Public/Private keys in OpenSSL

Question 2

How do you create a private key in OpenSSL?

Answer 2

openssl genrsa -out <fileName> <2048>

Question 3

How do you investigate a private key without outputting the contents?

Answer 3

openssl rsa -text -in <fileName> -noout

Question 4

How do you write the public key associated with the private key to a file?

Answer 4

openssl rsa -in <inputFileName> -pubout -out <outputFileName>

Question 5

How do you encrypt a file called file.txt and output a file called encrypted-file.txt?

Answer 5

openssl pkeyutl -encrypt -inkey udemy-rsa.pem -pubin -in file.txt -out encrypted-file.txt

Question 6

How do you decrypt a file called encrypted.txt and output to decrypted-file.txt?

Answer 6

openssl pkeyutl -decrypt -inkey udemy-rsa.pem -in encrypted-file.txt -out decrypted-file.txt

Question 7

How do you generate an Elliptic Curve related private key?

Answer 7

openssl ecparam -genkey -name prime256v1 -noout -out ecc-key.pem

Question 8

What does pem stand for in pem key?

Answer 8

Privacy Enhanced Mail

Question 9

What does DER stand for?

Answer 9

Distinguished Encoding Rules

Question 10

What is a difference between a pem file and a der file?

Answer 10

A der file does not contain any human readable data like BEGIN FILE

Question 11

How do we get the binary (DER) representation of the keys?

Answer 11

openssl ec -in ecc-key.pem -text