In our everyday lives we are often dependent on secure communication, especially in these days of the burgeoning Internet. The tools employed to keep all such information secure requires both cryptography and cryptanalysis. Cryptography studies the principles and techniques by which information can be concealed in ciphers and be later revealed by legitimate users employing the secret key, but in which it is either impossible or computationally infeasible for unauthorized persons to do so. Cryptanalysis is the science (and art) of recovering information from ciphers without knowledge of the key. To communicate securely it is important that we keep on developing new cryptographic systems that can replace and supplement existing systems. This inspired Jimi to introduce and investigate a new cryptographic system, TEX-40, and its applications. He dealt with the security aspects of the system, such as the possibility of a statistical attack and the significance of the key length. Finally, he showed how the system can be combined with the well-known cryptographic system RSA to obtain practical advantages such as low encryption time and effective key management, a method known from the software as PGP (Pretty Good Privacy).

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