Cyber Security

The Intended Audience Targeted Only

Web Security - Steganography, Cryptography, Ciphers, Encryptions, Hashing and more

Steganography

Concealed writing, *(the idea of hiding the existence of a message)* dates back to 440 BC.
Examples	Instructions
Steganography example 1: Zero-pixel same-background-colour font trick Hello John Doe! another hidden message perhaps something like 'Viens à l'hotel à minuit comme d'habitude tu ne peux pas savoir comme j'ai envie de toi, comme j'ai envie que tu me prennes là, tout de suite.'How are you today?	Select the 2 lines of text "Hello John Doe! How are you today?" Copy what you selected. Paste it on a TEXT EDITOR of your choice (such as notepad) to read the message
Steganography example 2: Misleading file extension trick The smiley below has an embedded message.	Right click on it "Save Picture As..." whatever name you want Save the file wherever you want Find the file you just saved and right click on it. "Open with" any TEXT EDITOR of your choice (such as notepad) Read the bottom line
Steganography example 3: Changing the file extension trick Requires good user skills, do you have Notepad++ or a similar editor installed? The following link is to a 3-second audio file. It says "Hello John Doe" when played. Please click on it to hear it for yourself. (If the browser prompts save or open, you can first save it as well.) Say "Hello John Doe"	If not saved yet, "Save Link/target As..." whatever name you want Save the file wherever you want Find the file you just saved and right click on it. "Open with" an ADVANCED TEXT EDITOR (such as Notepad++) Find the line that says "ATTENTION! SELECT and DELETE ALL YOU SEE ABOVE ALONG WITH THIS PHRASE AND SAVE THE FILE WITHOUT CHANGING ITS EXTENSION! LEAVE NO BLANK SPOTS AT THE TOP AFTER DELETION. DELETE UNTIL HERE" somewhere towards the end, at 213th line Do exactly as it says, leave no blank line at the top Save the file and close the editor. Single click on file's name and change the extension .mp3 to .jpg Double click to open the file normally, to discover the real message

Cryptography

This demo is from 2016

Using DES, "Welcome" is encrypted and salted by the word "Visitor" like this: vi1sjDttzXgXI

Secret writing, (the idea of hiding the meaning of a message) dates back to 19th century BC.

The trick is simple substitution. The catch is that when you do not know what to substitute with what, deciphering the message can become a real challenge. For eg. it would be very easy to see "12334" meant "HELLO", if only you knew 1 was H, 2 was E, 3 was L, and 4 was O. That is called "key". If you do not have the key, guessing the meaning of 12334 could be difficult, especially when the "text" is short. Contrarily, when there is a long essay to decipher, the human eye can easily see patterns and substitutions.

The demo below gives an idea.

Encryptions