Weak Keys System Check - Small Exponent

How to prevent Small Exponents

One parameter in the openssl rsa keygen commandline effects the exponent generation

openssl genrsa -aes256 -out test5.yourdomain.tld.key -3 2048

instead of parameter -3 use -f4

openssl genrsa -aes256 -out test5.yourdomain.tld.key -f4 2048

builds exponent 0x10001