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SortedbyUsingPDFBox(basedoncode):PDDocumentdocument=null;try*ryptthisstringwiththeinternalalgorithmToopenasecureddocument,call curityHandler().Asalways,thefullsourcecodeofthearticleisavailableoveronGitHubAESisasymmetric-keyalgorithmthatusestheContents.ChangeHow toEncryptorryptaFileinJava?Askedyears,monthsagoViewedktimesHereIamdisplayingthefileinAndroiddevicebutafterryptingthefile,howcanI displayit?WecanencryptanyPDFusingJavabyusingtheexternallibraryPDFBoxInthistutorial,we’lltakealookonhowtoencryptandryptafileusing existingJDKAPIsWritingaTestFirstCode:FilepdfFile=newFile(ernalStorageDirectory()+"/SampleFolder/"+"Sample"ing(NAME));Filef=new File(ng());ChangeSECRETKEY1andSECRETKEY2toyourownsecretkeysAESisasymmetric-keyalgorithmthatusesthesamekeyforboth encryptionandryptionofdataBasicStepsToopenadocumentwithaThistutorialshowsyouhowtobasicallyencryptandryptfilesusingtheAdvanced EncryptionStandard(AES)algorithm.*@returnreturnsencryptedstring.n("Securinganexistingdocument");try(PDFDocdoc=newPDFDoc((inputpath+" "))){HowtoEncryptPDFfilesusingFoxitPDFSDK(Java)FoxitPDFSDKprovidesarangeofencryptionandryptionfunctionstomeetdifferentlevelsof documentsecurityprotectionryptPDFFileusingOwnerPasswordBaseencodingschemesarecommonlyusedwhenthereisaneedtoencodebinarydata, EncryptPDFusingJavaTosecureadocument,usetheurityHandler()method*Encryptthestringwiththisinternalalgorithm*@paramtoBeEncryptstring objecttobeencryptWe’llstartbywritingourtest,TDDstyle[Hide]SetPrivilegesonanExistingPDFFileThepassedargumentshouldbeencryptedusing importtputStream;importryptor;importder;importmper;importcomMeetBaseodeandEncode,asimpleonlinetoolthatdoesexactlywhatitsays:odesfrom BaseencodingaswellasencodesintoitquicklyandeasilyAdditionally,wediscussedtheAESvariationsandthesizeofdataafterencryption{document= (infile);if(ypted()){ryptionMaterialryptionMaterial=null;ryptionMaterial=newStandardryptionMaterial(password);otection(ryptionMaterial);Overview. Userscanuseregularpasswordencryptionandcertificate-drivenencryption,orusetheirownsecurityhandlerforcustomsecurityimplementationThistutorial showsyouhowtobasicallyencryptandryptfilesusingtheAdvancedEncryptionStandard(AES)algorithmEncryptPDFFileusingDifferentEncryptionTypes andAlgorithmsHerearethegeneralstepstoencrypt/ryptafileinJavaInthisarticle,welearnedhowtoencryptandryptinputdatalikestrings,files,objects,and password-baseddatausingtheAESalgorithminJavaSincewe’regoingtoworkwithfileshere,anintegrationtestseemstobeappropriateTorunthefunction, wefirstneedtoinstallourlibrarywithMavenbyaddingaJitpackreferencetotherepositoryin:xThen,wecanaddareferencetothedependencyString inputpath="//TestFiles/";Stringoutputpath="//TestFiles/Output/";//Example//secureadocumentwithpasswordprotectionand//adjustpermissions// OpenthetestfileSystem.Modifiedyears,monthsago.EncryptionApproach:ByusingthePDFBoxlibrary,youwillseehowyoucanencryptthePDFfile3 AnswersBaseencodeyourdatawithouthasslesorodeitintoahuman-readableformatInsidePDFBoxlibraryclassesareavailableStandardProtectionPolicyand AccessPermissionClass