cryptographic algorithm SSH Juniper SRX3400

Hello,

my customer have question for SSH in Juniper SRX3400.

"Guidance for cryptographic algorithm and key lengths when performing remote management of network devices s, (e.g., transition to 2048-bit DH modulus for SSH key agreement and 2048-bit RSA certificates for SSH authentication)."

i not found documentation about it. any have information about it??

Thanks.