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Cracking of the Substitution Cyphers in Classical Cryptography
Kulich, Martin ; Doležel, Michal (referee) ; Stružka, Jaroslav (advisor)
The thesis provides a tool for automatic monoalphabetic substitution ciphers cracking using most common words dictionary. It is based on some previous solutions for english language which were not designed for cracking ciphertext without word divisions. This thesis is focused on cracking ciphertexts without word divisions. It also looks at specifics of czech language - declension and its influence on dictionary size.
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Ciphers in mathematics teaching at elementary school.
BOUČKOVÁ, Kateřina
The diploma thesis "Ciphers in mathematics education at primary school" acquaints readers with basic concepts related to encryption, as well as with the history of ciphers from the beginning to the present, their classification, connection to the framework educational program for primary school and didactic game. It also deals with introducing simple ciphers to children and their encryption and decryption. The work is divided into two parts, theoretical and practical. The theoretical part presents ciphers and their use, basic concepts, types of ciphers, history of ciphers, cryptographic games and didactic game. The practical part includes worksheets and didactic games that contain simple ciphers. Each worksheet contains instructions for use, solutions and the ciphers themselves. Some of the worksheets were tested by children and therefor there is also an evaluation of how the children performed - with the wrong and also correct solutions.
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Cracking of the Substitution Cyphers in Classical Cryptography
Kulich, Martin ; Doležel, Michal (referee) ; Stružka, Jaroslav (advisor)
The thesis provides a tool for automatic monoalphabetic substitution ciphers cracking using most common words dictionary. It is based on some previous solutions for english language which were not designed for cracking ciphertext without word divisions. This thesis is focused on cracking ciphertexts without word divisions. It also looks at specifics of czech language - declension and its influence on dictionary size.
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Methodology for identifying the authors behind initials and pseudonyms in the periodical press
Řehák, Daniel
The methodology first deals with the basics behind the issue in question, which are primarily associated with the creation of a journal bibliography. Initially it defines a pseudonym and initials in a general working interpretation and proposes their classification. It then focuses primarily on initials as the main problem in the identification of authors in journal bibliography. Attention is then paid to several levels of difficulty in the deciphering process (manuals, databases, extracts and archive material) and the usability of deciphering for different types of bibliography. The methodology presents the possible practical procedures for the most rapid identification of the connection between the initials and the name of the author using identification techniques and pointing out the option of an inverse procedure for managing larger sets, i.e. a procedure not from the initials to the name, but from the name to the initials. New ways are also proposed to search for information using full-text search engines in scanned newspapers and magazines, particularly with the aim of providing greater detail for data that has already been acquired. Finally a proposal is made regarding the form of the entries for initials and pseudonyms in summary and database records.
Fulltext: content.csg -  PDF
Plný tet: Metodika šifry - PDF
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