Questions tagged [cipher]

Question 1

Caesar ciphers A Caesar cipher with shift=N is the process of replacing any alphabetic character in a string with the letter which is N positions ahead in the alphabet (wrapping back at the beginning)....

Question 2

I can't think of a better name. This is similar to this challenge, but a lot easier. Read three strings which contain only uppercase letters. The length of the first and second strings are the same. ...

Question 3

The autokey cipher is closely related to the Vigenère cipher (both were invented by Blaise de Vigenère). Decryption involves the encrypted message and the key. For simplicity, let us assume all ...

Question 4

Description The Caesar cipher is a cipher, where every letter in the alphabet will be rotated by a secret number. If the rotation is \$7\$, then a -> ...

Question 5

The Caesar cipher is a simple and famous cipher, where the letters of the alphabet are rotated by some secret amount. For example, if our secret rotation is 3, we ...

Question 6

To shuffle a string \$s\$, Alice applies the following algorithm: She takes the ASCII code of each character, e.g. "GOLF" → \$[ 71, 79, 76, 70 ]\$ She ...

Question 7

Alienese refers to two "languages" in the show Futurama. In actuality, they are two ciphers of English text with a pictographic alphabet. The first is a simple substitution cipher, but the ...

Question 8

Introduction Book cipher A Book cipher is a very unique method of a encipher. Here's how's it done: You have a book / a document or a article (something full of text, the more pages of text the ...

Question 9

Challenge The challenge is to implement the bottom encoding (only encoding, not decoding). There is a wide variety of existing implementations in the bottom-software-foundation org. Bottom is a text ...

Question 10

You know those riddles where every letter is swapped for another letter? E.g. you get a text like ...

Question 11

Introduction: I have loads of different ciphers stored in a document I once compiled as a kid, I picked a few of the ones I thought were best suitable for challenges (not too trivial, and not too ...

Question 12

Introduction: I have loads of different ciphers stored in a document I once compiled as a kid, I picked a few of the ones I thought were best suitable for challenges (not too trivial, and not too hard)...

Question 13

Introduction: I have loads of different ciphers stored in a document I once compiled as a kid, I picked a few of the ones I thought were best suitable for challenges (not too trivial, and not too hard)...

Question 14

The problem with the Caesar cipher is the resulting words are often unpronounceable. The problem with Pig Latin is that it is easy to decode. Why not combine them? Input A word consisting of the ...

Question 15

Your task is to decipher a non-empty string consisting of printable ASCII characters in the range [32..126]. Reading the string character per character: each time you encounter a letter in lowercase, ...

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Questions tagged [cipher]

Decode a Caesar ciphertext with high probability

Decode Caesar cipher based on a given text

Decrypt an Autokey Cipher

Play Caesar's Cipher with Letters only

Crack the Caesar cipher

Self-unshuffling strings

Alienese cycles

Write A Book Cipher [closed]

Implement bottom (encode)

Unscramble the letters by letter frequency analysis [closed]

Clock (transliterate) Cipher

Trifid Cipher (without keyword)

Computer Cipher

The Improved Caesar Pig Latin Cipher

A Capital Cipher

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