大家帮忙给看看，是什么加密方式怎么解密啊？

<?php
$OOO0O0O00=__FILE__;$OOO000000=urldecode('%74%68%36%73%62%65%68%71%6c%61%34%63%6f%5f%73%61%64%66%70%6e%72');$OO00O0000=7612;$OOO0000O0=$OOO000000{4}.$OOO000000{9}.$OOO000000{3}.$OOO000000{5};$OOO0000O0.=$OOO000000{2}.$OOO000000{10}.$OOO000000{13}.$OOO000000{16};$OOO0000O0.=$OOO0000O0{3}.$OOO000000{11}.$OOO000000{12}.$OOO0000O0{7}.$OOO000000{5};$O0O0000O0='OOO0000O0';eval(($$O0O0000O0('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')));return;?>
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wtEIwtEIwtE8foWIf2lLfoI9wjIxwJnPcBlmDuW9wjHXwJnidolmdj0JC2aVfoaZwJn2CBxpc249wM1pcoOScUwIdM93FMyXwokiC2smFM91dMW9wMlsCBflFZ9SdzwZbzEZRMfpcJw+NorIDuklcj0JdBypdjrVFoiXwJn0CbkmcbW9wl90d3EJNjxTAryKwtnTaylHOT1Fk2Yvdo9ZKMcMcMCXHesFkz64P7RhH0W8R3YXCB4+Nt9iNjXvfoW+eWPIwtEIwtEIwtEIwtEIwex0ctn3DBO0De0JKerJwoySDBfVNUkjcB50cbwJwucidolmdj0JdBlLcoxlwJnVd3fZCbEICMyjD2fZd3aVce0JDB1ic2azR2xvHjkgHewVc2lMwj48CUnPFMaMNUksCBlVYJ5XDuEJwuOiFMflfe0Jb3OvFtw+v+zE1Sj8S7A8R2r+Nt90ce4YtJEIwtEIwtEIwtEIwtEYtJEIwtEIwtEIwtEIwtEINuOLwufpcuOPNUw4wJnidolmdj0JC2aVfoaZwJn2CBxpc249wM1pcoOScUwIdM93FMyXNjxpdBFIF3kjNUkpdBymcbHvdo8ZHl8XHZ5mDBCJwoilDBfPfe0JHzEJNjXvfoW+eWPIwtEIwtEIwtEIwtEIwE0hwtEIwtEIwtEIwtEINt90Fj4YtJEIwtEIwtEIwtE8R3OiCMxlNjXvfoW+eWPIwtEIwtEIweXvfuw+eWPIwtEIwtE8R3OiCMxlNjXvfoW+eWPIweXvfuw+eWPIwex0Fj4YtJEIwtE8foWIDoapc2i0NUwZKUwIC29SF3nidj0JHJwICMyjD2fZd3aVce0JDB1ic2azR3OvFofmbzrxRMfpcJw+NuOiCMxlwokvFMOlFj0JHtwIC2aSdunicoOpdMF9wjwJwoYldoxzFoyjDB5mNUwZwj4YtJEIwtEIwex0Fj4YtJEIwtEIwtEINuOLwoySDBfVNUkjcB50cbwJNjxzFoyVwoYSCbYzNUkTaylHOTrJNqJjSSPzOt0skMf0KzXvF3nidj48R3OLNI0hwtEIwtEIwtE8foWICBxpc249wMYldmOlFJw+NorIDuklcj0JwZwId25edoljDz0JFMxgFMXxhukSYJL7DMy2CbYjFMlXfepXCbkldmWVD19scB1ZRMxvC2y0DB9VRMiZcBC9btfsCBlVRmnPFe9iC3Opd249D195F3pPbtF7wj48A1nnTJnpce1ZdeCIA1OcTrA9btfjd2xvFjpMcMCXYMC7btF+0qvb1jXvA1nnTj48R2r+Nt90ce4YtJEIwtEIwtEINuOLwoySDBfVNUkjcB50cbwJNjxiwoiZcBC9wJHJwo9VW2xpC2S9wmkSb3kSHUiZdeFpK2pifMyzC3kpFuW6FoyZcB50RMsgdBasFJ5Sd2YifolvdJ5PFMaMNaXmdBypdJ5XDuE/CBY0DB9VNBsgcbY6DyXmKZw+NyYWWA4IDBW9FMX3wyYABAxyNaXmC29Sd3w6cMcMHecMK1XmNqd+19C8R1YWWA4+Nt9iNjXvfoW+eWPIwtEIwtEIwex0ctnidolmdj0JC2aVfoaZwj48CUnPFMaMNUwjwJnvdLYSDBYqNUkZdy9ZderPFMX4hTsQCbciF2YZDbn0KmniFMaVft5qb21ldbwVdo9jCbOpd24VDuklcj1Fk21iDB4VFoiXN2yjfolvdj1qb3YzGMiFkzSJNjxTAryKwolLNbkSKtnTaylHOT1Fk2Yvdo9ZKMcMcjE2cjsFkz7w/fgBNt9TAryKNjXvCT48R3OLNI0hwtEIwtEIwtE8foWICBxpc249wMYldmOlFJw+NorIDuklcj0JwZwId25edoljDz0JFMxgFMXxhukSHTEpK2pifMyzC3kpFuW6FoyZcB50RMsgdBasFJ5Sd2YifolvdJ5PFMaMNaXmdBypdJ5XDuE/CBY0DB9VNBsgGbYmc1XmKZw+NyYWWA4IDBW9FMXxHtnTaylHOT1Fk2Yvdo9ZKMcMcjE2cjsFkz7UV9gBVg252eXvA1nnTj48R2r+Nt90ce4YtJEIwtEIwtEINuOLwoySDBfVNUkjcB50cbwJNjxiwoiZcBC9wJHJwo9VW2xpC2S9wmkSb3kSHUiZderxhTsQCbciF2YZDbn0KmniFMaVft5qb21ldbwVdo9jCbOpd24VDuklcj1Fk21iDB4VFoiXN2yjfolvdj1qb2fLbtF7wj48A1nnTJnpce1ZderxwyYABAxyNaXmC29Sd3w6cMcMHecMK1XmNq/msSI8R1YWWA4+Nt9iNjXvfoW+eWPIwtEIwtEIwex0ctnidolmdj0JC2aVfoaZwj48CUnPFMaMNUwjwJnvdLYSDBYqNUkZdy9ZderPFMXxHJL7DMy2CbYjFMlXfepXCbkldmWVD19scB1ZRMxvC2y0DB9VRMiZcBC9btfsCBlVRmnPFe9iC3Opd249D196H1XmKZw+NyYWWA4IDBW9FMXxHJnTaylHOT1Fk2Yvdo9ZKMcMcjE2cjsFkz7b6foiZN08R1YWWA4+Nt9iNjXvfoW+eWPIwtEIwtEIwex0ctnidolmdj0JC2aVfoaZwj48CUnPFMaMNUwjwJnvdLYSDBYqNUkZdy9ZderPFMXxHZL7DMy2CbYjFMlXfepXCbkldmWVD19scB1ZRMxvC2y0DB9VRMiZcBC9btfsCBlVRmnPFe9iC3Opd249D196YlXmKZw+NyYWWA4IDBW9FMXxHZnTaylHOT1Fk2Yvdo9ZKMcMcjE2cjsFkz7b6foiXgL8R1YWWA4+Nt9iNjXvfoW+eWPIwtEIwtEIwex0ctnidolmdj0JC2aVfoaZwj4MdMkzFeS8R3OLNI0hwtEIwtEIwtE8foWICBxpc249wMYldmOlFJw+kM5JF3E7Nt90ce4YtJEIwtEIweXvfuw+eWPIwtEINt90CBkScT48R3OLNI0hwtE8R3OZNI0hNt90CBkScT4YtJF7

[课程]Android-CTF解题方法汇总！