How to do RSA encryption of byte array with base-64 encoded public key?
After reading the couple of articles( of google search ) on how to do RSA encryption in Java, found the following snippet.
CODE:.........
I have public key as a base64 encoded string (126 characters), How do i create 'PublicKey' with the encoded string and use it with Cipher.
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For a research project we need to capture video on the HTC magic and transmit this video over a network to other devices, both HTC magic's and desktop pc's (which have their own implementations of the codecs).For the transmission over the network we are using some of our own native libraries, which have all compiled fine and work. These libraries work via the RTP (Real time transfer) protocol. This poses a significant problem because RTP expects detailed information about the contents of each packet (exact timestamp, sampling rate, which part of which frame is in each packet etc.) So we tried the method described at http://www.mattakis.com /blog/kisg/20090708/broadcasting-video-with-an This appears the only way to get the MediaRecorder to send it's data to our native application. So we run a server-socket on the native side, send MediaRecorder output to a FileDescriptor of a javasocket. The native side does receive data. 2 problems however :
1. Like said in the blogpost : header information etc. is not filled in, so if we write the data to file from the native-side, it's not playable.
2. The socket we write to is TCP, so a stream implementation. So there is no clear way to know where each frame begins and ends (because the data comes in continuously). And that's the main problem : we can't package the data in good RTP packets for transmission! Nor can we get good information about the timing etc. So we looked into OpenCore a little bit, hoping to be able to do it through JNI-interfaces ourselves (or maybe even directly with the native implementations from our native code). This has proven a daunting task, because so little documentation can be found on these things. So the question is : Is it possible to get the encoded video (and audio) data with clear frame-separation and good timing-information for RTP transmission? (It is not an option to use anything but RTP, as the research is partly about RTP possibilities)
Can anyone tell me how to store the encoded content which is in xml in to the string variable and after that i will display that in webview.
View 2 Replies View RelatedObviously the answer is no... right? The reason I ask is because I have this string defined in XML for an Android app:
<string name="foo"><![CDATA[<html><body><p>This%20is%20a%20test</p></body></html>]]></string>
All I do to the string is read it, and display in an HTML view. I would not have expected the %20s to be interpreted, yet they are. Is this the correct behaviour, or is Android being typically buggy?
Is there a base64 encoding/decoding utility anywhere in the Android SDK ? I wouldn't want to reinvent the wheel.
View 4 Replies View RelatedI need to use Base64.decodeBase64 in my application, I had to download and include it myself into my project from apache commons.
Why is this not included in the default Android base system? Are there some weird licensing issues with this function or is it hidden somewhere else under a different name?
How to decode a base64 encoded string to byte array on Android API level 7?
Can it be done using any standard packages of Java?
Should i copy the source code from google search results?
Should i re-implement encoder and decoder according to RFC?
API level 8 has util package android.util.Base64 that does this, but i have to do development based on API level 7.
I want to convert a image into Base64 format and send it to server. I have one Base64 class which accept byte array and return a string.I am sending image into chunks of data.I am creating creating one chunk of 100kb. If image is less than 100 kb then image is uploaded on server, but if it is greater than 100kb (i.e when it requires more than one chunk) then it will not uploaded. I think it is because I am converting image into Base64 in parts and on server it decode it only in one shot. Now I want to send a image for conversion of Base64 only in one chunk. But if image is too large then it throw OutOfMemoryException (Obviously after all it is mobile having very limeted resources).
My code is as follows:
CODE:...........
Is there any way that I can convert a base64 String to image in Android. I am receiving this base64 String in a xml from the server connected through socket.
View 1 Replies View RelatedIn the app I am making, I would like to take a Base64 image that is received from a server, and save it to a file for displaying later. My question is where should I store this file? It needs to be dynamic, and may be empty when the program launches. I am unsure how exactly the file system on Android works, such as how file paths look.
Ideally I would like to be able to write the data to the image file using a FileOutputStream, and then display that image somehow.
In an android application we are receiving a byte64 string.I need to convert these strings to images.
View 1 Replies View RelatedIn my application i need to convert Image to Base64 format. how i can do that?
View 2 Replies View RelatedIm trying to convert a byte array which is in Base64 format to String as below. Data was not assigned properly to the String. Do I need to pass the encoding type while creating the new String?
View 3 Replies View RelatedI have a problem in converting base64 string to bitmap in android. I am using the camera to fetch the image and i am convert the image to base64 string to post to the server. I want to show that image in the imageview so how can i show the image in the ImageView after fetching the image from the camera.
View 1 Replies View RelatedWhen I open a txt file the text is encoded and cannot be read.The file can be opened with Adobe; but ThinkFree automatically opens the file.
View 1 Replies View RelatedShort version: What is the best way to get data encoded in an MP3 (and ideally in an AAC/Ogg/WMA) into a Java array or ByteBuffer that I can then manipulate?I'm putting together a program that has slowing down and speeding up sound files as one of its features. This works fine for WAV files,which are a header plus the exact binary data that needs to be sent to the speaker, and now I need to implement it for MP3 (ideally, this would also support AAC, Ogg, and WMA, but since those are less popular formats this is not required). Android does not expose an interface to decode the MP3 without playing it, so I need to create that
interface.
First, I want to save the encoded video stream from the encoder,And then, the encoder recieves the uncompressed video stream from camera. How can my application recieve the compressed stream from the encoder?
Second, I'd like to add the custom composer engine to media framework(opencore), And then I'll use the already-launched device, HTC Hero and Motrola Droid, etc. The custom composer engine will recieve the video stream from the encoder. And, save the stream using the custom file format. Is it possible add the custome engine using the already-lauched device? If it is posselbe, where can I find the references?
Is it possible to encrypt a whole external sd card(or a part of its partition i.e ext/fat32) and mount it at boot time or when ever users wants.
View 2 Replies View RelatedSecurity is top priority for me, i realise there are apps out there that can remote wipe lock etc, but if the thief is quick enough to take out the sdcard and put it in another phone the sdcards contents can still be accessed can't it?
So i would like to know if there is anyway to encrypt or protect the sdcard and the contents within it?
I want to write an app which encrypts the data and decrypts it into original data.
But I dont know how to do it.
can any one please guide me how to do it.
if possible please show me some example.
I am working on an android application, and I need to use encryption for one aspect of it. I am really indifferent to which algorithm I use (AES, DES, RSA, etc...). I am aware that Java has a crypto package, but I am not at all familiar with. Can someone post an example on how to do an encrypt/decrypt function?
View 2 Replies View RelatedI am new to android. i am trying to learn and work on it.can some one help me with the following issue.
i have some fields to be encrypted and uploaded to the DB using android.
the fields which should be encrypted are DOB,Email id, Phone number and some othe numeric value.
now i am doing some formal encryption by substitution.
Can some one help me with an example to do some standerd form of encryption.
Is there a way to encrypt a file in Android 4.1?In Linix vim there is an option (vim -x) to do this, but it does not seem to be present in VimTouch.I'd like if possible to share an encrypted file between PC and phone.
View 1 Replies View RelatedI want to know if I can create an application in android that encrypts your voice in a normal phone call and sends it to the destination where it can then be decrypted.
View 2 Replies View RelatedIs there some code snippet that show how to encrypt a password with Android and then decrypt it with php?
View 11 Replies View RelatedI want to encrypt file and store it in SD card. I want to decrypt that encrypted file and store it in sd card again. I have tried to encrypt file by opening as file stream and encrypt is but it is not working. I want some idea how to do this.
View 1 Replies View RelatedI'm the PC admin for a Public Library in Florida. I keep the labs running. I have NO experience with Android. We never have enough PC's for the public at peak times. Putting in more PC's is expensive, or even impossible in some buildings. I'm always looking for ways to serve more patrons cheaply. Portable PC's are an idea for getting around this, but have problems. Notably, some are going to get stolen. All of them will get used heavily and often by people without the necessary skills to keep their data private. Sometimes they get used by our young hacking community for naughty things. I saw the Cherrypal PC and got interested. These things are ultra-cheap. That's enticing.
So here's my big question: How do I lock down an Android public PC? Specifically I need the machine to boot or log to a state that's exactly what I want EVERY time a new user comes on. There can be no remaining information about the old user (credit cards, passwords, chat history, etc.) that the next user can steal. Can I lock down the PC's? Is it easy and fast to restore to a base state that has the homepage and appearance that I want for the library, while keeping away changes I don't want? Is there anything that would keep Android from being a good addition to public PC's in the library?
Would it be possible for me to build an application that enables people to encrypt call coming to me with my public key and then for me to decrypt the call data at my end using my own private key. This way I basically have a more secure communication channel which I am assuming because RSA is hard to crack would be difficult to monitor.I am asking this question from a research point of view and have absolutely not considered the factor as to how computationally feasible would such an application be. I would just like to know if there is a way for me to intercept my outgoing data using any built functions.
View 2 Replies View RelatedIs it possible in android framework to encrypt/decrypt voice data? What I am thinking is when a call comes in, and before user picks it up another local application is activated, it then encrypts and decrypts outgoing/incoming voice data?
View 2 Replies View RelatedI just encrypted my LG G2 and chose I believe a 17 character random password which includes punctuation. It's hard enough to remember and I only wish to enter it when I power on the phone. However it seems I have to enter it every time the phone locks itself. I don't want that, it's a heck of inconvenience. I just want swipe to unlock, not no pin or no pattern and only want to enter the big as password when the phone turns on. I am rooted and on the latest AT&T firmware.
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