whatenc 0.3.1

Simple text encoding type classifier

whatenc

Text encoding type classifier.

whatenc is a command-line tool that uses a gradient-boosted tree classifier to detect the encoding of a given string or file.

The model is trained on text samples from the Wikipedia corpus, with lines encoded using multiple encoding schemes to generate labeled examples.

How It Works

whatenc applies a feature-based approach to characterize text, then feeds these features into a gradient-boosted decision tree model to classify the encoding.

Feature Extraction

Each input string is converted into a feature vector describing its statistical properties.

Features include:

Feature	Description
Length (n)	Number of characters in the input
n % 4	Useful for identifying base-N encodings
Printable Ratio	Fraction of characters in string.printable
Alphabetic / Digit Ratios	Ratio of letters and digits to total length
Padding Ratio (=)	Common in Base64/32 encodings
Compressibility	Ratio of compressed to raw byte length
Shannon Entropy	Measure of randomness in character distribution
English Letter Correlation	Correlation between letter frequencies and English letter frequency distribution
Stopword Ratio	Fraction of English stopwords

Supported Encodings

whatenc currently recognizes the following formats and transformations:

Category	Encodings
Base encodings	base32, base64, base85, hex, url
Text ciphers	rot13, rot47, morse
Compression	gzip64
Hash digests	md5, sha1, sha224, sha256, sha384, sha512

Installation

You can install whatenc using pipx:

pipx install whatenc

Usage

whatenc aGVsbG8gd29ybGQ=
whatenc samples.txt

Examples

[+] input: aGVsbG8gd29ybGQ=
   [=] top guess   = base64
      [~] base64   = 0.455
      [~] plain    = 0.312
      [~] url      = 0.126

[+] input: hello
   [=] top guess   = plain
      [~] plain    = 0.552
      [~] url      = 0.246
      [~] rot13    = 0.192

[+] input: uryyb jbeyq
   [=] top guess   = rot13
      [~] rot13    = 0.555
      [~] plain    = 0.440
      [~] url      = 0.004