Questions tagged [cryptography]
Questions regarding Mathematica cryptography related functionality (introduced in Mathematica 10).
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Where is SystemCredential stored on Windows? [closed]
Where is SystemCredential stored on Windows by default? (if stored in registry what is the registry path and if stored inside a file what is the file path). Is it ...
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Understanding and Fixing Image Encryption Using Henon Map Resulting in Original Image, Not Encrypted Image
I'm reaching out to this community in my quest to understand and improve an image encryption process using the Henon map. I have created the following Mathematica code to encrypt an image:
...
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0
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Mathematica Implementations of Post Quantum Cryptography Algorithms?
Mathematica supports several cryptographic commands like Encrypt, Decrypt and others.
This includes support for asymmetric signature ciphers like RSA and Elliptic curves and symmetric ciphers like &...
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Computing point operations on an elliptic curve over a finite field [duplicate]
I'm working on a homework problem that asks you to compute $1943(1980,431)$, where $p = 2671$, $E:Y^2=X^3+171X+853$, and $P=(1980,431) \in E(F_{2671})$.
I found the ternary expansion of $1943$ to be $...
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Find prime numbers two prime numbers given a certain constraint
The question is:
Find primenumbers p and q if n=pq=39247771 and φ(n) = 39233944.
Does anyone have an idea of how to approach this problem in mathematica?
Thanks in advance
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What exactly are the square images generated from Encryption?
i.e. GenerateDerivedKey[] or Encrypt[] gives you a byte array with an 8 by 8 color grid that seems to represents a unique code ...
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With v12.2, how to call gpg (or gpg4win) and tell it to generate RSA key pair and to return private and public key blocks and fingerprint?
Using Mathematica v12.2, is it possible to call gpg (or gpg4win) and then tell it to generate an RSA key pair and to return
private and public PGP key blocks in standand format
and the 40 hex-...
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How to use every number between 2^50 and 2^100 without having to rewrite the code? [closed]
What I have currently written returns a numerical value and stores it in b100. p and q are random integers of size 2^50. I want to use the same code to calculate values where p and q ranges from 2^50 -...
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BlockchainBlockData request limit exceeded
I'm trying to replicate this Blog entry on Bitcoin queries:
https://blog.wolfram.com/2021/05/25/sleuthing-darkside-crypto-ransom-payments-with-the-wolfram-language/
However, I don't get very far ...
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How to return two values from function
I have a function that generates cipher text for ElGamal encryption and I want to make return two values, but it returns only one. This is the code:
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Ways to hide a secret token with some code?
I worked out a way to prompt notifications to peopel using my mathematica code that a new version is available. My code is in a private github repository, mathematica can access it using http requests ...
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HMAC SHA256 implementation in Mathematica 11.3
I need a HMAC SHA implementation for Mathematica for an API authentication. I am not experienced at all in cryptography, hash functions, and HMAC. So far what I found is this:
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How to get v12.0 to print PGP public key and secret key BLOCKS after generating a key pair using GenerateAsymmetricKeyPair[]?
This question is related to, but not the same as, two others I recently asked about using Mathematica's PGP functionality: "After using GenerateAsymmetricKeyPair[], how to print the two keys in ...
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Given a PGP public key, how can I extract its PGP fingerprint in hex, using v12.0?
This is related to the question "After using GenerateAsymmetricKeyPair [], how to print the two keys in hex?" which @Sjoerd Smit kindly answered.
How can I use Mathematica v12.0 to extract ...
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After using GenerateAsymmetricKeyPair[], how to print the two keys in hex?
After using GenerateAsymmetricKeyPair in Mathematica 12, how can I print the two keys in hex?
There is probably a simple answer that I'm missing, but there's ...
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Finding Mnemonics for expressions with lots of indices
One of the equations I work with in my research are the pentagon equations:
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Cannot find CEL ethereum token
I am trying to get information aobut the Celsius token (CEL, https://etherscan.io/token/0xaaaebe6fe48e54f431b0c390cfaf0b017d09d42d) in Mathematica.
However, it seems like it is not working. These ...
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Sound steganography with `InverseSpectrogram`
Here is my code of how to hide a message inside a sound:
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RSA encryption/decryption with signed message
I was going through a book with some tasks that you can work with mathematica on, and I found this particular task interesting:
Proffesor Alice has sent an assignment to Bob, one of her students. To ...
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How to permute elements in a list
I am attempting to decrypt a ciphertext. I split the cipher into blocks of five, and now I want to permute each individual block. My goal is to be able to permute each individual block by the same ...
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How can I add a different value to each item in a list?
I am trying to decrypt a modified Vigenère cipher text. I am unfamiliar with Mathematica, so I need some guidance. Here is what I want:
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How do I generate a JSON Web Token?
I want to access a service that uses JWT authentication for its API. Generating a JWT doesn't look too difficult, it is a combination of BASE64URL encoding, and HMAC Signing. However, these things can ...
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How do I use mathematica for encryption if someone gave me their Public Key in PGP format?
How do I do Mathematica to a encrypt a message when someone has given me their public PGP key?
Does Mathematica have this functionality? Could I use Mathematica ...
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2
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Couldn't load OpenSSL library in 12.1 (Windows)
Update:
Finally I found a clumsy way to solve this bug by myself: I created an alternate local kernel to run the code, and it surprisingly works out!
It is ridiculous that two local kernels contain ...
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how to scramble and then unscramble a list of elements?
list = {"a", "b", "c", "d"};
scrambledList=scramble[list]
{"b", "d", "a", "c"}
unscramble[scrambledList]
{"a", "b", "c"...
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How do determine whether an entry in a Blockchain was submitted by myself?
Let say I have a Blockchain id id as below:-
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What are some use cases of Wolfram Blockchain?
In version 11.3, Mathematica introduces the blockchain module, together with a "Wolfram blockchain". There were mainly three functions available for users: store an expression (no larger than 8M) to ...
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Number theory in Mathematica
Is there any book out there similar to S. Wagon's Mathematica in Action that has problems/exercises/projects in the field of number theory as done in Mathematica? If not pure number theory, at least ...
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User Implemented SHA-1 is failing for strings of length >512 bits
So, earlier, I posed a question regarding getting a user implemented SHA-1 hash function to work correctly. Well, I fixed the problems, cleaned it up a little bit, but now I have the problem for when ...
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User implemented SHA-1 isn't outputting correct hash
EDIT: I'm actually Thinking the issue is in the initialization phase, where we pad the message with 1's, 0's, and the message ...
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Applying Polybius cypher [closed]
I need to define a function that can apply the Polybius cypher encoding technique.
I did some very basic case with if statement, however, if the input is random with A and B I have no idea how to ...
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Keyed Hash for HMAC SHA256 [duplicate]
I'm trying to use AWS REST API's (because I can't rely on AWSLink`). The sample C# code from Amazon uses this a lot:
...
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What is the best build-in function to pick or select given element in a huge list
im looking for a best and efficient function works like a search engine
it takes for example m=5+6I ,then it goes searching in the list V={1,1+I,2+3I,...}
until catch it .
My Dr said to use "Select[]"...
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Can Decrypt[] be forced to decrypt with a different key?
Decrypt[] will yield an error if one tries to decrypt a byte array using a different symmetric key than the one used to encrypt:
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How to construct addition and multiplication table for finite field?
For example, choose $p(X) = X^4 + X + 1$, how to construct addition and multiplication tables for $\mathbb{F}_{2}[X] \mod{X^4 + X + 1} $ ?
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How to mine Bitcoins in Mathematica?
I see that version 11.3 has some blockchain functionalities, so is there a way to mine for bitcoins in Mathematica?
Perhaps someone could provide a tutorial of the APIs to call and computations ...
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Is this decryption function idiomatic?
This is my first non-trivial Mathematica notebook, which I wrote for a cryptology homework. It encrypts/decrypts strings using an affine cipher. Is the code readable/idiomatic? How could it be ...
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Why is there a lot of noise in the Wolfram Blockchain?
I tried to look into the transaction history of the Wolfram Blockchain. I tried this:-
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How to find the block number of a transaction in a Wolfram Blockchain?
For example, in block 1004 of the Wolfram Blockchain, I can get the 4th transaction's ID by using the following code:-
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Nested BlockchainBlockData fail
New 11.3 functions to query blockchains. In trying to build a block link by iterative lookup, this function works for several iterations then fails:
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HMAC correct on 11.2 but wrong and different on 11.3 running same code
If you run this code on 11.2
...
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2
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J/Link HMAC Base64
I am trying to recreate a Java algorithm in Mathematica. It is taking a key and signing a message using the HMAC and SHA256 algorithm.
The Java code for which I am basing it off is here
I have ...
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Is it possible to convert the output of the Encrypt[] function into binary digits?
I use the following code to generate a key and then use it to encrypt a simple string message. The output of the function Encrypt is an encrypted object. But I would rather convert this into binary ...
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Can't use keys of less that 64 bits long
Probably a bug:
key = GenerateSymmetricKey[
Method -> <|"Cipher" -> "Blowfish", "KeySize" -> 16|>]
Encrypt[key, "test"]
...
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Why can't Encrypt handle messages bigger than very small?
This
keys = GenerateAsymmetricKeyPair[];
message = Rasterize[Graphics[Disk[]], RasterSize -> 10];
Encrypt[keys["PrivateKey"], message]
generates the error
<...
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Can I make a SymmetricKey with my own key value?
Mathematica has a function that one can use like this
GenerateSymmetricKey[Method -> <|"Cipher" -> "AES128", "BlockMode" -> "CBC"|>]
but it picks ...
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Decoding Message-Signature Pairs
I've been given a set of message-signature pairs to decrypt using a public RSA key I set up. I need to sort through the decoded messages, and find which of those have a valid signature. My public key ...
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Code Review: ECDSA for Mathematica
The code below contains functions related to ECDSA (Elliptic Curve Digital Signature Algorithm) with standard parameters secp256k1. The implementation is based on ...
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