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Unfortunately, both algorithms are subject to quantum decryption. (Just |
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do a little search on quantum decryption.) |
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|
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> -----Original Message----- |
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> From: Martin Hajduch [mailto:martin.hajduch@×××××××××××.com] |
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> Sent: Tuesday, October 26, 2004 10:40 PM |
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> To: gentoo-server@l.g.o |
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> Subject: Re: [gentoo-server] easy explanation of the strength |
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> of 3DES (and perhaps also IDEA)? |
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> |
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> |
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> hi, |
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> |
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> > easy explanation of cipher strengths so that I could answer |
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> questions |
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> > like 'how strong 3DES is' to novice users. Most results I |
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> could find |
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> > are too technical / mathematical. I want very simple |
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> explanation like |
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> > this: |
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> > |
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> > 128 bit IDEA is very strong cipher. Normally, take a piece of |
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> > encrypted |
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> |
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> 3DES and IDEA are very strong ciphers |
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> unless you are a terrorist, or you have discovered a secret |
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> of perpetum |
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> mobile (or at least cheap way of doing |
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> hydrogen fusion on a mass scale), noone is going to invest the money |
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> required to break your 3DES/IDEA |
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> encryption keys |
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> |
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> on the tech side, 3DES/IDEA are symmetric ciphers, usually |
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> accompanied |
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> by asymmetric ciphers responsible for |
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> exchange of encryption keys (for 3DES/IDEA) - yet another |
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> cipher to take |
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> into considerations |
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> there are some hardware devices able to (tremendously) speed |
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> up breaking |
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> of asymmetric ciphers like RSA/DSA, |
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> so this can be a shortcut to get your message decrypted |
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> (and of course, don't forget known plaintext attacks - or even key |
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> loggers for that matter), if your users are using |
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> windows, they have much much bigger problem there and should not be |
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> concerned by cryptographic strength of |
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> 3DES/IDEA (even ROT13 can be more secure then windows on your desktop) |
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> |
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> > Another question: technically, how does IDEA compare to |
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> 3DES on cipher |
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> > strength and CPU usage? Is 3DES more safer than IDEA and |
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> cost more CPU |
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> > time? |
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> |
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> both are enough secure ciphers with respect to current state of |
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> cryptanalysis |
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> if you want to develop your own app, you may prefer 3DES |
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> because IDEA is |
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> patented (AFAIK) |
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> on the other side, IDEA is faster (current implementation of IDEA are |
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> approx twice as fast as DES implementations) |
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> |
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> at the end of the day, it is not important for users, they are |
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> threatening their own security by clicking on every .exe |
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> attachment they get but of course, no user wants to hear that |
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> HE is the weak link in the chain |
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> |
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> regards, |
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> martin |
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> |
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> |