You can reach me via mail at: erik@datenzone.de.
You can also find me on Facebook and Twitter, but please use mail for private communication. My snail mail address is:
University of Twente - Erik Tews Faculty of EEMCS - SCS - Zilverling 4037 P.O.-Box 217 7500 AE Enschede The Netherlands
My GPG public key id is 318D9AD4 with fingerprint 96FE 0966 C732 A196 9C3C  EC93 87CC 0AD0 318D 9AD4
-----BEGIN PGP PUBLIC KEY BLOCK----- mQENBFd6v7oBCADY9FrhR0Ed7AiiIb0ceg/GMiT92vgXUlkJKqK0F3IqRGD7SHwL 8YWyvuEeUpjnmoTHg1r6NZ4cDZJY2UOdCQRBi0ABfA8913AyYgwNDjItg299SNvF 3r5w4rZPqpkBumR8SXPt1oLPnQ3FpYmaUYRUp9C1F3O2i5+eeGYJLz1TriPD4vAV r+0nfaBexvmsXicjwb/SRbScXBvIx0T3SwVMq89iJCmL99nrY2Ak8ULC8UPTa8u6 9+ae7sZKGmcsMgyFtuHlz4XRNafAstRSTMnUK0u3mGawlN9S9FwbimWuLhmwviQq GTujW5QTqw18aOaM2EyBqeMkWS1JR9m+Fvx9ABEBAAG0OUVyaWsgVGV3cyAoaHR0 cHM6Ly93d3cuZGF0ZW56b25lLmRlLykgPGVyaWtAZGF0ZW56b25lLmRlPokBWAQT AQoAQgIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEWIQSW/glmxzKhlpw8 7JOHzArQMY2a1AUCYgOq8QUJECyFtwAKCRCHzArQMY2a1JxjB/0SklfELcLZuwhe 9rZRUODlxwLAyIhQ245QFHUUuCafrISviJeQ8e4RAZ3ULT/ll2fq1kx+JXFJBeCb 2sNMg8rP+NEoeJyp2Tcq7pmdlTJERhe2DEx98SnmTfIa4DyvS785Xf8EctBoCZBk nZCK7u9hDZttm9KRJbSAfsU97Wdl97YHfeaD3M/r5XIQ3JnTh232FpGy5Fk0uCFe 6sTAb4UxoTqwQUmgU4aGKvU1/zxwApXwvS1xr4ga7fZsJodd6R23q+qe6CoQPLVy zF8zPdmH2yuneYCxO9lPsrZqbHFpijzuDx8iIaHmDfFF+M3FhxQI1WbMYzWXwKcw GFQm/OFttC9FcmlrIFRld3MgKEdtYWlsIGFjY291bnQpIDxlcmlrLnRld3NAZ21h aWwuY29tPokBVQQTAQoAPwIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AWIQSW /glmxzKhlpw87JOHzArQMY2a1AUCYgOq8QUJECyFtwAKCRCHzArQMY2a1LOIB/0Z S1ybGkcpJkFzmR0/+dHQPzn4Eej5lzzq96w5R0qyZtj7vswZKuECC6/CTr/Xpuvj iQemCG9LxyevEaKmiWxjDLNZYG7wQVt41sPB35aIWLOWIEk1gYqg0bJ+LinWW/9y pSsh5cIYhMFtksbCDlvNX7BCXAza5i1BTxLi3trGXfnc7HFiCEWOfLV6G4LJ+Zw0 LyAPEzpmrDY+Ts6BOPipGl2xsz4U+ACE0tKGCE8uZZfAdrpHHnH6SeouBZ3XnNeO X59+1TNSEKpOuX2MPmCqutSv4a/dqSfWUkFFq5Lfv8jIS2AFh03wt3yDrcwZzrl3 w0H2cJ2FiuGtZIgNrvP6tEBFcmlrIFRld3MgKFVuaXZlcnNpdHkgb2YgQmlybWlu Z2hhbSBhY2NvdW50KSA8ZS50ZXdzQGJoYW0uYWMudWs+iQFvBDABCgBZFiEElv4J ZscyoZacPOyTh8wK0DGNmtQFAmAqjZw7HSBJIGFtIG5vdCB3b3JraW5nIGFueW1v cmUgZm9yIHRoZSBVbml2ZXJzaXR5IG9mIEJpcm1pbmdoYW0ACgkQh8wK0DGNmtRb BggAmXmjja6tPO+NH6viguzMwu5YoBkl4fCB1JjVrNboy4g6joLbi6VItEC6Hc/I O6GI7afISMYTE3RzMPBIfcIIoB1gikUR5PxNx7EloNeEBIYLfx+yvgiqemA1VmrU 4w2ah6wWl5LT1VQ+fW9L4ODPpJUBjU1C6VgVcShPfElDylbUXO/+/xg2BVMkxVmW /3EDLo+zyJiMc1xtdb1p4GCHRg1DVP7/uCvibkAWTPyrfW65AbCn2fY7QGGEcxgw JKaOQ6mc96FvuTT0N61IBqKG6IL6qqJ4xfcWo0zyrUA2tXosqdHp19YRG0b3QYF2 YVZU8RwFOxBXBJCRgo6zOECQNLRURXJpayBUZXdzIChVbml2ZXJzaXR5IG9mIEJp cm1pbmdoYW0gQ29tcHV0ZXIgU2NpZW5jZSBhY2NvdW50KSA8ZS50ZXdzQGNzLmJo YW0uYWMudWs+iQFvBDABCgBZFiEElv4JZscyoZacPOyTh8wK0DGNmtQFAmAqjbk7 HSBJIGFtIG5vdCB3b3JraW5nIGFueW1vcmUgZm9yIHRoZSBVbml2ZXJzaXR5IG9m IEJpcm1pbmdoYW0ACgkQh8wK0DGNmtQdywf6A+v7obeZ6ugQTm1FhY9xVZ5NOADN OaB4S9Vve16cNHjVB0OkB+lnJ7OEb9SjqDwk1j96ypCEbq2JVe2HZqKIJwefLGJ5 p+MAos3/n9CmCRZn+GjJbhut7XxPJEtfft3u4wHNwH4HZzwNnCOof0ecn7Ev/J8k hu73uTgGUXU0Ch7JP3EzZbr93NmFuTddC6gZGL57bsxebXf7basadqpzYP+fRRao 79O9yo0DiOriyJiplE7BLjYH6bLT1sceMt4B0datBA7Nd1KSlkTu2Xpb5KO5orC5 pqCsxAnrBj8DhKGtG9APTugNOcgg02u8qFA8OtnuZt2h2MZIHwSO8PWmnrRbRXJp ayBUZXdzIChVbml2ZXJzaXR5IG9mIFR3ZW50ZSBodHRwOi8vc2NzLmV3aS51dHdl bnRlLm5sL3N0YWZmL1Rld3NFLykgPGUudGV3c0B1dHdlbnRlLm5sPokBVAQTAQgA PgIbAwULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgBYhBJb+CWbHMqGWnDzsk4fMCtAx jZrUBQJiA6rxBQkQLIW3AAoJEIfMCtAxjZrUDfMIAK+3RnTF+IBoNkGt0L6HOLIY VIDYr0EQsIskVC64CnLSKrnnzMChcydrXnrNDwxvq1CfpkyjFadnruX7FJP3hMgI N9QAMZfq94tfGonTn7Ob3/nQ23lalEFr8D9ZlS2SSXq0zp9HqWWfpIfZ/O0VHc/5 HVeSnQ2usSlYdeNaEb++DFidjUQ7iyVPDXEDEVBPG3lGGIpmYwaGP59r25T8Hjl2 VL6/167BjFgY0fuIfOr7M2FZN5HjroRJhBjavOsKD5eqy992FQ4bYKXqOBV44iUj Vxgrc5urGzlaLF4zdecLy+R1akpTL4qedkGyZdrrPN7fY/UXdvis46adK9pa1VC5 AQ0EV3q/ugEIAM//dijBFDORP+IhCeD/2uo2bem6jTk9nsKZFks8+uArDN+Cmwae MowHNynJfFYaRHMHTnFgHqja4rTgnMbG0lsTxeWN9W0vgbvD93WhWj/spsfSzaZq KZ2VWsWqvxLrAk/T6ZYeZhdTTlpz/7V1BKr1vm5E+FEd4pqwwmm2GYdq2SUw2w9C d64d51vvzLgs/FgzhC+vsKIIF5jpiJLVDBBC4hEZ7u/xLLPrfO7HJvOWePxGOZDX bYoaK+raGr0jJAD7rlVFvj/f/Rc+h1jy081U9CxU0Jwf1NH/fAh/ojbSznAiw4mZ 34SRAOEEWKi0IOxY9Y1CxzrZxVXg39VEsHEAEQEAAYkBPAQYAQoAJgIbDBYhBJb+ CWbHMqGWnDzsk4fMCtAxjZrUBQJgKo4eBQkMcjVkAAoJEIfMCtAxjZrUX+AIAJp6 bwYae6jlZtJEy+41y+118kXvtl9K9jx5fjuM8rdKkNAFECcpaCEmhpD7WrPt9PPp nG3+Q9Cpphi1DZ8SE2uXKsEyni5nSzkOAqb1bwr/yb1B71YNRx8us/Uv1eXC/dgh diOxyhLeB5pG5C1mlKSDzBxLlUwSh6uQIH0SlENwfQFYq82GgVEEta/NgMTwjBNi HKsFtj+EBBzHGKHeUlDYaMPrpLlCpjIe3a4avSE35i0ssXqI5s0zIkB03ydgNyfo xEsnjoIHyPgWgoXzXlK7vUvQIgyAza470i4RAhYc0DSiezu9k5dHOO3yePhsRfwT l+vblDTpBi8NTxATQ3k= =ixm4 -----END PGP PUBLIC KEY BLOCK-----
My old GPGÂ public key id was: 107B0807 with fingerprint 7C7B 2C41 4EF9 F9B9 FC82Â ABE8 D55E ECE1 107B 0807. You may still use that key and accept signatures as valid. However I recommend using the new key whenever possible. As a proof that my new key is valid, it’s signed with my old key.
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1 mQGiBEPIIXARBACgl4cFO+Ylp5tGhx5XXbepksa5aHcCy40W6qaMZCLSSFBNAB6h LdRz1ADZ2x+8mmdv5s+zAmNySpylsauVDxx/Y2BmQnGGzCOmCwS4KU3UNutlRrJn CjXmgXxsDSBZtHj1tWGQbpS81134vgJgL6FpGvEPIMI8p8mSCKYySQwk3wCggel8 ngEoxGlUlKVAYTBQtIdeEYUD/3d/3X40FGgT1FXH5HvPgxAThk1i/aYdxe7MS2py 4xdKxrEH9gwgEQcXbFEzlr8R+ia9vFPXwPTAJ1JKYEq25bu/dKzMNEuhtV8KLkKo 0fXnZVCDsfFUnhyDa8RAsmqNzCKcBJdqwMMHgzjXakuZ+zDKq6i9mRJlFAwYPe/x xYNjBACgfMg0D8HmQ2pJ5hJun/oDcAN7dBvu0jVeQJFDS2fj88e8peEDCqnHDQtP 2p9XS8kwAguMddIvEgoKjB6jQDNylcG6TWLImMkf1C5gYp74cShpA5n6EK3fFASR Vr3b4tAJpoU3wNco/7v3G7p9+4giqfOTbjFakGCcj9XtjZovV7Q9RXJpayBUZXdz IChodHRwOi8vd3d3LmRhdGVuem9uZS5kZS8pIDxlcmlrQGRlYmlhbi5mcmFua2Vu LmRlPohpBBMRAgApAhsDBgsJCAcDAgQVAggDBBYCAwECHgECF4ACGQEFAlSwlxgF CRSq3KYACgkQ1V7s4RB7CAeMdACeNDkXdXRvlL6CiRm2N61cICxQZ3cAn2VRlF9m Iu8MuopwvJac0QUX79F2tHVFcmlrIFRld3MgKGh0dHA6Ly93d3cuY2RjLmluZm9y bWF0aWsudHUtZGFybXN0YWR0LmRlL21pdGFyYmVpdGVyL2VfdGV3cy5odG1sKSA8 ZV90ZXdzQGNkYy5pbmZvcm1hdGlrLnR1LWRhcm1zdGFkdC5kZT6IZgQTEQIAJgIb AwYLCQgHAwIEFQIIAwQWAgMBAh4BAheABQJUsJcYBQkUqtymAAoJENVe7OEQewgH 43AAniP+RtU9NUl/YtIqfnb8bB5PD8NJAJ41lx5MvScNgri3Esbjc6ZnH2T6YrQ3 RXJpayBUZXdzIChQcml2YXRlIEdNYWlsIEFjY291bnQpIDxlcmlrLnRld3NAZ21h aWwuY29tPohoBBMRAgAoAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCVLCX GAUJFKrcpgAKCRDVXuzhEHsIB0GSAJ9lWswFP5c/F07hg2KAO/uiVZHPBQCeIYYy fqVxLHIU3LD9ajn3PoSZm0i0NEVyaWsgVGV3cyAocHJpdmF0ZSBtYWlsIGFkZHJl c3MpIDxlcmlrQGRhdGVuem9uZS5kZT6IaAQTEQIAKAIbAwYLCQgHAwIGFQgCCQoL BBYCAwECHgECF4AFAlSwlxgFCRSq3KYACgkQ1V7s4RB7CAdWugCcDDNDelQLgkM4 eEh7S919wWoNtGEAnAzATM3rnQ0PilbC6aL+3+GWhRoLuQINBEPIIXoQCAD4sXMz zuodKt+eVXEcCO0w5+bP4v807xOeKhzLPTM7EPyGybPfBGn72gxm0K+qrnxXsD1I YZgK50hW8bN+pWFn/AEMTEUf++kuKF1UsujJ/QGi6fhhZ4eVWdakbhVU34sLahIz 7dEQkSIPUjd2uuuqBaPgjwWHtkQafmJQhvEiZojicNArOx8qIFCdY934AwIpOVX1 AKp4m1iz7uj6pmjxsL6jua1C3aDC+IiBWkZu9KwvfZjc22CF5bmQvOFUT11t+Ow7 LwC3fLMLQUakxVPzXC2/aHXbIamNTKpbQK7FctArqkHgHKvrRO9Le8jrBU2P5hA3 IkXr26dzH0sM8rxLAAMFB/9LkQjfCcwBMsCEDe8sHKOEkaGLUDMhHKQRlAZkLZl2 USvgNujuYo9iOm7Llf1zUTfMeHMME4POKXa51j/NweZyVphuSpDzI8l8WgTp0bFD RbnekZuU8HFwN+3m3AmR13WQnN7qK+TFYi6XOLymm5MfT1/PuW+nwXDdsRzmbDb8 Etg0ofp2ubE5Y9qqn3jAjWf/sPRFv+clo49tudMMVuhihWk8wsOIa36KzcNeUm82 vhSRBHvZqeQBPO//A6g2FvAOKkXCEDRmuuC/UvLcfWWBkN3G6DgyBy/X2aWUBaYi o41P43nSrBybRl1iLHXi75xncgbnccpgVNNHjh/gycEuiE8EGBECAA8CGwwFAlSw lwsFCRSq3I8ACgkQ1V7s4RB7CAcYSgCferK9H6TCgiFAkJJclJRjwNVSXiMAnjHV T30iJcTwGE224VQ9yQOaCeFd =eXO9 -----END PGP PUBLIC KEY BLOCK-----
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