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Secret key cryptography schemes are generally categorized as being either stream ciphers or block ciphers. The biggest difficulty with this approach, of course, is the distribution of the key (more on that later in the discussion of public key cryptography). Thomsen and Tolga Yalın Josep Balasch and Baris Ege and Thomas Eisenbarth and Benoit Grard and Zheng Gong and Tim Gneysu and Stefan Heyse and Stphanie Kerckhof and Franois Koeune and Thomas Plos and Thomas Pppelmann and Francesco Regazzoni and Franois-Xavier Standaert and Gilles Van Assche and Ronny Van Keer and Loc van Oldeneel tot Oldenzeel and Ingo von Maurich David & Goliath Oblivious Affine Function Evaluation - Asymptotically Optimal Building Blocks for Universally Composable Two-Party Computation from a Single Untrusted Stateful Tamper-Proof Hardware Token Thorsten Kleinjung and Kazumaro Aoki and Jens Franke and Arjen Lenstra and Emmanuel Thom and Joppe Bos and Pierrick Gaudry and Alexander Kruppa and Peter Montgomery and Dag Arne Osvik and Herman te Riele and Andrey Timofeev and Paul Zimmermann Daniel V. Knudsen and Gregor Leander and Ventzislav Nikov and Christof Paar and Christian Rechberger and Peter Rombouts and Sren S. Bos and Hsieh-Chung Chen and Chen-Mou Cheng and Gauthier van Damme and Giacomo de Meulenaer and Luis Julian Dominguez Perez and Junfeng Fan and Tim Gneysu and Frank Gurkaynak and Thorsten Kleinjung and Tanja Lange and Nele Mentens and Ruben Niederhagen and Christof Paar and Francesco Regazzoni and Peter Schwabe and Leif Uhsadel and Anthony Van Herrewege and Bo-Yin Yang Daniel V. As shown in Figure 3, a Feistel cipher combines elements of substitution, permutation (transposition), and key expansion; these features create a large amount of "confusion and diffusion" (per Claude Shannon) in the cipher.
The Advanced Encryption Standard (AES) and Rijndael 5.10. Because a single key is used for both functions, secret key cryptography is also called symmetric encryption. Challenge-Handshake Authentication Protocol (CHAP) 5.15. Secure E-mail and S/MIME Secret key cryptography methods employ a single key for both encryption and decryption.