On the left side, in the "Main Functions" section, click the Wand icon labelled "Use the wizard...".
In the "TASK SELECTION" screen, on the left side, click Cryptanalysis, as shown below.
Then click Next.
In the "AGE SELECTION" screen, accept the default selection of "Classic Encryption" and click Next.
In the "ALGORITHM SELECTION" screen, select "Monoalphabetic Substitution", as shown below, and click Next.
In the "MONOALPHABETIC SUBSTITUTION ANALYSIS" screen, some example ciphertext appears, as shown below.
Leave the "Language" set to English and click Next.
The next screen shows the analysis progress. It takes only a few seconds to find the key, as shown below:
Scroll down to see the "Deciphered Ciphertext", as shown below.
In the middle, there is a row of letters in aphabetic order. Click M. Click "Monoalphabetic Substitution Analyzer".
Read about the attacks used, as shown below.
The flag is the first six words of that quote in capital letters, like this:
B WBGG HUBGD T AQOTS WTGG -- TJD JKHKDY HUBGDR WTGGR HOSSOQ SLTJ IO, HOGBOVO IO -- TJD B'GG HUBGD SLOI VOQY BJOXMOJRBVOGY. B WBGG HUBGD T AQOTS, AQOTS WTGG KJ KUQ RKUSLOQJ HKQDOQ, TJD B WBGG ITFO IOXBEK MTY NKQ SLTS WTGG. ITQF IY WKQDR.
I DON'T WANT TO GROW UP
BFNKTAB TM BDD BLHQP MINNR. SHP, GBMPX, LBR-BMM MINNR.
The flag is the first five words of that quote in capital letters, like this:
HintThe text is so short that Cryptool fails. Try finding other tools to use.
KEEP CALM AND CARRY ON