I'm new to SDR, I'm trying to perform a replay attack that consists of unlocking a blocked car with hackRF ONE and the software gnu radio companion but the problem is that when I record the unlock signal, then I run the replay attack, it locks the car if it is unlocked and does nothing if it is locked.
I want to clarify that I used as a frequency of 433 Megahertz. I would have liked to share my flowgraph but my reputation does not allow me. If anyone had a similar problem or know the solution to my problem, please share with me.
Thank you
Probably your key fob is using challenge-response exchange with cryptography. Try to use URH (Universal Radio Hacker) to analyze protocol.
Check this video tutorial playlist https://www.youtube.com/watch?list=PLlKjreY6G-1EKKBs9sucMdk8PwzcFuIPB&v=kuubkTDAxwA
And this keynote A Suite for Analyzing and Attacking Stateful Wireless Protocols
And my simple tutorial about replay attack https://habr.com/ru/434634/
Related
I am a developer who is still learning . I want to design an app which can allow multiple people to have a video conference/chats simultaneously something like zoom . I know i can design native apps like specific for Android as well as iOS but I am still learning Android development and have no idea about iOS code .I searched and found that we can have hybrid apps having React,Node.js or with Angular.js and they work on different platforms .But as I'm a newbie I need suggestions as well as guidance .what I'm expecting in my app are following things :
Should support all video resolutions and audio quality, should
work in low and high network scenarios
Should be low on usage of power/ processor
Should not have any external hardware dependency
Should work on any device
Should have chat option during conference, even the multi
people conference
Should have sign-in and non-sign-in options to join a
conference
Can be browser and/or app based interface
Should have encrypted network communication
Should have audio/ video recording feature
Should have screen/file sharing capabilities
Should allow audio to close captioning during chat
(multilingual)
Should have capabilities to host multiple concurrent
conferences having multiple participants in each conference
I know its a tedious task to involve everything I discussed but I need guidance how to do this .
I have already told my expectation so now I want to know what steps I need to do so ,How to start as well as where to start ,what language/library I should choose ,whether having a hybrid app be a good idea or should I go for native apps .As I have earlier said I am a learner so I am going to learn each and everything to get my project done ,so whether its react or node or angular or whatever experienced developer are going to suggest/guide here .I know my question may look broad or even vague but still I am asking only because I see stack-overflow as a group of supportive accomplished coders .Hope you guys will help me in getting my project done .Thank you !
OK then you have got much work to do. I will point you to some references which should give you a good start. I will try to keep this as short as possible.
As you mentioned, WebRTC is the way to go.
With WebRTC, you can add real-time communication capabilities to your
application that works on top of an open standard. It supports video,
voice, and generic data to be sent between peers, allowing developers
to build powerful voice- and video communication solutions. The
technology is available on all modern browsers as well as on native
clients for all major platforms.
This blog explains how WebRTC functions in details - https://medium.com/#anto.christo.20/understanding-web-real-time-communication-webrtc-d4cec5a43f2f
This blog explains how to build peer2peer video calling in android -
https://medium.com/#anto.christo.20/understanding-web-real-time-communication-webrtc-d4cec5a43f2f
https://webrtc.org/ also contains lot of headstart material including sample code.
Once you have done this you can add other features on top of it.
Now, this will take care of peer2peer but if you want o build a multi-user functionality from scratch there is some extra work required as mentioned in the answer - how to build multi-user video chatting web app using webRTC, node.js and socket.io
I am attempting to make my app, this is an app that will integrate live streaming that could be accessed by anyone that is signed up. I have been searching and the information is very vague.
What factors do I have to take into consideration to make an IOS app with live streaming?
I would have no clue how to implement any of this and I haven't seen much documentation about how to implement this. What third party software would I have to use, would I need to create something in a different programming language?
This app is going to be only for IOS for now.
Thanks,
The question is, how many users? How much do you want to spend? How critical is performance/quality/downtime, etc.? Is this a business app?
Due to having multiple users connect to one stream, I would suggest that the streamer streams it to a server, whereby the server deals with the bandwidth requirements to clients, allowing for it to more easily scale. If it is a one-on-one or up to maybe one on three, you could still think of p2p for a social stream (e.g. streaming to family) but not e.g. a business conference (unless you want them to have e2e encryption, avoiding server, etc. which is usually complete overkill, though do implement encryption if possible, quite easy using libraries).
Now if you're asking coding wise, look for some tutorials, e.g. https://www.raywenderlich.com/5191-video-streaming-tutorial-for-ios-getting-started is quite nice, it's quite straight forward and will probably do what you want for the client accessing it. Use the AVFoundation Playback https://developer.apple.com/av-foundation/ it has links to HTTP live streaming and how to implement it as well.
As a final school-graduation project I try to develop a kind of spying-car. Which means there is an iPhone placed on a little LEGO-car and an iPad used as a "steering wheel" for the car. Also it is planned to transmit Audio and Video from the iPhone's microphone/camera to the iPad (more than the steering data vice versa).
In the first place the connection from iOS to iOS should be established over a local WiFi network and later - if possible - over 3G (by using the iOS devices network-IP and a DNS server to deal with frequently changing addresses).
My question is: which technology do you recommend using? I read about GameKit, peer-to-peer and so on, but I think these technologies are too abstract for later being able to communicate over 3G. I guess I need to go a little deeper into the low levels of the communication progress. Any suggestion that could bring me a step forward is highly appreciated! (also regarding other parts of my project)
One more thing: Some user suggested using a third party service and to route the sent (video) data over an external server. If possible, I'd rather not use any "middle man". It should just be a basic server-client communication where the iPad is the server and the iPhone the client.
It is kind of an open ended question, but interesting.
First of all, GameKit do have 3g p2p support, see here:
https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/GameKit_Guide/Matchmaking/Matchmaking.html
It will handle the peer-to-peer addressing and establisment of the socket. It can also handle voice chat, but I personally never tried this feature so I can't say if it is feasible in your case.
One idea is to leverage existing video-chat services. This will give you a low-latency audio/video channel with peer-to-peer addressing (well, likely using a central server).
Apple's FaceTime is such a service, but there is no public API to it (AFAIK). Same goes for Skype and Google.
There are some paid services that look like they have nice iOS APIs:
http://tokbox.com/platform
http://docs.weemo.com/sdk/ios/
You have to figure out a way to transmit control commands to the peer iPhone, I did not see if the services above had any possibility of sending text messages/arbitrary data.
Tokbox has a free trial so you could try it out and see if it works for you.
I would go for GameKit if this is a hobby project on a budget and there is time for hacking, and probably look into a more high-level API if there is a deadline...
sorry for writing this as an answer, but i don't have enough rep to comment...
i'm working on a similar project and i currently don't have any advice regrading video-streaming, however, from what i read (extensively) i came to the conclusion that i need to use p2p connection between devices for better performance and use socket programming in order to achieve this (although not the most easy to implement choice).
I considered using GameKit which i think will probably answer most of your needs as Krumelur pointed out. but in my case, eventually the app will be cross platform so i had to use low level network programming. you can check out my question here to see the sources i used to try and make the connection between 2 peers, hopefully you'll have better luck than me...
All,
Apologies in advance - this question might be too open-ended for SO.
Anyway... A friend of mine (an engineer and entrepreneur) is in the process of building a high-tech piece of lab equipment. He's asked me about the feasibility of building an iPhone/iPad/iPod application that would allow users to control the device via Bluetooth, so I'm helping him gather some information. I'm hoping to get a few pointers on how to get started. Specifically:
Would this require a native app, or could this be accomplished with HTML5 (with or without something like PhoneGap?)
Can you point me to a good primer on bluetooth networking? Everything I've found assumed a VERY high level of pre-existing knowledge.
What are the basics on how something like this is accomplished? Is there a single, established protocol for how one device "controls" another, or is bluetooth more like SSL - just a pipe that allows you to convey any type of message?
I realize this question is incredibly broad and detailed - so I'm not really looking for specifics. But obvious Google searches don't turn up much, and I'm otherwise having a hard time finding a good starting point.
Thanks in advance.
You can communicate via bluetooth in two ways: One is using the Low Energy Bluetooth capabilities of iOS 5 and newer iPhone/ipads.
https://developer.apple.com/library/ios/#documentation/CoreBluetooth/Reference/CoreBluetooth_Framework/_index.html#//apple_ref/doc/uid/TP40011295
Unfortunately the documentation is sparse and will require some hacking away. If you choose this route I would consider starting here and learning as much as you can about how the protocols work before hacking into the framework:
http://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx
The limitations of this route are that it might not be best for sending a lot of data. I have only built stuff that sent simple commands which it does work great for.
The other option is the external accessory framework. This will require you to get an mfi license from apple (not fun). You will also need to pay royalties. But it will do what you want. You won't need to concern yourself much with underlying protocols if you use this, the framework provides a friendly api for processing streams.
http://developer.apple.com/library/ios/#documentation/ExternalAccessory/Reference/ExternalAccessoryFrameworkReference/_index.html
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Greetings
I may have imagined this but does anyone know if Last.fm previously used some form of open source project to perform analysis on music to determine similar music.
As its now moved to a pay version I'd like to make something which can add known music to my playlist. (I hate scanning my computer for similar music manually)
Failing that - does anyone know of any system that I could use to replace this ? Ideally I'd like some form of API / Source code that I can use to automate the whole process into batch jobs.
Thanks,
[edit]
Ideally I was looking for something more along the lines of content matching. I'm the type of person who just throws all my music into one unorganized location. Then being lazy I would ideally expect a playlist to be generated giving me a similar music type of playlist.
Last.fm uses http://www.audioscrobbler.net/ - it also provides access to its database via an API.
[/edit]
Music similarity is not an easy problem.
There are two general approaches to solving this problem.
Approach 1.
Throw data at the problem. This is the approach LastFM and Pandora take. It's basically one huge database which is maintained by either a community or group of experts. Note that to use this approach you will need clean metadata or some kind of audio fingerprinting solution like musicbrainz. Once you have the feature database you can use algorithms such as Pearson correlation coefficient to find similar items.
Approach 2.
Throw algorithms at the problem. In particular, computer audition algorithms. This means you calculate vectors of various features a song contains and using neural nets and a variety of other techniques you find other songs with similar vectors. This approach has been used successfully for automatic genre classification and query by example.
If you are looking for open source software for music analysis, marsyas can do pretty much everything the commercial stuff can do. Its the brain child of George Tzanetakis and on his web site you can find many papers about the state of affairs with computer audition.
There's a web API at The Echo Nest that includes a get_similar web service that allows you to retrieve similar artists to a set of seed artists. You can use this to help build playlists. The Echo Nest also has a set of web APIs that will perform a detailed analysis of a track (similar to the aforementioned Marsyas) that one could use as the basis for an acoustic-based song similarity method. (Caveat, I work at the Echo Nest). Of course, if you use iTunes, there's some canned solutions. iTunes now has a music recommender / playlist generator that will build playlists of songs from simliar artists. Similarly, the company Mufin has an iTunes add on which will perform acoustic analysis of your tracks and use this analysis to build playlists.
If you are interested in building your own music similarity system, I suggest that you take a look at the proceedings for ISMIR (the International Society of Music Information Retrieval). There's quite a bit of research around music similarity and playlisting that you'll find helpful. You can find the proceedings at ismir.net
Wouldn't it be simpler/more efficient to query(build?) some internet database based on genre/style/etc? I used last.fm and similar sites but never felt they did anything more then this (at least the results weren't indicating that) ;)
I am not very sure what exactly you want, but how about MusicBrainz?
To be clear, AudioScrobbler is the tech built by Last.fm to run their service. They collect stats on the tracks which people listen to (also 'Like's of tracks and artists).
So Last.fm does social similarity... users who listened to X also listened to Y - you like X so maybe you will also like Y.
Given a large enough user base submitting stats, social similarity is likely to provide better results than computer analysis approaches. For example, try querying the Last.fm API for similar artists to someone you know - probably comes up with some good matches and a few obscure or oddball ones, which nonetheless reflect real people's listening habits. The more obscure the artist you search for the more likely you'll get weird matches.
Even if you could get the automatic genre classification method described by George Tzanetakis to work well you are missing out on the subjective judgements of quality supplied by real people. eg two tracks both look like 'Jazz' but there are many different kinds of Jazz... and I might be interested in non-Jazz albums that a favourite jazz musician has played on. Social similarity would be more likely to capture that info.
I used to use Predixis Magic Mixer. It will perform a brief analysis of the audio in a file, produce a "finger print" and compared it to fingerprints in a central database. If listed, it would set an identification code which is the result of the analysis of the entire file into the client copy. If not, it would do a full analysis on the client computer (takes a while) and upload that to the central database and keep the local copy as well. From that information it can set up a play list that relates tunes, one to another' depending upon the actual sounds. I have not used it for a few years so I don't know if the central database servers still are in operation, but a web search says no. It should still work, but every file will require full analysis.