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Post Closed as "Duplicate" by Squeamish Ossifrage, Maeher, Maarten Bodewes♦
Corrected grammar
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AleksanderCH
AleksanderCH
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If you have a manual encryption system where the keying is done by extracting a key from a book, a major weakness is that an adversary can search trough all existing books to find a perfect Match and thus the key. But ins tisn't that very theoratical and becausetheoretical since not all books can be accessed by every one on the internet and what?

What can be done to strenghten such a book derived key?

If you have a manual encryption system where the keying is done by extracting a key from a book, a major weakness is that an adversary can search trough all existing books to find a perfect Match and thus the key. But ins t that very theoratical and because not all books can be accessed by every one on the internet and what can be done to strenghten such a book derived key?

If you have a manual encryption system where the keying is done by extracting a key from a book, a major weakness is that an adversary can search trough all existing books to find a perfect Match and thus the key. But isn't that very theoretical since not all books can be accessed by every one on the internet?

What can be done to strenghten such a book derived key?

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user65597
user65597
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How secure is a book derived key and what can be done to strenghten it?

If you have a manual encryption system where the keying is done by extracting a key from a book, a major weakness is that an adversary can search trough all existing books to find a perfect Match and thus the key. But ins t that very theoratical and because not all books can be accessed by every one on the internet and what can be done to strenghten such a book derived key?