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TLINDEN
212
README.md
212
README.md
@@ -7,7 +7,7 @@ Published under the public domain, Creative Commons Zero License. It works bytew
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with keys between 1-256 bits in 17 rounds, uses S-Boxes and key output-feedback mode.
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The cipher also works with CBC or ECB mode (sample CBC implementation included).
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The name TWENTY4 is a reverence to article 20 paragraph 4 of the german constitution
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The name TWENTY4 is a reference to article 20 paragraph 4 of the german constitution
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which reads:
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> All Germans shall have the right to resist any person seeking to
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@@ -33,9 +33,9 @@ published in the Federal Law Gazette Part III, classification number
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Linux Shell commands to generate the S-Boxes:
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curl -o BJNR000010949.epub http://www.gesetze-im-internet.de/gg/BJNR000010949.epub
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echo grundgesetz > BJNR000010949.pass
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cat BJNR000010949.epub | openssl aes-256-cbc -kfile BJNR000010949.pass | ./gen-static-sbox
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curl -o BJNR000010949.epub http://www.gesetze-im-internet.de/gg/BJNR000010949.epub
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echo grundgesetz > BJNR000010949.pass
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cat BJNR000010949.epub | openssl aes-256-cbc -kfile BJNR000010949.pass | ./gen-static-sbox
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'gen-static-sbox' compiled from gen-static-sbox.c in this directory, which has SHA256
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checksum: 29bfd8bd6dbca696d4d8b7ca997497e091875d6bf939e9702b1edf669d0742b0.
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@@ -45,10 +45,10 @@ byte array, ignoring possible duplicates, and prints it out as hex.
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Both S-Boxes are bijective and have the following properties (calculated using analyze.c):
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Char distribution: 100.000000%
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Char redundancy: 0.000000%
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Char entropy: 8.000000 bits/char
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Compression rate: 0.000000%
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Char distribution: 100.000000%
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Char redundancy: 0.000000%
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Char entropy: 8.000000 bits/char
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Compression rate: 0.000000%
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TWENTY4 uses two S-Box arrays, one for key expansion and one for encryption.
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@@ -57,61 +57,61 @@ TWENTY4 uses two S-Box arrays, one for key expansion and one for encryption.
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The input key will be expanded into a 17 byte array. Maximum key size is
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17 bytes (136 bit).
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IV = KU[0]
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for ROUND in 0..16
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if KU[ROUND]
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K[ROUND] = IV xor KU[ROUND]
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else
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K[ROUND] = IV yor KBOX[ROUND * 8];
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endif
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K[ROUND] = KBOX[K[ROUND]]
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IV = K[ROUND]
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endfor
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IV = KU[0]
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for ROUND in 0..16
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if KU[ROUND]
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K[ROUND] = IV xor KU[ROUND]
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else
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K[ROUND] = IV yor KBOX[ROUND * 8];
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endif
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K[ROUND] = KBOX[K[ROUND]]
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IV = K[ROUND]
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endfor
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for KROUND in 0..31
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for ROUND in 0..17
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K[ROUND] = IV xor (rotateleft-3(K[ROUND]) xor KBOX[rcon(IV)])
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IV = K[ROUND]
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endfor
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endfor
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for KROUND in 0..31
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for ROUND in 0..17
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K[ROUND] = IV xor (rotateleft-3(K[ROUND]) xor KBOX[rcon(IV)])
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IV = K[ROUND]
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endfor
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endfor
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where:
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KU: input key
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K[17]: initial round key array
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ROUND: encryption round 1-17
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KROUND: key expansion round 1-32
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KBOX[256]: pre computed S-Box for key expansion
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KU: input key
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K[17]: initial round key array
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ROUND: encryption round 1-17
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KROUND: key expansion round 1-32
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KBOX[256]: pre computed S-Box for key expansion
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## Encryption
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for INBYTE in <INSTREAM>
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OUTBYTE = INBYTE
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for ROUND in 0..17
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OUTBYTE = OUTBYTE xor K[ROUND]
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OUTBYTE = OUTBYTE xor SBOX[OUTBYTE]
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OUTBYTE = rotateleft-ROUND%8(OUTBYTE)
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OUTBYTE = rotateright-4(K[ROUND])
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endfor
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rotatekey(K, OUTBYTE)
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OUTBYTE => <OUTSTREAM>
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endfor
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for INBYTE in <INSTREAM>
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OUTBYTE = INBYTE
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for ROUND in 0..17
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OUTBYTE = OUTBYTE xor K[ROUND]
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OUTBYTE = OUTBYTE xor SBOX[OUTBYTE]
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OUTBYTE = rotateleft-ROUND%8(OUTBYTE)
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OUTBYTE = rotateright-4(K[ROUND])
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endfor
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rotatekey(K, OUTBYTE)
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OUTBYTE => <OUTSTREAM>
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endfor
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func rotatekey(K, B)
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[rotate K[17] array elementy 1 to the right]
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for N in 0..16:
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K[N] = KBOX[K[N] xor B]
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endfor
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endfunc
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func rotatekey(K, B)
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[rotate K[17] array elementy 1 to the right]
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for N in 0..16:
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K[N] = KBOX[K[N] xor B]
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endfor
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endfunc
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where:
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K[17]: expanded key
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ROUND: encryption round 1-17
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INBYTE: one input byte
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OUTBYTE: encrypted result for output
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SBOX[256]: pre computed S-Box for encryption
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K[17]: expanded key
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ROUND: encryption round 1-17
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INBYTE: one input byte
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OUTBYTE: encrypted result for output
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SBOX[256]: pre computed S-Box for encryption
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## Analysis so far
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@@ -129,84 +129,84 @@ passphrase.
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My own measurement, see analyze.c:
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File size: 35147 bytes
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Char distribution: 100.000000%
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Char redundancy: 0.000000%
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Char entropy: 7.995333 bits/char
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Compression rate: 0.000000% (35147 => 35168 bytes)
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File size: 35147 bytes
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Char distribution: 100.000000%
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Char redundancy: 0.000000%
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Char entropy: 7.995333 bits/char
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Compression rate: 0.000000% (35147 => 35168 bytes)
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For comparision, AES result:
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File size: 35168 bytes
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Char distribution: 100.000000%
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Char redundancy: 0.000000%
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Char entropy: 7.994892 bits/char
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Compression rate: 0.000000% (35168 => 35189 bytes)
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File size: 35168 bytes
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Char distribution: 100.000000%
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Char redundancy: 0.000000%
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Char entropy: 7.994892 bits/char
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Compression rate: 0.000000% (35168 => 35189 bytes)
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## Check using ent
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(ent from http://www.fourmilab.ch/random/):
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Entropy = 7.995333 bits per byte.
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Entropy = 7.995333 bits per byte.
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Optimum compression would reduce the size
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of this 35147 byte file by 0 percent.
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Optimum compression would reduce the size
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of this 35147 byte file by 0 percent.
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Chi square distribution for 35147 samples is 229.98, and randomly
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would exceed this value 86.79 percent of the times.
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Chi square distribution for 35147 samples is 229.98, and randomly
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would exceed this value 86.79 percent of the times.
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Arithmetic mean value of data bytes is 127.6631 (127.5 = random).
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Monte Carlo value for Pi is 3.172955438 (error 1.00 percent).
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Serial correlation coefficient is -0.004405 (totally uncorrelated = 0.0).
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Arithmetic mean value of data bytes is 127.6631 (127.5 = random).
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Monte Carlo value for Pi is 3.172955438 (error 1.00 percent).
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Serial correlation coefficient is -0.004405 (totally uncorrelated = 0.0).
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For comparision, AES result:
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Entropy = 7.994892 bits per byte.
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Entropy = 7.994892 bits per byte.
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Optimum compression would reduce the size
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of this 35168 byte file by 0 percent.
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Optimum compression would reduce the size
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of this 35168 byte file by 0 percent.
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Chi square distribution for 35168 samples is 250.98, and randomly
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would exceed this value 55.94 percent of the times.
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Chi square distribution for 35168 samples is 250.98, and randomly
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would exceed this value 55.94 percent of the times.
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Arithmetic mean value of data bytes is 127.8717 (127.5 = random).
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Monte Carlo value for Pi is 3.151680601 (error 0.32 percent).
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Serial correlation coefficient is 0.002014 (totally uncorrelated = 0.0).
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Arithmetic mean value of data bytes is 127.8717 (127.5 = random).
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Monte Carlo value for Pi is 3.151680601 (error 0.32 percent).
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Serial correlation coefficient is 0.002014 (totally uncorrelated = 0.0).
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## Check using dieharder
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I fed the contents of my primary disk into TWENTY4 and its output
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into diehard:
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dd if=/dev/sda4 of=/dev/stdout | ./stream 1 e | dieharder -a -g 200
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#=============================================================================#
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# dieharder version 3.31.1 Copyright 2003 Robert G. Brown #
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#=============================================================================#
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rng_name |rands/second| Seed |
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stdin_input_raw| 1.86e+05 |2067533949|
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#=============================================================================#
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test_name |ntup| tsamples |psamples| p-value |Assessment
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#=============================================================================#
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diehard_birthdays| 0| 100| 100|0.11286983| PASSED
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diehard_operm5| 0| 1000000| 100|0.14228207| PASSED
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diehard_rank_32x32| 0| 40000| 100|0.08372938| PASSED
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diehard_rank_6x8| 0| 100000| 100|0.47630577| PASSED
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diehard_bitstream| 0| 2097152| 100|0.68878582| PASSED
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diehard_opso| 0| 2097152| 100|0.36965490| PASSED
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diehard_oqso| 0| 2097152| 100|0.85360068| PASSED
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diehard_dna| 0| 2097152| 100|0.41389081| PASSED
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diehard_count_1s_str| 0| 256000| 100|0.64198483| PASSED
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diehard_count_1s_byt| 0| 256000| 100|0.48126427| PASSED
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diehard_parking_lot| 0| 12000| 100|0.61281762| PASSED
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diehard_2dsphere| 2| 8000| 100|0.98794548| PASSED
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diehard_3dsphere| 3| 4000| 100|0.86553337| PASSED
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diehard_squeeze| 0| 100000| 100|0.47837267| PASSED
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diehard_sums| 0| 100| 100|0.26661852| PASSED
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diehard_runs| 0| 100000| 100|0.78455791| PASSED
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diehard_runs| 0| 100000| 100|0.56428921| PASSED
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diehard_craps| 0| 200000| 100|0.81900152| PASSED
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diehard_craps| 0| 200000| 100|0.54592338| PASSED
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ctrl-c
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dd if=/dev/sda4 of=/dev/stdout | ./stream 1 e | dieharder -a -g 200
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#=============================================================================#
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# dieharder version 3.31.1 Copyright 2003 Robert G. Brown #
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#=============================================================================#
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rng_name |rands/second| Seed |
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stdin_input_raw| 1.86e+05 |2067533949|
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#=============================================================================#
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test_name |ntup| tsamples |psamples| p-value |Assessment
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#=============================================================================#
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diehard_birthdays| 0| 100| 100|0.11286983| PASSED
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diehard_operm5| 0| 1000000| 100|0.14228207| PASSED
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diehard_rank_32x32| 0| 40000| 100|0.08372938| PASSED
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diehard_rank_6x8| 0| 100000| 100|0.47630577| PASSED
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diehard_bitstream| 0| 2097152| 100|0.68878582| PASSED
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diehard_opso| 0| 2097152| 100|0.36965490| PASSED
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diehard_oqso| 0| 2097152| 100|0.85360068| PASSED
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diehard_dna| 0| 2097152| 100|0.41389081| PASSED
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diehard_count_1s_str| 0| 256000| 100|0.64198483| PASSED
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diehard_count_1s_byt| 0| 256000| 100|0.48126427| PASSED
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diehard_parking_lot| 0| 12000| 100|0.61281762| PASSED
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diehard_2dsphere| 2| 8000| 100|0.98794548| PASSED
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diehard_3dsphere| 3| 4000| 100|0.86553337| PASSED
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diehard_squeeze| 0| 100000| 100|0.47837267| PASSED
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diehard_sums| 0| 100| 100|0.26661852| PASSED
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diehard_runs| 0| 100000| 100|0.78455791| PASSED
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diehard_runs| 0| 100000| 100|0.56428921| PASSED
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diehard_craps| 0| 200000| 100|0.81900152| PASSED
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diehard_craps| 0| 200000| 100|0.54592338| PASSED
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ctrl-c
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(FIXME: I aborted here, I'll repeat that one later)
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