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There's a decent overview of it here: Public key cryptography
If you have a program like GPG or PGP, you can use someone's public Key to sign something to verify it's authenticity, or to create an encrypted message only someone with the key's private key counterpart can read. -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2.0.12 (MingW32) mQENBEuegKYBCACytj1HTEcb8l3KauZe7+R/S79k7Uaa1NEqfN8ADrSjmZhSKLX8 Fz+2diZVxAJZdoGsPRUVGJqM72DJeP133XTnMhctIde71I9N49 GMAZnnWi9XDztk INxHyhv7pi9dQpoFN5FAM7GG2X5WFGDOMk3E34ctiLKrmy9P31 UXM9GhyUAyoP4p fjn9+hJr1VWiKO6NLdUBzBCh69ImPRe8rBkq6KsHRlTvPhpJMF J0cWlUt9vRiDht 5cMEeICBOXfWsFTe0G3uIU582To5rklS3aULJs4qor47NNODOf RFaWiucUBdoq5a HJQQ0VHJfoph1CX32Gh5t6q4x/wFqpPg1XX3ABEBAAG0IkphY29iIFJlaWQgPGph Y29iemNvb29sQGdtYWlsLmNvbT6JATgEEwECACIFAkuegKYCGw MGCwkIBwMCBhUI AgkKCwQWAgMBAh4BAheAAAoJEKD9XEaO731gF/4H/R8P+4kMiZNioDZm7CdWUaLR flHd2iC6ePbBDx9MDFGI297rhmywapwVJYw0uWiuNjR0k7JzTM PBswVS0qXRTiSp NXrYglitbiJ022iJXBSk50DaMUx3VUm4a0cbtl1gPy1W4adCDv ElGu032I4Glv4S gDti7V+bPI5gGF3HHFxxMk8Lwo+eXtDMqwAZVXS5mHRLpjv2Oj FSro6YjXpWhqRv 1WGzow2YvldYVbTw3hJWQTO7qbbK0QeeUdI0LX5ctUG4g1+CCZ bLnnG/e0q784K0 kQ9I44bXCvs0SRLWzvamd4m8916Gfd5aqelFGat1L/NpICEV5m95PVtLmJLjpKK5 AQ0ES56ApgEIAKdvHtinW4m0PS7bBxa7oK6BOQQ1Sf9jl9UG8U UbWnevIck6tMoj 6t1bslD9ihjjeZ2/qWTeksfCdq0OVDb4YkDwug/9ZabIF9E3pQ6QY0sgL5rJHf8c Nx63H7Io6gJgZpF7eGeAIXh/JSIVzftViXq5vg8Hfujve/KxeJeZZsahtzvfOY0f iw0Lhk/hN4zO6f/b7XOcckQAM0Glc+kv3hiQkvVkhjiO4Yqy+lAgkCO9/DQ/kWgH kgkzFkm8cf+imUpDEuvUHqLmVO7sXHgRpJriPbSn+DE486aFiN GkBRs9CsYLA7z/ f8aOwNXb6wKF1UqTvzze83k9GMCMVc8qcF8AEQEAAYkBHwQYAQ IACQUCS56ApgIb DAAKCRCg/VxGju99YKsyB/oD6T2jB2IvBOg6+E7iw/HPmlRk8IbWRcMixrdfwk5w R10LxOpmdurLfOXjc9WIUMvXao8KcFIjzevwpoLizolSErfX7J D8yamYBVwm2aMA SCYAtoFw3nqr4VcjoYvMNByLgpD2WhK3ScEVmvYvVD75OFLbpw WgS9f2N4+LBYoU zFLUK4nu6M62YkYueryKY27VQ10KdYv7crNv3kVyNGKcsFsZnf DC319qGB5R2KcE c/jRy3/VNymvwi6npPdGpao+XT9znz7OvG5w3IVKNkQdLq0x6K6cv67dY GxBLHnK MOwx0atr/2eavi6NJKyKRS/uZxoLg2MCrtl4f1re4FKv =eqvu -----END PGP PUBLIC KEY BLOCK-----
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