Public Key Cryptography, OpenPGP, and Enigmail. 31/5/ Geek Girls Carrffots GVA

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Transcription:

Public Key Cryptography, OpenPGP, and Enigmail

Cryptography is the art and science of transforming (encrypting) a message so only the intended recipient can read it

Symmetric Cryptography shared secret key encrypt cipher plaintext decrypt ciphertext

Symmetric Cryptography Examples of symmetric ciphers: Caesar (I cent. BCE) substitution (IV cent.) Vigenère (XVI cent.) Beaufort (XIX cent.) DES (1975) 3DES (1998) AES (1998) etc.

Symmetric Cryptography Problem: deliver the key to the recipient!

Public Key Cryptography (Asymmetric Cryptography) SEC A PUB A SEC B PUB B Alice Bob First, each participant generates a key pair composed of a private key and a public key

Public Key Cryptography Encryption/Decryption (for confidentiality) Alice Bob PUB B SEC B

Public Key Cryptography Digital signature (for authentication & integrity) Alice Bob SEC A PUB A

Public Key Cryptography PKC is based on one-way functions Alice Bob DH-RSA: discrete logarithm problem e.g. 453 x (mod 21997) = 5787 x =? prime factorization e.g. prime factors of 7774733 =?

Public Key Cryptography Birth of Public Key Cryptography: 1976: Diffie-Hellman-Merkle key exchange 1977: Rivest-Shamir-Adleman, RSA cipher 1973: Ellis & Cocks (UK GCHQ) invent PKC, but discovery was classified until 1997!

Public Key Cryptography 1991: PGP (Pretty Good Privacy) 1998: OpenPGP standard 1999: GnuPG / GPG (GNU Privacy Guard) 2001: Enigmail, a plugin for Thunderbird 2014: ProtonMail

Enigmail

Enigmail First operation: create a key pair

Enigmail Public key file -----BEGIN PGP PUBLIC KEY BLOCK----- mqenbffxc8kbcac/oryc2v7uucy0q7bjtm9omzssvk0unl9hh3med3z8jevlrdz9 S4c9Z6SwK+BGL84rG9k2EkY/nYDI/+koBF43QT8LWHHUI1M+wFZ4myquNtUsPsq2 HT32YhoGLfSpKOIxxbniodsDzljR5tzO8Z3oYzNIHj5XKTmVBRDkwgQqODVcvxq8 RlNGR4Z+l1/7NFCRFUQ7fFLO3zSef1shqs5i95Q+QxySfIiGyrw0F59WOC4nrFFL Kt8EhMAs8/c9WGQyWHQubX5PfxKrA+vYhXAtlFwDHQHbZ5VerIhCa15LNkH+WB1A 9DWF/6ocOF1ABMumiXriFdwPLTyLujumtV47ABEBAAG0IERhbmllbGUgUmFmZm8g PGRhbkBlbmlnbWFpbC5uZXQ+iQE+BBMBAgAoBQJRcQvJAhsjBQkJZgGABgsJCAcD AgYVCAIJCgsEFgIDAQIeAQIXgAAKCRCJ1WTtptUNvF0kB/9+fd6v7ExWmq5qx/B1 Iq/NIxgI+dwORBBy89VGV3NexxANOYKQti2y631YVv8s7qWjHzuIlPZ5pKq7OcHd xy8fnttqe92+eyxifmjj7urqilofdomihpzaha4kzsbyzl8ynps1b16lqdhcejf5 7QMXrk2hnVOPIqz/sxt++auTnTlAo/Z6bTkIrour68DCvS4YebIDjyzX2hObFE2T 17PPjuIYrRCyIlAB6U2kxypcRiC3IOLWfDXZrn8Qf/eQ6yt6zpWbc4DC6rZU9HmW IrldsMcCeQsjJVpbzvfWthfQvMwjnXjIcaLLw7obcUOMSIBFhecozRFZCNknU8Hp N/TMuQENBFFxC8kBCACzjNGMEUu5/hX/kRy9cETfmHvy3ntvb0Yq5p317A5poahZ ZFuTGKA3ANy4syAxiYsA+jWk9xB0C8t6sqXtQUP6TjY63p3aKeJcq4SYEMfgKRq6 BZUj56rAkY87yX16PhkByEVK5pthCgfv8nbpCW7sczu0MG2o+mKTgpeuByhLzzS4 xf+wnehi0r5wwx2+aj2bhzt56yf5zocu6twnwipmxpc5bnr9okczgwcke/cqsm9c 7klDQZ2yV4Lbgokik9oU0sWeFr+UDLQxaSClv/l12tJJYyXHDOXlMPeBGkPu6TOC KCjbr1FtKYx/Dc81SL4zoylMLmboGJTljAW2vkD/ABEBAAGJASUEGAECAA8FAlFx C8kCGwwFCQlmAYAACgkQidVk7abVDbxgtwf+Jt7d1YDpcq3Pg/E2l2yCmAttPQbS MIAv0agJax2hSukPWV3zlT8BTE5nXFICxmy6H8mNo2arQMtploC6cr3Brccvyzeq 1JvNmWvVUMeo2pEjJDEFfIqy44vKKVZjoDQfH4ZT3XaXmZu2t3TYpBJjzGCDUFLb thsypu/1xvte+catnlzjbzwldcl7ion6fivxqkjxmyakfbpooe1prixmchbzuxj6 EuDVjy4fZ4U8EScHcj/BKyBO2hwqPbo+iNlhuaZ6JWvWv5T6q8cjTxwK7VZ/ndrm Dk407BwUvG3eWS/kamvmBLYbCIPye+GBLvpGBXNCgkUi+iLb73e1pG8eiw== =JEo8 -----END PGP PUBLIC KEY BLOCK-----

Enigmail Private key file -----BEGIN PGP PRIVATE KEY BLOCK----- mqgibegn3cerbac+2os2hoacip4eikxezv+ivhowaznojigzy9zy4y8c0bhup++q ccgo9vgno1vixapyvjctwx9hfjiendlsbrwor69hpbabdo+3bbokwjfygq8akynv tbcodcnfofwqs/8xdoh25/oig+ujkhgxwkjkdd1ucj7shdgioxovjo13xwcgzrga k2oa9bne3hw+jupjjlu4ubkd/i7mbqffwtgxcxfrfsvdnkmpc+qvke00ajfrp31o DbRCRL4GZCFTx4/DFy1jYbgYwl6MoCtSlufca3v5jpZbRgtKndcnlrauJO16EURs LovKAJEkeCIcbTJTwnxMxCapTWhqIaitumZ6davIvV93UcDnQfYiCASzE5q/MD8L lqsla/9rvqoiawzlq+mal0maebtgee7ydtx08ia1h3mevxvjwuhpv54atwirbkfn MFzkiFyUvQ5w3TwX8Fn17cuQNpCXTh00iG30GuZVl1aOl3fQXU/c9+vw2Rb0gvDF BBlsnZ0MQns5bt6azIcLW44FzO2NKiK6/Y2XTiDVhtSAihTWLrQmRGFuaWVsZSBS (...) LunxO87fZF+JOoxs9F0IweA2nb1ga7fQ4Ud20ZVKfE4+vGCV5KXRNcOPbJL+vzuD I7dMD+T05X8kK2x2HsaURdpKOZVhAuHIzEqn7E1UnUXnm4nVXg2bkAkBPQdfd97D 3bRLiE8EGBECAA8FAkgN3cECGwwFCQlmAYAACgkQW9ZLGa9iatRGlACeIyyIBTGj wba7+lhvnlqaokbrunotayaqzd7vookwkiz+nplf =ve7c -----END PGP PRIVATE KEY BLOCK----- Do not distribute your private key!

Enigmail

Enigmail

Enigmail

Enigmail

Enigmail Your keyring contains all your collected keys

Public Key Cryptography Check a public key s fingerprint to ensure that it belongs to the correct person

Public Key Cryptography How to obtain someone s PGP public key: by hand, via e-mail, from website, etc. from a keyserver via Web of Trust / key signing parties from Web Key Directory

Public Key Cryptography Other uses of PKC: SSL/TLS (HTTPS) secure IM: WhatsApp, Signal, etc. digitally signed software SSH S/MIME email security

Public Key Cryptography Different techniques for key authentication S/MIME, HTTPS, signed software: public key is embedded in a certificate issued by a trusted CA SSH, secure IM: trust on first use (optional fingerprint check)

Public Key Cryptography Thanks for your attention!

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