RSA – sending encrypted messages

출처 : https://torstenbuechner.wordpress.com/2013/02/05/rsa-sending-encrypted-messages-from-ios-to-python/

Generate keys with OpenSSL:

The first step is to generate self signed public and private key with a key length of 2048 that will not expire (or at least not within the next 10 years).

openssl req -x509 -out public_key.der -outform der -new -newkey rsa:2048 -keyout private_key.pem -days 3650

You are done and you end up with two files: public_key.der and private_key.pem which are the keys for encryption and decryption.

This command is actually 3 merged commands (but you do not need this)

1) create a private key

1	openssl genrsa -out private_key.pem 2048

2) create a certificate request (follow the prompts to enter information)

1	openssl req -new -out cert.csr -key private_key.pem

3) self-signed root certificate




openssl x509 -req -in cert.csr -out public_key.der -outform der -signkey private_key.pem -days 3650