Pretty Good Privacy (PGP) is an encryption system used for both sending encrypted emails and encrypting sensitive files. Since its invention back in 1991, PGP has become the de facto standard for email security.
Since PGP uses both symmetric encryption and public-key encryption, it allows users who have never met to send encrypted messages to each other without exchanging private encryption keys.
A guide to using PGP encryption can be found here. For those wishing to send an encrypted message from outside of ProtonMail, my public key is available below. Messages between ProtonMail accounts are encrypted automatically.
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: OpenPGP.js v4.10.4 Comment: https://openpgpjs.org xsBNBF7fpskBCACgSCmqwfpRFw7EqjJsQnusm42xoeJWEuyV3ysIL5eYdm5v ZWMLUye1Duia3AQZk8EuDewJrbAhy1yfOLV1KUoBR4ZdXebIlpoiQHxInis5 hmDLMlEMZ508ga/ad6oma93nS+07YZN6iAbzsTaChlhx543N5Tt6o3VitTw0 sr9VESPEa3N3ovfD+YS/CBp58Qk33d5PCCtkn/25WD3EiqInLsw368qH2ETv Yupwl7eM2qWQ0MIc9VGUoKQXrW/Cy+mSNqqY9TrKDMO6pwStMzD4Gwewljjs R30C7VwIin6tN3zC8DKf5sOVrpejPU0zaj6OI0lkhE/6MVfiCbwJsIXJABEB AAHNM2Nyc2Rhdmllc0Bwcm90b25tYWlsLmNvbSA8Y3JzZGF2aWVzQHByb3Rv bm1haWwuY29tPsLAdgQQAQgAIAUCXt+myQYLCQcIAwIEFQgKAgQWAgEAAhkB AhsDAh4BAAoJEId8oyRlcMit9OcH/0wajhxaw+dxA5V/sfeL6VlhidnlJjtK OPFSIKVMeyUvSeL8+4o44f/bI/NwfTKfJ9g/ve805G/k7O258XpTWEt5ntee SSiEh7Div+X6N01xBufUbWL5M7VmwmXOhe20TICpUII2ayJuDQVYJbZFma6a F1YVWHW+flT9bB1zlP4uKb4GjPxqpvyW36mMoIqUrh1cY3Rse4anHt0Kuh0i RzDEBRNi8wEu6/RvnLQYyTn3S4Ihkg9p8MTnKg+HqeuMjMGqRsbxKuwFHI9a gZPLIl/AA2M8wAh1z6wzjfcAD5dLQJXLdP2sgPIANCDAbN0ScR5K+0phDfO4 ExhO20GMS8TOwE0EXt+myQEIANmCuV3xBEbYsKs3WxgrIXv/s9X55HfNUrkH mhS3exA9nJ0ofpYGxjNfRvO/LJ0dqAm1Jltq0OheqgUK2JwHriIDIs0bz3gi YRBADP7qQ9lUNX0Oo/V0milGNpRc2bZE2TlEtzLcjgviHzZ29zbdOJUeGooH BO2T4m+PE6zqKalpLeVZnbN69JoKczoWXllnSQjf/u+QqZJK4WTRd7LPehnz GamUFrvUBPJzTn5tMoz+0A3o8xWIlrNV/uXrGzvxtK8WHjs9tybPlwoL1xsI jXKM8lTQ5j8CT/q7ICakS0LbR4yf3KIrVCOBvCPlubGu1CYWg0o1vWbr4RhJ FhvH068AEQEAAcLAXwQYAQgACQUCXt+myQIbDAAKCRCHfKMkZXDIraU6B/9h npCPKzLa+EfWEWxaRihsTkFU2FDO0Gm6gI44sjEfVKL9c9Zry+SnJu6xK/G/ FxE8qCDyWAIqkjedeQiN1lJWi+yaQgeEJi13vGvAbmFf9R50vZzEwLpjMYK8 5JktYt1B82DaKSfmXmmpJJBdfZExD3Jb2AFSQkbO8/vBWUlm9W9rHw8g6sqg qGb3nl5jaSxdq7MdNBbg1+6Kd9rIT0KN0Fzc+LlJFRDZ11PYnzRdyHEM02dW PrEX3q0UMBT4u9bwq2aNn/Dmyr5yNWyVZ/3u8tvOLwK3BY01pBQlCMNL09c/ uMCYhtGK1lh6Y8NjcZn6x3MoAoKOQ6EFI6F8XInG =pp2Q -----END PGP PUBLIC KEY BLOCK-----