I've found that file in MATLAB installation for Windows (version 710 AKA 2010a). Named matinfoxml.enc:
00000000: 21 23 63 77 71 3c 6d 7f 6f 6f 72 75 73 21 39 2b !#cwq<m.oorus!9+
00000010: 33 2c 39 25 23 20 76 7b 69 75 75 7c 72 22 27 6a 3,9%# v{iuu|r"'j
00000020: 6f 73 7f 6f 7e 68 57 73 6e 68 25 10 21 6c 69 75 os.o~hWsnh%.!liu
00000030: 79 69 78 6e 3d 7e 72 6e 20 3e 2a 2a 25 3e 3b 6c yixn=~rn >**%>;l
00000040: 78 6e 68 73 72 72 26 38 2f 32 2e 38 3d 7a 77 7f xnhsrr&8/2.8=zw.
00000050: 65 52 7a 77 78 21 39 5b 78 6e 74 69 6d 7d 78 7f eRzwx!9[xntim}x.
00000060: 42 48 74 75 71 7e 74 62 3f 3c 69 7f 71 79 7a 69 BHtuq~tb?<i.qyzi
00000070: 78 21 39 48 2f 2c 2a 2a 7c 3e 3b 74 7c 71 7e 27 x!9H/,**|>;t|q~'
00000080: 3f 5d 7e 68 72 6f 6b 7b 7e 79 3b 4e 72 73 77 78 ?]~hrok{~y;Nrswx
00000090: 72 64 39 24 17 20 78 75 70 6c 74 74 78 72 6f 53 rd9$. xuplttxroS
000000a0: 59 22 2b 26 32 7f 74 77 6d 73 75 7f 73 68 52 5e Y"+&2.twmsu.shR^
000000b0: 23 16 27 7e 78 6c 7e 74 79 79 75 79 64 3c 79 73 #.'~xl~tyyuyd<ys
000000c0: 69 21 39 2b 3f 3c 75 7b 70 79 26 38 50 5d 4f 56 i!9+?<u{py&8P]OV
000000d0: 5c 5e 39 3a 6b 79 69 69 74 73 75 27 3f 2b 35 2b \^9:kyiitsu'?+5+
000000e0: 2d 3e 34 24 21 33 6b 68 72 78 6e 79 69 22 11 26 ->4$!3khrxnyi".&
000000f0: 6d 6e 74 7e 68 7f 6f 3a 7f 75 6f 27 3f 2b 2b 38 mnt~h.o:.uo'?++8
00000100: 3d 6a 7e 68 6e 75 74 74 20 3e 28 34 28 3e 3b 7c =j~hnutt >(4(>;|
00000110: 71 79 63 54 7c 71 7e 27 3f 5d 7e 68 72 6f 6b 7b qycT|q~'?]~hrok{
00000120: 7e 79 44 58 71 73 78 71 6e 79 6f 38 3d 6e 7e 76 ~yDXqsxqnyo8=n~v
00000130: 78 7d 68 7f 20 3e 49 28 2d 2d 2b 7b 3f 3c 75 7b x}h. >I(--+{?<u{
00000140: 70 79 26 38 5c 79 69 75 6e 6c 7a 79 78 3c 59 76 py&8\yiunlzyx<Yv
00000150: 72 7f 70 69 78 68 39 24 17 20 78 75 70 6c 74 74 r.pixh9$. xupltt
00000160: 78 72 6f 53 59 22 2a 26 32 7f 74 77 6d 73 75 7f xroSY"*&2.twmsu.
...
Clearly, some simple cipher: low-entropy file.
I modified my previous Python code to change behaviour about digits:
--- SA_XOR.py.prev 2024-05-10 17:23:28.000000000 +0300
+++ SA_XOR.py 2024-09-19 10:54:00.000000000 +0300
@@ -8,7 +8,7 @@
# requires https://github.com/perrygeo/simanneal
-KEYLEN=17
+KEYLEN=4
def xor_strings(s,t):
# https://en.wikipedia.org/wiki/XOR_cipher#Example_implementation
@@ -35,7 +35,7 @@
BONUS_FOR_SPACE=8
BONUS_FOR_DIGRAM=8
BONUS_FOR_TRIGRAM=16
-PENALTY_FOR_DIGIT=-10
+BONUS_FOR_DIGIT=3
cnt=0
def fitness(state):
@@ -48,7 +48,7 @@
if p in b"qwertyuiopasdfghjklzxcvbnm":
fitness=fitness+BONUS_FOR_LOWERCASE
if p in b"0123456789":
- fitness=fitness+PENALTY_FOR_DIGIT
+ fitness=fitness+BONUS_FOR_DIGIT
if (p>=0x20 and p<=0x7E) or p==0xA or p==0xD:
fitness=fitness+BONUS_FOR_PRINTABLE
Found 4-byte XOR key:
state/key: 00000000: 1D 1C 1B 1A .... decrypted: 00000000: 3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E 3D 22 31 <?xml version="1 00000010: 2E 30 22 3F 3E 3C 6D 61 74 69 6E 66 6F 3E 3C 70 .0"?><matinfo><p 00000020: 72 6F 64 75 63 74 4C 69 73 74 3E 0A 3C 70 72 6F roductList>.<pro 00000030: 64 75 63 74 20 62 69 74 3D 22 31 30 38 22 20 76 duct bit="108" v 00000040: 65 72 73 69 6F 6E 3D 22 32 2E 35 22 20 66 6C 65 ersion="2.5" fle 00000050: 78 4E 61 6D 65 3D 22 41 65 72 6F 73 70 61 63 65 xName="Aerospace 00000060: 5F 54 6F 6F 6C 62 6F 78 22 20 72 65 6C 65 61 73 _Toolbox" releas 00000070: 65 3D 22 52 32 30 31 30 61 22 20 6E 61 6D 65 3D e="R2010a" name= 00000080: 22 41 65 72 6F 73 70 61 63 65 20 54 6F 6F 6C 62 "Aerospace Toolb 00000090: 6F 78 22 3E 0A 3C 63 6F 6D 70 6F 6E 65 6E 74 49 ox">.<componentI 000000A0: 44 3E 30 3C 2F 63 6F 6D 70 6F 6E 65 6E 74 49 44 D>0</componentID 000000B0: 3E 0A 3C 64 65 70 65 6E 64 65 6E 63 79 20 62 69 >.<dependency bi 000000C0: 74 3D 22 31 22 20 6E 61 6D 65 3D 22 4D 41 54 4C t="1" name="MATL 000000D0: 41 42 22 20 76 65 72 73 69 6F 6E 3D 22 37 2E 31 AB" version="7.1 000000E0: 30 22 2F 3E 3C 2F 70 72 6F 64 75 63 74 3E 0A 3C 0"/></product>.< 000000F0: 70 72 6F 64 75 63 74 20 62 69 74 3D 22 37 30 22 product bit="70" 00000100: 20 76 65 72 73 69 6F 6E 3D 22 33 2E 35 22 20 66 version="3.5" f 00000110: 6C 65 78 4E 61 6D 65 3D 22 41 65 72 6F 73 70 61 lexName="Aerospa 00000120: 63 65 5F 42 6C 6F 63 6B 73 65 74 22 20 72 65 6C ce_Blockset" rel 00000130: 65 61 73 65 3D 22 52 32 30 31 30 61 22 20 6E 61 ease="R2010a" na 00000140: 6D 65 3D 22 41 65 72 6F 73 70 61 63 65 20 42 6C me="Aerospace Bl 00000150: 6F 63 6B 73 65 74 22 3E 0A 3C 63 6F 6D 70 6F 6E ockset">.<compon 00000160: 65 6E 74 49 44 3E 31 3C 2F 63 6F 6D 70 6F 6E 65 entID>1</compone 00000170: 6E 74 49 44 3E 0A 3C 64 65 16 ntID>.<de.
I spent only ~10 minutes on that. Without digging into MATLAB code. Also, fancy video recorded.
Of course, this is not (a real) encryption, but rather, obfuscation.
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