PHP encryption method and principle _php skills

Source: Internet
Author: User
Tags fread
Copy Code code as follows:

<?php
The variable note distinguishes between the number "0" and the character "O"
$OOO 000000=urldecode ('%66%67%36%73%62%65%68%70%72%61%34%63%6f%5f%74%6e%64 ');
Decodes the encoded URL string, decoding the result is Fg6sbehpra4co_tnd
$OOO 0000o0= $OOO 000000{4}. $OOO 000000{9}. $OOO 000000{3}. $OOO 000000{5};
The decoded characters are then obtained from the values in the 4, 9, 3, and 5 respectively and are connected together, resulting in base.
And the final result is base64_decode.
$OOO 0000o0.= $OOO 000000{2}. $OOO 000000{10}. $OOO 000000{13}. $OOO 000000{16};
$OOO 0000o0.= $OOO 0000o0{3}. $OOO 000000{11}. $OOO 000000{12}. $OOO 0000o0{7}; $OOO 000000{5};
?>

Copy Code code as follows:

<?php eval ($GLOBALS [' Ooo0000o0 '] (' jeljsuljsuljsuljst0nagvhzgvyjzsksuljsuljsuljbdexpsdpc19mawxljzs= '));
$GLOBALS A variable that has already been defined, $GLOBALS [' ooo0000o0 '] value is Base64_decode, and then decodes the string with it, resulting in $IIIIIIIIIIII = ' header '; $IIIIIIIIIl 11 = ' Is_file '; Eval executes the extracted string and gets the corresponding variable
?>

Copy Code code as follows:

<?php/* * *
$OOO 000o00= $OOO 000000{0}. $OOO 000000{12}. $OOO 000000{7}. $OOO 000000{5}; $OOO 000000{15};
Ditto to be $OOO 000o00 = ' fopen '
$O 0o000o00= $OOO 000000{0}. $OOO 000000{1}. $OOO 000000{5}. $OOO 000000{14};
$O 0o000o00 = ' Fget '
$O 0o000o0o= $O 0o000o00. $OOO 000000{11};
$O 0o000o0o = ' fgetc '
$O 0o000o00= $O 0o000o00. $OOO 000000{3};
$O 0o000o00 = ' fgets '
$O 0o00oo00= $OOO 000000{0}. $OOO 000000{8}. $OOO 000000{5}. $OOO 000000{9}; $OOO 000000{16};
$O 0o00oo00 = ' fread '
$OOO 00000o= $OOO 000000{3}. $OOO 000000{14}. $OOO 000000{8}. $OOO 000000{14}; $OOO 000000{8};
$OOO 00000O = ' Strtr '
$OOO 0o0o00=__file__;
Get the current file path and file name
$OO 00o0000=0x100;

Eval ($OOO 0000o0 (' Je8wmdbpme8wmd0kt09pmdawtzawkcrpt08wtzbpmdasj3jijyk7je8wtzawt08wmcgktzawme8wtzawldb4nti2ktskt08wme8wme8wpsrpt08wmdawtzaoj E9ptzawmdawtygktzbpmdbptzawkcrpmdawtzbpmdasmhgxn2mplcdaqnhmykztqzyybhbja1hqywryr1viotrln1fouzvwdljxenlpl2dpmefuwu1ecxrvzk Vjdstoztnqd0oxog5zpscsj0fcq0rfrkdisuplte1ot1brulnuvvzxwflaywjjzgvmz2hpamtsbw5vchfyc3r1dnd4exowmtizndu2nzg5ky8nksk7zxzhbcg Kt08wme8wme8wkts= '));
/* The result of the solution is
$O 000o0o00= $OOO 000o00 ($OOO 0o0o00, ' RB '); $O 0o00oo00 ($O 000o0o00,0x526); $OO 00o00o0= $OOO 0000o0 ($OOO 00000O ($ o0o00oo00 ($O 000o0o00,0x17c), ' zbxlbfmc62lpckxpadrguh94k7qns5vvrwzyi/go0atymdqtofeiu+he3jwj18ns= ', ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/')); eval ($OO 00o00o0);

Restored and equivalent substitution available
$FP =fopen (__file__, ' RB ');
Fread ($fp, 0x526);
$buf = Fread ($fp, 0x17c);
$str =base64_decode (strtr $buf, ' zbxlbfmc62lpckxpadrguh94k7qns5vvrwzyi/go0atymdqtofeiu+he3jwj18ns= ', ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/'));
eval ($STR);
*/
return to;? >eu~fq\frcggpg@lo ' oq2b8pclbpclbpcl+i5c2vsghonmfy7rro4+8mruff4+ 1opx6o6z3igu8pcb1ogizopz6o6zoigu8pclzocb1olxdpgu1oclzocb102b1ogizogu1ocxrigizocb1ogizopxdpgizogizoclzapx5qaowcki7daikencb yq+wak9ded+h6xgdpk+fxuih95/24vo/aph5pcbfu9u+bs4dt7ih25rd07gkt5u0fxmjiprsm2ufxaudfdi56ruapgb+xg+bdu/kuhh749f/ qk92y7mhg7hwaqgdmn9jtscfesed+5o53v40ocg6ikluhkirjle1olriaxh7ynm8i7rrigizocb1ogizolgd/5gfmlxdpgizogizogizaxo== xzd2ru/2ru/2ru/mc9orprzidufpaifcu+moru/2ru/2ru/2nlbf2+u02hfakz8ynhjgq9sqsmwo2eijxg/g6xriru/2ru/2ru/ 2nlfm6lu8prbusoh/laaj2b5cgu2bgfkn2u/2ru/2ru/2ru/2rr55lx2cnhkw5m/tny0rqxjoqczzlgd8xghmshulvedcgb8xaufg9e52ru/ 2ru/2ru/2ruio4rrzgm8yk4danh3w6m/qsedwnmozlgd8xr==klhgjcz[zm

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