The Asymmetric Key Package (the successor to PKCS#8) as described in RFC 5958 would be one way to securely move the private key. Russ > On Aug 16, 2017, at 2:50 PM, vaibhav singh <vaibhavsinghacads@xxxxxxxxx> wrote: > > Hi, > I was looking at RFCs for S/MIME, and had a question: What if I am logged into multiple clients(my mobile, a web application, Thunderbird) with an email account, and I receive an encrypted email? > > I can see that the encrypted email would be created with my public key, and, assuming one public key for one email account, I will have one private key which I will somehow make use of across all my MUAs. I could not think of a simple way using which I will be able to sync my private key. > > Is there any good way of sharing private keys across clients (maybe some way of securely syncing files)? How do corporate clients resolve this issue? Is there an RFC which I may have to refer to? > > Another line of thinking; is it possible to create key pairs (triplets?quadruplets?) wherein there could be multiple private keys generated for a single public key? And, what about the other way round? > > -- > > Regards, > Vaibhav Singh