Encryption Demo

####################
# MD5 Hashing Demo #
####################
mkdir ~/demo
cd ~/demo



mkdir hashdemo
cd hashdemo
echo test > test.txt
cat test.txt
md5sum test.txt
echo hello >> test.txt
cat test.txt
md5sum test.txt
cd ..



#################################
# Symmetric Key Encryption Demo #
#################################
md5sum test.txt
mkdir gpgdemo
cd gpgdemo
echo test > test.txt
cat test.txt
gpg -c test.txt
	password
	password
ls | grep test
cat test.txt
cat test.txt.gpg
rm -rf test.txt
ls | grep test
gpg -o output.txt test.txt.gpg


##################################
# Asymmetric Key Encryption Demo #
##################################

sudo apt-get install rng-tools
	strategicsec

/etc/init.d/rng-tools start

sudo rngd -r /dev/urandom
	strategicsec


echo hello > file1.txt
echo goodbye > file2.txt
echo green > file3.txt
echo blue > file4.txt

tar czf files.tar.gz *.txt

gpg --gen-key
	1
	1024
	0
	y
	John Doe
	john@doe.com
	--blank comment--
	O
		password
		password



gpg --armor --output file-enc-pubkey.txt --export 'John Doe'

cat file-enc-pubkey.txt

gpg --armor --output file-enc-privkey.asc --export-secret-keys 'John Doe'

cat file-enc-privkey.asc

gpg --encrypt --recipient 'John Doe' files.tar.gz

rm -rf files.tar.gz *.txt

tar -zxvf files.tar.gz.gpg

gpg --output output.tar.gz --decrypt files.tar.gz.gpg
	password

tar -zxvf output.tar.gz


############################
# Encryption using OpenSSL #
############################
openssl genrsa -out private_key.pem 1024
openssl rsa -in private_key.pem -out public_key.pem -outform PEM -pubout


echo hello > encrypt.txt
openssl rsautl -encrypt -inkey public_key.pem -pubin -in encrypt.txt -out encrypt.dat

cat encrypt.dat

rm -rf encrypt.txt

openssl rsautl -decrypt -inkey private_key.pem -in encrypt.dat -out decrypt.txt

cat decrypt.txt