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What is ROT13 algorithm?
ROT13 (“rotate by 13 places”, usually hyphenated ROT-13) is a simple Caesar cipher used for obscuring text by replacing each letter with the letter thirteen places down the alphabet.
How do you use ROT13?
ROT13 = Rotate the string to be encrypted by 13 positions (modulo 26) in the alphabet of 26 characters. If you want to encrypt a string, shift each character forwards by 13 positions in the alphabet. If you move past the last character “z”, you start over at the first position in the alphabet “a”.
What cipher uses special characters?
The Caesar cipher is a classic encryption method. It works by shifting the characters by a certain amount. For example, if we choose a shift of 3, A will become D and E will become H. The following text has been encrypted using a 23 shift.
Is base64 a cipher?
Base64 isn’t really a cipher, since there is no key. It was originally used to encode binary information like images into a character string consisting only of printable characters so it could be sent over text protocols like http.
What is the main strength and weakness of symmetric encryption?
Symmetric encryption is also called “secret key” encryption because the key must be kept secret from third parties. Strengths of this method include speed and cryptographic strength per bit of key; however, the major weakness is that the key must be securely shared before two parties may communicate securely.
What’s the difference between ROT13 and ROT47?
ROT47 is a derivative of ROT13 which, in addition to scrambling the basic letters, also treats numbers and common symbols. Instead of using the sequence A–Z as the alphabet, ROT47 uses a larger set of characters from the common character encoding known as ASCII.
How is ROT47 used in modern programming language?
ROT47 basically makes text unreadable and does not require addtional space. The ROT47 can be easily implemented by modern programming language in many many ways, e.g. using a lookup table. For example, the following PHP code uses strstr to convert the text by using a lookup table.
How is the ROT47 cipher implemented in Python?
Alternatively, ROT47 can be implemented by computing directly the ROT47-ed ASCII of each given character. Someone is nice to wrap this up and provide it free in NPM (Node Package Manager) in NodeJS . The following is a classic ROT47 cipher implementation in Python.
Is the ROT47 encoder an invertible algorithm?
It is an invertible algorithm i.e. applying the same algorithm to the input twice will get the origin text. The page provides a Javascript implementation online ROT47 encoder/decoder.