Unlock Hidden Secrets: Deciphering Two Vintage Encrypted Postcards 🕵️‍♂️

#cryptology, #cryptography, #cryptanalysis

This week, we decipher two encrypted postcards which Klaus Schmeh posted in his blog "cipherbrain" :-)

The plaintext language is English. Before you watch the video, and if you are interested in trying to decipher the cards on your own, you find the transcriptions below this description. You may try to decipher these first on your own. Of course, here in the video, I discuss how to decipher the postcards using CrypTool 2.

If you are interested in learning the fundaments of cryptology, let me invite you to have a look at our video series about the basics of cryptology, also for beginners: https://youtu.be/jbumW7Ym03o

You can download the latest version of CrypTool 2 from here: https://www.cryptool.org/en/ct2/downloads

Klaus Schmeh's blog article: https://scienceblogs.de/klausis-krypto-kolumne/four-encrypted-postcards-from-england-part-1/

Transcription postcard #1:

NZ PXO EFBSFTU CPZ
UIJT XGMM NBLF UIF
QBJS GPS BMCVN
GSPN ZPVS HJSM

Transcription postcard #2 (cleaned up):

13.25.-.15.23.14.-.4.5.1.18.-.1.4.1.-.20.8.5.-.12.1.19.20.-.P.P.C.-.6.15.18.-.25.15.21.-.1.20.-.W.St..-.20.8.1.14.11.19.-.6.15.18.-.13.9.14.5.-.4.5.1.18.-.8.1.22.5.-.7.15.20.-.13.25.-.13.15.14.5.25.-.4.5.1.18.5.19.20.-.1.12.12.-.9.14.-.7.15.12.4.-.9.-.6.5.5.12.-.18.9.3.8.-.10.21.19.20.-.6.15.18.-.1.-.2.9.20.-.4.5.1.18.-.8.1.22.5.-.2.5.5.4.-.4.15.23.14.-.20.15.-.19.5.5.-.Cot.-.ton.-.20.15.14.9.7.8.20.-.4.5.1.18.-.8.5.-.8.1.19.-.7.15.20.-.8.9.19.-.6.15.18.5.13.1.14.19.-.10.15.2.-.4.5.1.18.-.7.12.1.4.-.23.5..-.1.18.5.-.7.15.9.14.7.-.20.15.-.W.-.15.14.-.19.21.14.4.1.25.-.4.5.1.18.-.23.9.12.12.-.2.5.-.1.19.-.19.15.15.14.-.1.19.-.9.-.3.1.14.-.20.15.13.15.8.18.15.23.-.4.5.1.18.5.19.20.-.7.15.15.4.-.14.9.7.8.20.-.4.5.1.18.-.15.14.5.-.13.21.38.-.12.15.22.5.-.&.-.12.15.20.19.-.15.6.-.11.9.19.19.5.19.-.6.15.18.-.13.25.-.15.23.14.-.4.5.1.18.5.19.20.-.1.4.1.-.6.18.15.13.-.Yr.-.15.23.14.-.23.1.12.20
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