PGP, GPG and AEs

Created: 2022-07-20
Tags: #fleeting

PGP - (Pretty Good Privacy)

software that implements encryption
performs digital signing

GPG -

open source implementation of PGP
also called GnuPG

Both of two methods above

private keys can be protected with passphrases
in a similar way to SSH private keys

private key must first be imported
gpg --import filename.key
then, we can safely decrypt the file now
gpg -d message.gpg

You may need to use GPG to decrypt files in CTFs
IF -> the key is passphrase protected,
THEN -> you can attempt to crack this passphrase using John The Ripper and gpg2john.

AES - (Advance Encryption Standard)

replacement for DES
because DES had short keys and other cryptographic flaws.
AES and DES both operate on blocks of data (a block is a fixed size series of bits).
More info about AES here -> https://www.youtube.com/watch?v=O4xNJsjtN6E

References

112G