Tag: cryptography

Visual Cryptography

space-invader-visual-cryptography

Visual cryptography is a technique that consists of hiding information (text/symbols/graphics) within two semi-transparent pictures (called layers). Overlaying both pictures exactly on top of one another, will reveal the hidden information. Using this technique, it is impossible to retrieve any

Atbash Cipher Algorithm

atbash-cipher

The Atbash Cipher is a monoalphabetic substitution cipher that was originally used for the Hebrew alphabet. It is one of the earliest known subtitution ciphers to have been used. As opposed to a Caesar Cipher, the Atbash cipher does not

MRX20 – Mission to Mars

mrx20-logo

The MRX20 probe was sent to Mars by the Inter-Continental Space Agency (ICSA) a few years ago. It was due to return to planet Earth just a few days ago. The probe collected a large amount of samples from the

Caesar Shift Decoder

caesar-shift-decoder

A Caesar Shift cipher is a type of mono-alphabetic substitution cipher where each letter of the plain text is shifted a fixed number of places down the alphabet. For example, with a shift of 1, letter A would be replaced

Secret Santa’s Ciphers

secret-santa-pigpen-cipher

It’s only few days before Christmas so here are some secret messages from Santa for you to decode… Secret Message #1, encoded using Maritime Signal Flags International maritime signal flags are various flags used to communicate with ships. Each flag

Vatsyayana cipher

Vatsyayana-substitution-cipher

The Vatsyayana cipher is a simple substitution cipher where the 26 letters of the alphabet are organised into 13 pairs of characters. These pairs are then used to encrypt the text by direct substitution of the letters in the pairs.

Caesar Shift (Substitution Cipher)

caesar-cipher-wheel

A Caesar Shift cipher is a type of mono-alphabetic substitution cipher where each letter of the plain text is shifted a fixed number of places down the alphabet. For example, with a shift of 1, letter A would be replaced

Frequency Analysis

frequency-analysis-english-language

In cryptography, frequency analysis is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking substitution ciphers (e.g. mono-alphabetic substitution cipher, Caesar shift cipher, Vatsyayana cipher). Frequency

Mono-Alphabetic Substitution Cipher

encryption

A mono-alphabetic cipher (aka simple substitution cipher) is a substitution cipher where each letter of the plain text is replaced with another letter of the alphabet. It uses a fixed key which consist of the 26 letters of a “shuffled

Maritime Signal Flags Translator

nautical-flags

International maritime signal flags are various flags used to communicate with ships. The purpose of the International Code of Signals is to provide ways and means of communication in situations related essentially to safety of navigation. The code uses a