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2. Caesar cipher - Wikipedia

   en.wikipedia.org/wiki/Caesar_cipher

   In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet .

3. Cipher - Wikipedia

   en.wikipedia.org/wiki/Cipher

   Edward Larsson's rune cipher resembling that found on the Kensington Runestone.Also includes runically unrelated blackletter writing style and pigpen cipher.. In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure.

4. Magic (cryptography) - Wikipedia

   en.wikipedia.org/wiki/Magic_(cryptography)

   In 1923, a US Navy officer acquired a stolen copy of the Secret Operating Code codebook used by the Imperial Japanese Navy during World War I. Photographs of the codebook were given to the cryptanalysts at the Research Desk and the processed code was kept in red-colored folders (to indicate its Top Secret classification). This code was called ...

5. List of ciphertexts - Wikipedia

   en.wikipedia.org/wiki/List_of_ciphertexts

   Decipher III: Unsolved [2] 1990 Kryptos: Partially solved (3 out of the 4 ciphertexts solved between 1992 and 1999) 1991 Scorpion ciphers [3] Unsolved 1999 Ricky McCormick's encrypted notes: Unsolved 2006 Smithy code, embedded within the 2006 judgment on The Da Vinci Code case Solved within month of publication 2012–2016 Cicada 3301 puzzles

6. Jekyll (software) - Wikipedia

   en.wikipedia.org/wiki/Jekyll_(software)

   Jekyll started a web development trend towards static websites. [5] As of 2017 [update] Jekyll was ranked the most popular static site generator, largely due to its adoption by GitHub. The Jekyll project on GitHub continues to be updated and releases are being made for bug fixes.

7. CAPTCHA - Wikipedia

   en.wikipedia.org/wiki/Captcha

   This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.