property key:
[46243 7833 58428 7967 9894 32124 48453 54560 26021 20475 10880 7429 26439 31401 37980 56964 32338 15187 9442 19302 53060 31276 34465 43143 33088 8587 47204 47532 45177 35842 11142 47055 40284 49647 9306 58542 63251 40940 32915 53183 16853 43890 60339 30610 6078 59395 7618 59221 44934 37153 10149 59493 8228 59563]`"] new_renew["renew: False"] end login --> new_user end ```