# Search results

##### Result by tag 21 results

- Substitution Cipher Tool
The tool to encrypt/decrypt messages with simple substitution cipher given as key. It is also useful for manual cryptanalysis of substitution cipher - when you have message written in English alphabet partially decrypted with automatic tool and want to tweak the key.

- VARIANT DATE to datetime string
This online calculator converts VARIANT DATE (double) value to datetime string.

- Base 64 encoding and decoding
The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

- Email extractor
This online calculator parses emails from block of text using regular expression

- LL1 grammar analysis. Yet another top-down parser generator.
The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

- Playfair cipher
This online calculator encrypts and decrypts a message given Playfair cipher keyword. Non-alphabetic symbols (digits, whitespaces, etc.) are ignored.

- Binary Coded Decimal (BCD)
This online calculator converts decimal number to binary code in BCD notation and vice versa

- GET request string parser
This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

- Hill cipher
This calculator uses Hill cipher to encrypt/decrypt a block of text

- Regular expression tester
This online calculator allows user to experiment with regular expressions.

- Shannon Entropy
This online calculator computes Shannon entropy for a given event probability table and for a given message

- Symbol frequencies table
This online calculator builds symbol frequency table for a given message

- Binary, inverse and complement codes
Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

- Caesar cipher
Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

- Conversion between any bases
This calculator converts number from one numeral system to another, given both system's bases

- Conversion from decimal numeral system
This calculator converts given decimal value to other positional numeral system

- Conversion of fractional numbers between numeral systems
This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.

- Count the number of words
The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.

- Huffman coding
This online calculator generates Huffman encoding for given frequency of occurrence of symbols.

- Simple math in any numeral system
This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36