How can I create a random 64 bit key for DEC ECB encryption/decryption, and then use the same key for encryption/decryption many times? All this must be done using openssl command line tool.
In all the examples I have seen, they do not use a "key", they use "password". But I need a key - array of bytes - because I need to send it to the other party (I don't know which API they use for cryptography.)
Then I need to use this key - array of bytes - to encrypt/decrypt data.