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Attacked the cipher, and nowadays even with sophisticated computer programs that try millions of possibilities in a matter of seconds. The idea for the encryption methods used came from Ed Scheidt, the former director of the CIA, who probably knew how to make things difficult. To increase the hardness of K4, Scheidt would probably think more like a cryptanalyst, trying to increase the complexity of the algorithm, the size of the key space, or perhaps the plaintext alphabet. An artist like Sanborn, on the other hand, might have a focus that is more visual than theoretical. So he changed something completely unexpected, something a cryptanalyst would never have thought of. Something that computers couldn't find because they can't "see" it.Go to Kryptos - The Cipher (Part 2)[1] Elonka Dunin, Slides - Def Con 12, Jul. 14 - Aug. 01, 2004[2] Craig Bauer, Gregory Link & Dante Molle, James Sanborn’s Kryptos and the matrix encryption conjecture, pages: 541-552, Cryptologica, published online: 27 Apr 2016[3]

IntroductionKRYPTOS - Von Jim Sanborn - Jim Sanborn, CC BY-SA 3.0, I think that KRYPTOS does not need any introduction, I will only give you a brief description of one of the most famous and only partially solved ciphers known today:KRYPTOS was constructed in Nov. 1990 on the ground of the CIA Headquarter in Langley, Virginia by Jim SanbornIt contains 4 ciphers (K1,K2,K3,K4) on its left side and some kind of Vigenère-Table on its right side.K1, K2 and K3 were solved by James Gillogly in 1999. Afterwards, the CIA and later the NSA claimed that they had a solution to the first three ciphers at an earlier point in time.Ed Scheidt, a cryptoanalyst and former director of the CIA, gave Sanborn the input of possible cryptographic techniques to use.K1 is a variant of the Vigenère-Cipher (Quagmire 3) with the codewords KRYPTOS and PALIMPSESTK2 is a variant of the Vigenère-Cipher (Quagmire 3) with the codewords KRYPTOS and ABSCISSAK3 is a Transposition cipherJim Sanborn said that the previous ciphers K1,K2 and K3 contain information that will help to solve the last cipher K42010 Sanborn published the clue that the 6 letters from 64-69 of the ciphertext K4 decrypt to 'BERLIN'. Four years later, he revealed that the characters 70-74 decrypt to 'CLOCK'However, K4 remains unsolved. This post is more of introductory nature, so if you already know a lot of KRYPTOS you will probably not learn anything new.Ciphertexts Below you find the ciphertext of the K1-K4 ciphers: Orange:K1, green:K2, blue:K3, yellow:K4$\small{\texttt{01| E M U F P H Z L R F A X Y U S D J K Z L D K R N S H G N F I V J}}$$\small{\texttt{02| Y Q T Q U X Q B Q V Y U V L L T R E V J Y Q T M K Y R D M F D}}$$\small{\texttt{03| V F P J U D E E H Z W E T Z Y V G W H K K Q E T G F Q J N C E}}$$\small{\texttt{04| G G W H K K ? D Q M C P F Q Z D Q M M I A G P F X H Q R L G}}$$\small{\texttt{05| T I M V M Z J A N Q L V K Q E D A G D V F R P J U N G E U N A}}$$\small{\texttt{06| Q Z G Z L E C G Y U X U E E N J T B J L B Q C R T B J D F H R R}}$$\small{\texttt{07| Y I Z E T K Z E M V D U F K