PHP encryption methods and principles_PHP tutorial

Copy code The code is as follows:

//For variables, please distinguish between the number "0" and the character "O"
$OOO000000=urldecode('%66%67%36%73%62%65%68%70%72%61%34%63%6f%5f%74%6e%64');
/ / Decode the encoded URL string, the decoding result is fg6sbehpra4co_tnd
$OOO0000O0=$OOO000000{4}.$OOO000000{9}.$OOO000000{3}.$OOO000000{5};
//Then The decoded characters obtain the values ​​​​in 4, 9, 3, and 5 respectively and concatenate them together, and the result is base.
//The same below, the final result is base64_decode
$OOO0000O0.=$OOO000000{2}.$OOO000000{10}.$OOO000000{13}.$OOO000000{16};
$OOO0000O0. =$OOO0000O0{3}.$OOO000000{11}.$OOO000000{12}.$OOO0000O0{7}.$OOO000000{5};
?>

Copy code The code is as follows:

/ / $GLOBALS has been defined variables, the value of $GLOBALS['OOO0000O0'] is base64_decode, and then uses it to decode the following string, the result is $IIIIIIIIIIII='header';$IIIIIIIIIl11='is_file'; eval executes the decoded characters string, and get the corresponding variable
?>

Copy the code The code is as follows:

$OOO000O00=$OOO000000{0}.$OOO000000{12}.$OOO000000{7}.$OOO000000{5}.$OOO000000{15};
// Same as above to get $OOO000O00 = 'fopen'
$O0O000O00=$OOO000000{0}.$OOO000000{1}.$OOO000000{5}.$OOO000000{14};
// $O0O000O00 = 'fget'
$O0O000O0O=$O0O000O00.$OOO000000{11};
// $O0O000O0O = 'fgetc'
$O0O000O00=$O0O000O00.$OOO000000{3};
// $O0O000O 00 = ' fgets'
$O0O00OO00=$OOO000000{0}.$OOO000000{8}.$OOO000000{5}.$OOO000000{9}.$OOO000000{16};
// $O0O00OO00 = 'fread'
$OOO00000O=$OOO000000{3}.$OOO000000{14}.$OOO000000{8}.$OOO000000{14}.$OOO000000{8};
// $OOO00000O = 'strtr'
$ OOO0O0O00=__FILE__;
//Get the current file path and file name
$OO00O0000=0x100; zAwT08wMCgkTzAwME8wTzAwLDB4NTI2KTskT08wME8wME8wPSRPT08wMDAwTzAoJE9PTzAwMDAwTygkTzBPMDBPTzAwKCRPMDAwTzBPMDAsMHgxN2MpLCdaQnhMYkZtQzYybHBja1hQYWRyR1VIOTRLN1 FOUzVWdlJXenlpL2dPMEFUWU1EcXRvZkVJdStoZTNqd0oxOG5zPScsJ0FCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaYWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU2Nzg5Ky8nKSk7ZXZhb CgkT08wME8wME8wKTs='));
/* solved The result is
$O000O0O00=$OOO000O00($OOO0O0O00,'rb');$O0O00OO00($O000O0O00,0x526);$OO00O00O0=$OOO0000O0($OOO00000O($O0O00OO00($O000O0O00 ,0x17c),'ZBxLbFmC62lpckXPadrGUH94K7QNS5VvRWzyi/gO0ATYMDqtofEIu +he3jwJ18ns=','ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'));eval($OO00O00O0);

Restore and replace with equivalents to get
$fp=fopen(__FILE__,'rb');
fread ($fp,0x526); JKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/')) ; Eval ($ Str);
*/
Return;? & GT; EU ~ FQFRCGGPG@Lo`OQ2B8pClbpCl+I5C2VSGHONMFY7RRRRO4+8MRUFF4+1opX66Z3IGU8PC B1OGIZOPZ6ZOGU8PCLZOCB1OLXDPGU1OCLZOCB102B1OGIZOCXRIGIZOGIZDPGIZAPX5qao7Daikencbyq+Wak9ded+H6XGDP K+FXUIH95/24VO/APH5PCBFU9U+BS4DT7IH25RD07GKT5U0FXMJIPRSM2UFXAUDFDI56RUAPGB+XG +BdU/kUHH749F/QK92y7mHg7hWAQgDMN9jtSCFESed+5O53V40ocG6IkLUhkIRjlE1OlriAXh7yNm8I7rRiGIZocb1oGIZolGD/5gFMlxdPGIZoGIZoGIZAXo==xzd2rU/2rU/2rU/Mc9oRPrZ idufPaiFcU+MOrU/2rU/2rU/2NLbf2+u02hfAKz8yNhjgQ9SqSmWo2EiJxg/g6xRirU/2r U/2rU/2NLFM6Lu8PrBuSOH/laAJ2b5cGu2BGFkN2u/2rU/2rU/2rU/2rr55lx2cNhkW5m/ tNy0RQxjoQCZzlGD8xgHMShUlVEdCGb8xaUfG9E52rU/ 2rU/2rU/2rUiO4rRzGm8yK4dANh3w6m/qSedWNmozlGD8xR==kLHg JcZ[ZM





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truehttp: //www.bkjia.com/PHPjc/325549.htmlTechArticleCopy the code code as follows: ?php //Variables, please distinguish between the number "0" and the character "O" $OOO000000= urldecode('%66%67%36%73%62%65%68%70%72%61%34%63%6f%5f%74%6e%64'); // Decode encoded URL characters.. .