>>1426657
https://www.theverge.com/2018/5/14/17351684/email-encryption-attack-thunderbird-apple-mail-malicious-code-vulnerable
PGP Cryptocraphic Keys for private communications
http://www.omnisecu.com/security/public-key-infrastructure/what-is-public-key-infrastructure-pki.php
What is Public Key Infrastructure PKI,Confidentiality,Authentication,Integrity,non-repudiation