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# Rafael S.T. Vieira

##### Last seen: Today
3 557 total contributions since 2020

I'm a post-doctoral researcher of Computer Science at the Federal University of Ceará. And I hold a Ph.D. in Computer Science with an emphasis in Computer Graphics.

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Elliptic Curve Cryptography (ECC) Point Addition
Given two points (P and Q, they can be the same points on the elliptic curve), compute ECC point addition on a Weierstrass ellip...

25 minuter ago

Solved

Increasing sub-sequence (Level 1)
Given a vector, v, of real numbers, return a positive integer, n, representing the longest contiguous increasing sub-sequence co...

ungefär 2 timmar ago

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RIPEMD160 Hash
Generator the RIPEMD160 hash given an input string and output the hexadecimal RIPEMD160 hash. For example: Input='My name is...

ungefär 4 timmar ago

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SHA256 Hashing
Conduct SHA256 hashing on a hexadecimal input to produce a 256-bit hexadecimal output. Example: hash = SHA256('aa') hash ...

ungefär 12 timmar ago

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Cat's paw - 01
lets imagine a cat, standing on an infinitely long row of tiles. since its a 'cat', string length=3; it takes 3 tiles to stand. ...

ungefär 15 timmar ago

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Image Processing 01: Vignetting Correction
The task is to correct image files for IR scanning sensors that due to errant tolerancing and structural instability have varyin...

ungefär 15 timmar ago

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Image Processing 002 : Fix Vignetting in a Visible Sensor
The task is to correct image files for Visible scanning sensors that due to errant tolerancing produce vignetted(V) images. The ...

ungefär 19 timmar ago

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Rotation matrix of a sequence of 3D points

ungefär 22 timmar ago

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Evaluate the gamma function
The <https://mathworld.wolfram.com/GammaFunction.html gamma function> is a generalization of the factorial, and it appears in ma...

en dag ago

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Add all the numbers between two limits (inclusive)
In this problem you must add up "all of the numbers" between two specified limits, |a| and |b|, in which |a| ≤ |b|. However, th...

en dag ago

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Flexible Anonymous Function
Given a function handle, return a handle to a function that would accept an arbitrary number of inputs, applies the function to ...

en dag ago

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Mask Generation Function (MGF1) for PKCS #1 Standard utilizing Optimal Asymmetric Encryption Padding for RSA Cryptography
Create Mask Generation Function (MGF1) from PKCS #1 v2.2 standard (B.2.1 page 50) at below link. Input will be character array (...

2 dagar ago

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Determine RSA keys (public and private) given two prime number character strings (p and q)
Given two prime number character strings (p and q), generate the RSA public and private keys (n and d) with e = 65537. The more ...

2 dagar ago

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RSA decryption
Decrypt a large integer string using RSA decryption given the public key (n) and private key (d). Convert the large integer decr...

2 dagar ago

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RSA encryption using public key
Encrypt the message text by converting to uint8 matrix using UTF-8 representation. Convert uint8 matrix to a large integer strin...

2 dagar ago

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Sum of all the divisors of n

3 dagar ago

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Ternary Conditional Operator
Returns one of two expressions depending on a condition. (test) : (expression1) : (expression2) *test:* Any Boolean ex...

3 dagar ago

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Derivative function
Given a function handle f, generate a function that evaluates the derivative of f Examples: f = @sin; df = De...

3 dagar ago

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PRIME GENERATOR

3 dagar ago

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Find the value of Y

3 dagar ago

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NaN

3 dagar ago

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imaginary

3 dagar ago

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Real

3 dagar ago

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Size

3 dagar ago