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Read e-book online Algebraic K-Theory, Number Theory, Geometry, and Analysis: PDF

By A. Bak

ISBN-10: 0387128913

ISBN-13: 9780387128917

ISBN-10: 3540128913

ISBN-13: 9783540128915

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Extra resources for Algebraic K-Theory, Number Theory, Geometry, and Analysis: Proceedings

Sample text

Trusting a key is not the same as trusting the key’s owner. It would be a good idea to keep your own public key on hand with a collection of certifying signatures attached from a variety of “introducers,” in the hope that most people will trust at least one of the introducers who vouch for the validity of your public key. You could post your key with its attached collection of certifying signatures on various electronic bulletin boards. If you sign someone else’s public key, return it to them with your signature so that they can add it to their own collection of credentials for their own public key.

Cryptographic techniques protect data only while it’s encrypted—direct physical security violations can still compromise plaintext data or written or spoken information. This kind of attack is cheaper than cryptanalytic attacks on PGP. Tempest attacks Another kind of attack that has been used by well-equipped opponents involves the remote detection of the electromagnetic signals from your computer. This expensive and somewhat labor-intensive attack is probably still cheaper than direct cryptanalytic attacks.

If you sign someone else’s public key, return it to them with your signature so that they can add it to their own collection of credentials for their own public key. Make sure that no one else can tamper with your own public keyring. Checking a newly signed public key certificate must ultimately depend on the integrity of the trusted public keys that are already on your own public keyring. Maintain physical control of your public keyring, preferably on your own personal computer rather than on a remote time-sharing system, just as you would do for your private key.

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Algebraic K-Theory, Number Theory, Geometry, and Analysis: Proceedings by A. Bak


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