Can anyone give me code or links for sample 128 bit CFB type of AES IMplementation.
Can it be written using .Net. If so can you please explain how.
Thanks
This answer on SO might lead you in the right direction. Hope it helps!
Update: From the example linked above (I don't want to copy-pasta #Dan Esparza's entire answer) I believe you'd just make a call to:
myRijndael.Mode = CipherMode.CFB
To get the behavior you're looking for.
Related
I found MurmurHash recently as one of the fastest, and MurmurHash3 is the new version of MurmurHash.
I also found the complete explanation of MurmurHash in a Diagram by Ian Boyd.
This diagram really looks awesome but I understand only a bit of it since I'm still a newbie and have interest in Hashing.
It would be very helpful if someone could help me with a simple MurmurHash3 Flowchart.
Since I'm a newbie and still can't add any comment there, I also don't know how to contact Ian Boyd either, I'm trying to ask it here..
update
I made my own MurmurHash3 flowchart.
Will upload it later
I'm sorry for my noobness and bad in English. Thank you
I know I am reply late, but it may help any one else...
Murmur hashing is a non cryptographic hash function
which is used for hash based look-ups , it uses 3 basic operations as a whole Multiply, Rotate and XOR. It uses multiple constants which are just there to make it good hash function by passing 2 basic tests.
Avalanche Test
Chi-Squared Test
You can watch this video, which I made, for the detail explanation of Murmur Hashing.
I can't figure out, how to set a logic and the according options in Scala^Z3.
Guess its really simple, but I just can't find it.. so I really would appreciate some help there ;)
Regards,
Florian
ps.: Scala 3.2 and Z3 4.0 work really fine together :)
In case you are still looking...
There are two ways to set options:
Pass the parameters when you construct your Z3Config instance, e.g. new Z3Config("MODEL" -> true).
Call .setParamValue on a Z3Config instance, e.g. myConf.setParamValue("MODEL", true).
Now to answer the particular question on how to set the logic, that is unfortunately not supported by Z3's API. You can take a look at Leo's answer to this similar question for C#.
Note that strictly speaking you don't really need that option when using the API, though: all theories can be used and Z3 will magically figure out what to do.
I have a NSString like #"123456". I want to convert this string into byte array and then I want to shift some bytes using some arithmetic operations. Then I want to apply SHA256Hash on that and finally want to encrypt a string using the final result. I have tried many approaches but still got no success. I am very confused in this.If someone wants to look at code i'll post the code.
Edit:
My actual goal is to encrypt an string using AES256 encryption algorithm. And I want to generate my own key and I want to pass my own IV.
I assume you're trying achieve some kind of security. On the other hand it does not look like you're very familiar with the tools and methods you're using. This is a bad start.
Security is a very difficult thing to do—even for experienced developers. Maybe there's a way to reuse some existing implementation for your security needs.
My advice would be not to reinvent things, especially when they are as hard and as crucial as security.
What's the best way to go about autogenerated keys for Pilog? i've
been digging around a bit and can't find anything related.
Hints and pointers would be most appreciated. Thank you.
You get the same behavior as auto increment in for instance MySQL with this
one: http://software-lab.de/doc/refG.html#genKey
I use it a lot in the VizReader code.
I'm not so sure I would've used it much though if I had know about the (id)
function from the start: http://software-lab.de/doc/refI.html#id
In my case it's all about displaying a nice id that is easy to relate for
humans and JavaScript in my non-traditional gui and as you can see both
approaches accomplish that but that latter is imo more elegant.
/Henrik Sarvell
(Copied verbatim form Henrik Sarvells' answer.)
I am looking for checksum algorithm written in obj-c so that I can validate a ticket(number) and generate 2Dbar code based on validation.
Any ideas on how to achieve this?
Thanks
Sounds like you can use a public-key cryptographic function.
Encrypt with the private key fixed length information, including a number (the real ticket number) and a random salt (to reduce the chance of someone cracking your key), into a fixed length output.
You can then use the public key to decode that output and verify that the information is there.
Here is some Apple sample code that demonstrates the use of cryptographic functions.
For 2D barcode code, you could start by looking at ZXing