java barcode reader source code Run the jadtool and add the public key of your signing certificate into in Android

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4 Run the jadtool and add the public key of your signing certificate into
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MyApp s JAD file using the following command:
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jadtool -addcert -alias SigKey -keystore c:\drop\keystore -inputjad myappjad -outputjad myapp-keyjad
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5 This command refers to the key that was created earlier, so make sure that the
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key alias and keystore file path match up After running this command, you can open the generated myapp-keyjad file and see that the MIDlet-Certificate-1-1 attribute has been added
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6 Now sign the application with this command:
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jadtool -addjarsig -alias SigKey -keystore c:\drop\keystore -inputjad myapp-certjad -outputjad myapp-signedjad -storepass password -keypass password -jarfile myappjar
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7 You will need to substitute the appropriate password values for the storepass
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and keypass parameters and make sure that the filenames point to your actual application Both keystore management and signing can be performed using the NetBeans IDE To manage keystores, use Tools | Keystore To control signing, right-click on a project, open the Properties panel, and select the Build\Signing category
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How JME applications are distributed varies by device and network Almost every carrier has some sort of application store that is accessible via the phone However, there are many other websites that offer JME applications, and unlike with the iPhone, users are not locked in to getting applications from just their carrier Naturally, this increases the risk of users being tricked into installing malicious applications from questionable sources
6: Java Mobile Edition Security
Installation
All MIDP 20 devices must support Over-The-Air (OTA) application installation Of course, the implementation will vary between vendors, but they all follow the same pattern To install an application OTA, the user visits a website and downloads the JAD file The device parses the file and displays the application s information to the user At this point, the user must be presented with an option of canceling installation If the user chooses to proceed, the device will download the application s JAR file from the URL specified in the JAD file and install the application into the local package manager Note that both the JAD and JAR files are downloaded using the cleartext and non-integrity-protected HTTP protocol The use of signatures mitigates the risk that an attacker could modify the application as it is downloaded Of course, the attacker could just remove the signature, but that would hopefully cause the user to not accept the application s installation or cause the device to run the application with reduced privileges
Permissions and User Controls
The MIDP security system is clearly described in the MIDP specification and should behave similarly on all devices In the real world, many phones and carriers do behave slightly differently, and this is one of the primary challenges of JME development Each application is granted a set of permissions that allows the application to use sensitive phone functionality (for example, GPS or the cellular network) The permissions are defined using fully qualified package names Earlier in the sample JAD file, you saw the permission javaxmicroeditionioConnectorhttp Many of these permissions are defined in the MIDP JSR, but Optional JSRs may define permissions as well The Location Services JSR, for example, defines permissions that are required in order to access location data Applications are isolated from each other almost completely, with small exceptions made for applications signed with the same signature Not all applications may be authorized to use all permissions because not all applications are equally trusted JME applications trust is determined by examining the application s origin and integrity Most devices use X509 certificates and rely on the certificate s common name (CN) and issuing CA as proof of origin The signature in the JAD file binds the origin to the application and ensures that the application s code has not been tampered with since it was signed
Mobile Application Security
After its identity is verified, the JVM assigns the application to a protection domain These are groups of permissions that allow access to certain classes and functionality A MIDlet suite may only be allowed to access one protection domain at a time, although MIDP 30 may change this Frankly, having more than one set of permissions applying to an application at one time may be confusing It will be interesting to see how that problem is resolved The protection domains are not standard across manufacturers and carriers, but with MIDP 21 there was an effort to standardize protection domains for GSM/UMTS phones This effort produced the following domains, as detailed in the MIDP 21 specification: Unidentified Third Party protection domain (aka untrusted) All unsigned code is placed in this domain Irrespective of the MIDP 21 specification, all phones must have an untrusted domain and support running unsigned code Identified Third Party protection domain Code that has been signed with a certificate issued by a CA that the operator or manufacturer trusts Code in this domain may be able to use the network or advanced phone functionality without user prompting Operator protection domain A highly trusted domain restricted to code signed by an operator-owned certificate Generally allowed to do anything on the device Manufacturer protection domain A highly trusted domain restricted to code signed by a manufacturer-owned certificate Generally allowed to do anything on the device Not all carriers follow these specifications exactly, but any changes tend to err on the more restrictive side T-Mobile North America, for example, doesn t include an Identified Third Party domain Therefore, applications signed with popular JME signing certificates aren t allowed to run on T-Mobile s phones The untrusted protection domain is a special case and must exist on all MIDP phones Applications without signatures are automatically placed in this domain, and for many applications that arrangement works perfectly well Games, for example, don t need to access much of the phones functionality, and the MIDP API set is intentionally designed to allow them to run without requiring signatures or special permissions This means there are a lot of unsigned JME applications out there Interestingly, if an application has a signature that is either unknown or corrupted, the application will not be placed into the untrusted zone Instead, the application will simply be rejected This causes problems for developers with applications signed with a certificate that is recognized on one network but not on another Just like getting into an exclusive night club, getting into the desired domain on certain carriers can be a combination of luck and skill
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