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2015-10-03 16:16:39 +02:00
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@@ -71,87 +71,7 @@ I encrypted the GPLv3 contents using the key "1". To compare,
I encrypted the same file with AES-256-CBC using the same
passphrase.
### Check using analyze.c
My own measurement, see analyze.c:
File size: 10240000 bytes
Char distribution: 99.609375%
Char redundancy: 0.390625%
Char entropy: 7.999984 bits/char
Compression rate: 0.000000% (10240000 => 10243131 bytes)
For comparision, AES result:
File size: 35168 bytes
Char distribution: 100.000000%
Char redundancy: 0.000000%
Char entropy: 7.994892 bits/char
Compression rate: 0.000000% (35168 => 35189 bytes)
## Check using ent
(ent from http://www.fourmilab.ch/random/):
Entropy = 7.999984 bits per byte.
Optimum compression would reduce the size
of this 10240000 byte file by 0 percent.
Chi square distribution for 10240000 samples is 221.67, and randomly
would exceed this value 93.52 percent of the times.
Arithmetic mean value of data bytes is 127.4901 (127.5 = random).
Monte Carlo value for Pi is 3.142712165 (error 0.04 percent).
Serial correlation coefficient is -0.000012 (totally uncorrelated = 0.0).
For comparision, AES result:
Entropy = 7.994892 bits per byte.
Optimum compression would reduce the size
of this 35168 byte file by 0 percent.
Chi square distribution for 35168 samples is 250.98, and randomly
would exceed this value 55.94 percent of the times.
Arithmetic mean value of data bytes is 127.8717 (127.5 = random).
Monte Carlo value for Pi is 3.151680601 (error 0.32 percent).
Serial correlation coefficient is 0.002014 (totally uncorrelated = 0.0).
## Check using dieharder
I ran the cipher against the dieharder test suite this way:
dd if=/dev/zero of=/dev/stdout | ./twenty4 00000000000000000001 | dieharder -g 200 -a
Find the results in analyze/dieharder160.log
## Output test
- same clear text slightly different key
IN: 111111111111, KEY: 00000000000000000001, NONCE: 1, OUT: 8201 cedd ec74 f55b f6a8 a7eb
IN: 111111111111, KEY: 00000000000000000002, NONCE: 2, OUT: 964d 0939 cf94 a158 a259 ff4e
IN: 111111111111, KEY: 00000000000000000003, NONCE: 3, OUT: db9a 4e08 9ac8 3297 6457 b8aa
IN: 111111111111, KEY: 00000000000000000004, NONCE: 4, OUT: 4946 2ce3 fd4a f4e8 95aa 985a
IN: 111111111111, KEY: 00000000000000000005, NONCE: 5, OUT: 5f5f 4eaf c0d2 4363 9b18 2eb4
IN: 111111111111, KEY: 00000000000000000006, NONCE: 6, OUT: e8df deb7 2afe 3783 98d6 8c3f
IN: 111111111111, KEY: 00000000000000000007, NONCE: 7, OUT: 6e3a 27d5 06ed eeca ad3b e7c0
IN: 111111111111, KEY: 00000000000000000008, NONCE: 8, OUT: 1c31 4f9b 58d4 1cbd c0cd 0885
- same key, slightly different clear text
IN: 111111111111, KEY: 00000000000000000001, NONCE: 1, OUT: 8201 cedd ec74 f55b f6a8 a7eb
IN: 111111111112, KEY: 00000000000000000001, NONCE: 2, OUT: 031c 6a54 b299 dcc1 5726 57e4
IN: 111111111113, KEY: 00000000000000000001, NONCE: 3, OUT: cd12 a615 1ce0 6b95 3ca8 d4b7
IN: 111111111114, KEY: 00000000000000000001, NONCE: 4, OUT: 4a6e a49f e68b 4fe7 61ac 4642
IN: 111111111115, KEY: 00000000000000000001, NONCE: 5, OUT: 999f 44a0 f563 1c06 64d1 e710
IN: 111111111116, KEY: 00000000000000000001, NONCE: 6, OUT: 92d0 e5e0 67c4 0076 c3d7 4130
IN: 111111111117, KEY: 00000000000000000001, NONCE: 7, OUT: f6c2 59fd bdd0 2298 9975 3757
IN: 111111111118, KEY: 00000000000000000001, NONCE: 8, OUT: 830b 63d4 15f9 fb41 3cd3 0c62
For results look in analyze/TESTLOG.md.
So, all those checks don't look that bad, but of course this doesn't
say much about TWENTY4/160's security. However, not THAT bad for the first cipher :)