By default the expiration of the public key generated via Adobe io is set to 1 year, if you want you can generate a public key using open SSL with a custom expiration like 10 years from outside of Adobe io and upload it.
By default the expiration of the public key generated via Adobe io is set to 1 year, if you want you can generate a public key using open SSL with a custom expiration like 10 years from outside of Adobe io and upload it.