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I don't understand the flow of Digital Certificate with Email Encryption and Signing.

For Example, There is 2 users, Sender A and Receiver B.

1.Is Certificate required to encryption to A or just private key is enough? 2.How B decrypt email ? With the certificate of Sender ?

I don't understand the flow of Digital Certificate with Email Encryption and Signing.

For Example, There is 2 users, Sender A and Receiver B.

1. Is Certificate required to encryption to A or just private key is enough?
2. How B decrypt email ? With the certificate of Sender ?

I don't understand the flow for Digital Certificate for Email Encryption and Signing.

For Example, There is 2 users, Sender A and Receiver B.

1.Is Certificate required to encryption to A or just private key is enough? 2.How B decrypt email ? With the certificate of Sender ?

I don't understand the flow of Digital Certificate with Email Encryption and Signing.

For Example, There is 2 users, Sender A and Receiver B.

1.Is Certificate required to encryption to A or just private key is enough? 2.How B decrypt email ? With the certificate of Sender ?

I didn't understand the flow for Digital Certificate for Email Encryption and Signing. How User A encrypt and sign and User on the other end get it back in plain text ? (with public/private key or other method)

I don't understand the flow for Digital Certificate for Email Encryption and Signing.

For Example, There is 2 users, Sender A and Receiver B.

1.Is Certificate required to encryption to A or just private key is enough? 2.How B decrypt email ? With the certificate of Sender ?