Alfred Lichtenstein standing in front of a billboard advertising him and others; Berlin.

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Portrait of Alfred Lichtenstein with his flute; Berlin.

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Portrait of Alfred Lichtenstein with his flute; New York.

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Portrait of Alfred Lichtenstein with his flute.

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Portrait of Alfred Lichtenstein with his flute; New York.

Handwritten dedication signed by Lichtenstein

Alfred Lichtenstein, self-portrait with Hasselblad camera.

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Family portrait with Alfred Lichtenstein, his first wife Gerda, unidentified others (maman, tante, oncle, soeur).

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Alfred Lichtenstein with his daughter Sylvia; Buenos Aires.

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Alfred Lichtenstein with his first wife Gerda and their daughter Sylvia seated on a park bench; Buenos Aires.

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Alfred Lichtenstein with his first wife Gerda; Parque Palermo, Buenos Aires.

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Portrait of Alfred Lichtenstein's second wife Georgette Wegh; New York.

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Portrait of Alfred Lichtenstein's second wife Georgette Wegh; Berlin.

Handwritten dedication signed by Georgette Wegh

Alfred Lichtenstein with his first wife Gerda; Parque Palermo, Buenos Aires.

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Studio portraits of Alfred Lichtenstein with his flute; New York.

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Modified Lu-Lee cryptosystem

A modified Lu-Lee cryptosystem is proposed which appears to be resistant to the cryptanalytic attacks on the original Lu-Lee scheme. The data expansion due to encryption is moderate, and the size of the public key is also quite small.