TY - THES U1 - Master Thesis A1 - Rothe, Stephan T1 - Symmetric block ciphers with a block length of 32 bit N2 - Subject of the thesis at hand is the analysis of symmetric block ciphers with a block length of 32 bit. It is meant to give a comprising overview over the topic of 32 bit block ciphers. The topic is divided in the examination of three questions. It contains a list of state of the art block ciphers with a block length of 32 bit. The block ciphers are being described, focussing on the encryption function. An SPN-based cipher with 32 bit block length is being proposed by rescaling the AES cipher. The 32 bit block length results in certain security issues. These so called risk factors are analysed and mitigating measures are proposed. The result of the thesis is, that 32 bit block ciphers can be implemented in a secure manner. The use of 32 bit ciphers should be limited to specific use-cases and with a profound risk analysis, to determine the protection class of the data to be encrypted. KW - Symmetric block cipher KW - Block length 32 bit KW - State of the art 32 bit block ciphers KW - Rescaling Rijndael/AES KW - Analysis 32 bit block length Y2 - 2018 U6 - https://nbn-resolving.org/urn:nbn:de:bsz:fn1-opus4-47147 UN - https://nbn-resolving.org/urn:nbn:de:bsz:fn1-opus4-47147 SP - 53 S1 - 53 ER -