Introduction to PGP Carlos León Skelleftech 23-Jan-2023 Skellefteå, Sweden 

Cloud Native Specialist @ CoreX Social Media: - mastodon: @[email protected] - Twitter: @mongrelion - LinkedIn: https://www.linkedin.com/in/mongrelion/ - [email protected] 

Let’s cover the basics 

The problem 

Ana Erik 

Julius Caesar’s Cipher When Julius Caesar sent messages to his generals, he didn't trust his messengers. So he replaced every A in his messages with a D, every B with an E, and so on through the alphabet. Only someone who knew the "shift by 3" rule could decipher his messages. So starting with ABCDEFGHIJKLMNOPQRSTUVWXYZ and sliding everything up by 3, you get DEFGHIJKLMNOPQRSTUVWXYZABC where D=A, E=B, F=C, and so on. The key here is 3. 

Public Key Encryption Source: Wikipedia 

Systems using Public Key encryption - SSH - PGP - TLS 

Digital Signatures Source: Wikipedia 

What is PGP? From the Wikipedia: Pretty Good Privacy (PGP) is an encryption program that provides cryptographic privacy and authentication for data communication. PGP is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications. Phil Zimmermann developed PGP in 1991.[3] 

Live Coding Session Alert 

What will we cover? - Generate a set of key pairs using gpg - Import someone else’s public key - Encrypt/decrypt files - Sign messages - Verify signature 

Stretch goals - Take private key offline - Generate a revocation certificate 

Sources - https://georgebrock.github.io/talks/pretty-good-introduction/ - https://users.ece.cmu.edu/~adrian/630-f04/PGP-intro.html - https://en.wikipedia.org/wiki/Public-key_cryptography - https://commons.wikimedia.org/wiki/File:Skelleftea_landskyrka_main_view. jpg - Icons taken from Remix Icon under the Apache 2.0 License 

Tackar!