asymmetric cryptography

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Presentation transcript:

asymmetric cryptography by David Kumar

Content What is a asymmetric Cryptosystem? How Public Keys can be trusted GnuPG Creating Key pair Handle the keys Thunderbird Questions?

Review: asymmetric cryptography Public Key Secret Key Review

How Public Keys can be trusted Authority Infrastructures Public Key Infrastructure (PKI) Financial transaction Cross certification Company's Web of Trust GnuPG Review How Public Keys can be trusted

Public Key Infrastructure Often used in combination with Hardware Review How Public Keys can be trusted

Cross certification Review How Public Keys can be trusted

Web of Trust allows anyone to sign anyone else's public key Review How Public Keys can be trusted

GnuPG Under GNU General Public License Web of Trust Command line Tool But there are some GUI’s for: Instant messaging Email Etc. http://www.gnupg.org/ Review How Public Keys can be trusted  GnuPG

Creating Key pair gpg --gen-key (generates the sec. and pub. key) Algorithm: DSA/ ElGamal Key length 1024 – 4096 bits duration of validity Valid for ever Valid for specific time: days, weeks, month, years Personal Information Name, Email address Passphrase Review How Public Keys can be trusted  GnuPG

Creating Key pair Digital Signature Algorithm ElGamal (al-Dschamal) Based on Diffie-Hellman: Review How Public Keys can be trusted  GnuPG

Example GnuPG Key Review How Public Keys can be trusted  GnuPG -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.7 (MingW32) mQGiBEdXIhgRBADTv+EasL+ZVWbkb42eq37vNNmXD8JoNFCCaDrCdZmLrFc2S4Pq Wb63jmtlaZ0QG9BG8RcMxo7fPeoUZu1W6abHm29b+E1cDqBp8RdTrcRcbMnW9A5w Yrfga5Rc5f3eL9rRGcddq2zoSf86jNjoJoAuJWP20dPTTG7RtaqSazH12wCg1A8I MOrirxgsl/rxaNr+UoAUOykD/iOXD3jVIiLgGQi2pAgJlHANrtOj13FoUWLVYbuR QT+Sy6FI5uHxopYaj7B2FydWFeBZh16dtaFT0v5zR8auEDA7EIG0WldkmdRBo115 IS7MpSX6WGqoaRCH9sW/UO1Qz+ZEjSZ8T7nQTGvsa/pNmQQyIArTpf04gAfl+W2C kQ0lBADTuw90GAyNZBkgmYrJNFLjbMX/ogsmscuymHeTBMVTcN56EIQ4B09D6aq2 wQHDjBeEdSOUxnxGyq9yPiNjjzsZ/D3o51VFpITy57xvkWCmlflU9OJ/AF3mgYz+ rXxkHeuRzNR2oOfyDTGxD8hF5qXNsXxRuJzANgDqz9aflzBW07QkRGF2aWQgUy4g S3VtYXIgPGRza3VtYXJAY2xlbXNvbi5lZHU+iGAEExECACAFAkdXIhgCGwMGCwkI BwMCBBUCCAMEFgIDAQIeAQIXgAAKCRAwvq2f1WC3UrIpAJ4z4cO46tiq7U+wQQ1U JVeJWIMxBQCfRy9W+q/RNIIaOLFK7h+Lh/hGXle5Ag0ER1ciGBAIAMkRCgBtzkvM 3TQ/Boxwgzoy6w6gxOJQAArKKww+cI3FPEAp5LaZ3xlCgGIPTetJrIk07hBkdrxn MECTaQSTzsnwrBmkmwqJ+QCRZ7VNEwTHg2l5P5ag3fsVZUde77lcw9YXQ/U06aQy KHLw3urdy9tZNAf8lTneV1ySRug7EXhceJvGKOQGbpd/y8nxkSoiccGqtJixcDf+ 0T+UZ+AvG2nt62sDpknj06xP5L/IaFiordD4xse3dHfLkwCl6MT9FIy1i+GSTHTh Mji3/m+UMOzO3iPgDdiwXEG9NcCYN5ZdWauOmxzXi4963FFu8tTS9lrEJoBWnUvz V7VqQAqe1gcAAwUIAJG4J8VW8gNNMgLTRu8UliZptaPXVibqz7FvPNI1BcvxjUUg XjVLsuo1BtBgzt+CIDVbheIZdwJyEADoWW/szBbusWANVtH/oGrZHA7afJz4IfAq OBzk1Alo26LrPL2sqP4iaOvzQxO6PF4m4gGmzgkV+IKfG80fpUwiKGD1W9pLrvY9 h2+9h5bxqld+ojU3qa+E1GwYSNlyb8s/4t2u7V83+UaUXXiAq+YLABWGnVvkq8oZ juYiAm6W8pqt+6bF96szWx8L7Yr/72GFfFFX4ME9Q8IY8StLtttlUKb8dom2R5sI 4O5G5Lv9rd0qYL0r55ScXvR2r2kesVfpYhp+8AKISQQYEQIACQUCR1ciGAIbDAAK CRAwvq2f1WC3UudMAJ43HZzBbzMPSGXTkpvxnzRu3hl5jACdF3yjHtcvi6AUVD43 njN97QZLRu8= =6ABD -----END PGP PUBLIC KEY BLOCK----- Review How Public Keys can be trusted  GnuPG

Key Export / Import Export: Import Show all keys: gpg --export [UID] –o filename Why export? Import gpg --import [Datei] Why import? Show all keys: gpg --fingerprint Review How Public Keys can be trusted  GnuPG

Signing a Key gpg --edit-key UID Be careful to sign Keys! sign Review How Public Keys can be trusted  GnuPG

Thunderbird Enigmail Thunderbird Add-on: for GnuPG Review How Public Keys can be trusted  GnuPG

Enigmail Review How Public Keys can be trusted  GnuPG

Thunderbird Review How Public Keys can be trusted  GnuPG

Thunderbird Review How Public Keys can be trusted  GnuPG

Questions? Review How Public Keys can be trusted  GnuPG THE END