1 User Manual for 2-Dimensional Key (2D Key) Input Method and
Contents
1. or two locations in the column dimension 3 There are many possible styles of keys for this input method Multiline passphrase crossword ASCII art graphics Unicode art graphics padding noise etc 4 The textbox of Key Entropy bit shows the effective key size in bit of key up to a maximum of 256 bits in the textbox of Secret key Field It is 6 57 bits per ASCII symbol log295 and 16 bit per Unicode symbol min 16 log298884 5 To avoid the automatic wrapping of symbols that causes the unwanted alignment enter ASCII and or Unicode symbols after checking the checkbox of Hide Key 6 For key style of multiline passphrase padding is needed for easy recognition of the starting location of each word in the passphrase First click the button of Clear Key Second check the checkboxes of Hide Key and Hide Hash to hide the key and hash respectively Third set the row to the number of words in the passphrase Fourth set the column to the number of character of the longest word in the passphrase Fifth enter the key of passphrase into the textbox of Secret Key Field One word is for one line For word shorter than the longest word pad it with a padding character until the length of the longest word Once finish if there is no threat of shoulder surfing attack from anyone to be able to view the displaying screen input key may be view to confirm the correctness by unchecking the checkbox of Hid2. styles is also encouraged Among them adding semantic noise s is the easiest This example can be observed as in Figure 2 using the exclamation mark Using semantic noise the effective key size can be adjusted by 6 or 7 bits per ASCII symbol and 16 bits per Unicode symbol 11 To know the more information of this software about its IPR Intellectual Property Rights and contact please click the button of Read Me ee The End
3. User Manual for 2 Dimensional Key 2D Key Input Method and System Version 2 0 as at O8Sep08 2D Key PW5 2 0 Free Edition Copyright 2008 Xpreeli Enterprise All rights reserved Requirement Pentium D 2 80 GHz or better 512 MB RAM or better Windows XP and Microsoft NET Framework Version 1 1 Redistributable Package 23698KB or better from http www microsoft com Procedure 1 Double click the icon of 2D_Key exe A window as in Figure will be shown 2D Key PW5 2 0 Free Edition Ror Height Column idth Hide 10 h 13 i Key Hash Secret Kep Field Hash Iteration Please enter a key with style s of multiline passphrase crossword ASCII art Unicode art padding HOPS Es ER os Halved Hash Field of SH4 51 2 Key Entropy bit hB Hash Kep Copy Hashed K Clear Kep Copy Kep Read Me Sten Fig 1 Starting screen of 2 dimensional key input method and system 2 The textbox of Secret Key Field can have inputs of printable ASCII symbols and graphic Unicode symbols depending on the support of end user s application For printable ASCII symbol keyboard can be used For graphic Unicode symbols enter a symbol using any input method via keyboard mouse etc For example holding the button of Alt enter the Unicode in decimal value and release the button of Alt to input a graphic Unicode symbol Try Alt and 0165 for Graphic Unicode symbols may occupy one
4. e Key Sixth for different unique slave keys from a master key at the Secret Key Field select the number of hash iteration from 1 to 5 For more slave keys please switch to higher version of 2D Key Seventh click the button of Hash Key to get a halved SHA 512 hash of the input key To view the hash uncheck the checkbox of Hide Hash Figure 2 displays an example of 4 x 5 multiline passphrase with padding character 2D Key PW5 2 0 Free Edition Ror Height Column idth Hide 4 Ken Hash secret Key Field Hash Iteration 1 d Halved Hash Field of SH4 51 2 OFDe2 APS TY RSSoCe FEB LDDs s6G65 ACRDELAILF 2 OLODI A CLICSYASSACC Ca420C8 Key Entropy bit 131 Copy Hashed Key Clear Kep Copy Kep Read Me Fig 2 Key style of multiline passphrase with padding character The number of ASCII characters is 20 4 x 5 and hence the nominal key size is 160 bits 8 x 20 Meanwhile the effective key size is 131 bits 20 x log295 For the one key encryption or symmetric encryption of 128 bit AES Advanced Encryption Standard 16 ASCII characters can give the nominal key size of 128 bits 8 x 16 However this is not enough for real security strength at 128 bits Effective key size has to be referred instead of nominal key size Hence security strength at 128 bits is achieved when the effective key size is more than 128 bits To insert to the prompt of key password space cl
5. ick either the button of Copy Key or Copy Hashed Key for the master key at the Secret Key Field or slave key at the Hash Field respectively Copy Key button copies the ASCII characters of the input master key Copy Hashed Key button copies the halved 512 bit hash i e slave key of the input master key As an information SHA 512 is used here Then click the key space of the prompt of any software application Press Ctrl V using the keyboard Now either the input master key or the halved SHA 512 hashed key 1 e slave key will be pasted Press Enter to gain authorization access Lastly press the button of Clear Key to clear the input master key or hashed key i e slave key in the clipboard of the computer memory 7 For key style of crossword background character is needed Figure 3 shows a 5 x 6 crossword with background character of Alike multiline passphrase either input master key or hashed key e slave key can be used This example can be used as a key for AES 192 HE 2D Key PW5 2 0 Free Edition Row Height Column idth Hide Key Hash Hash Iteration 2 Halved Hash Field of SH amp 4 51 2 DFF6FESOCOSSDSLA456 SJFE6GCFSAS40FDE9185i LOGLES FEES 295R21F0 OF 41064 Key Entropy bit 197 Copy Hashed K Clear Kep Copy kep Read Me Selene Fig 3 Key style of crossword with background character of 8 For key style of ASCII art graphics Figure 4
6. illustrates this type of example using a 2 dimensional key space of 7 x 6 The drawn graphics is the Han character of engineering in Chinese language Alike other key styles either input master key or hashed key 1 e slave key can be used This example can be used as a key for AES 256 ie 2D Key PW5 2 0 Free Edition Row Height Column 4idth T JAE x Secret Key Field Clear Kep Copy Kep Seles Hide Key Hash _ Halved Hash Field of SH4 51 2 JSS ABS oe le AF9E29170 JOVCS455Re2 FP Des De 45 IFADDS99Rar4a7a4CE56 j434 1D01 Hash Iteration Key Entropy bit chh Read Me Copy Hashed Kep Fig 4 Key style of ASCII art graphics 9 For key style of Unicode art graphics Figure 5 illustrates this type of example using a 2 dimensional key space of 4 x 5 The drawn graphics is the Han character of engineering in Chinese language using the Unicode symbols of Alt 0165 and Alt 0169 Alike other key styles either input master key or hashed key 1 e slave key can be used 2D Key PW5 2 0 Free Edition Ror Height Column idth Secret Rey Field Clear Kep Fig 5 Key style of Unicode art graphics Copy Kep Hide Key Hash Halved Hash Field of SH4 512 SIEFCY402 ALERSSZSSFO PSG YAFCAAAES F2GOR bR2B2 le 7004065446165 DSSGCE46 Hash Iteration Kep Entropy bit chB Copy Hashed kep Read Me 10 A mixture of various key
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