network profile
| bio | website | echogtgt.wordpress.com |
|---|---|---|
| location | Rome, Italy | |
| age | 47 | |
| visits | member for | 1 year, 2 months |
| seen | Mar 30 at 13:57 | |
| stats | profile views | 0 |
Old school programmer, I still prefer C over other languages.
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Jun 2 |
asked | Using compression to test encryption |
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Apr 8 |
awarded | Scholar |
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Apr 8 |
accepted | Twofish key length |
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Apr 6 |
asked | Twofish key length |
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Mar 22 |
awarded | Supporter |
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Mar 22 |
comment |
Checking a key before actually using it @Grant: Imagine that the nature of the data is such that, once decoded, the user couldn't tell if it's correct or not before trying to use it (and failing in the attempt). I prefer to avoid the user having to fail to understand that the key was incorrect, I'd like to be able to warn him beforehand. |
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Mar 21 |
awarded | Editor |
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Mar 21 |
comment |
Checking a key before actually using it @Henrick: I've added some more info to better explain what is the scenario. I'm not clear what the user can do to guess the key, apart from trying all the 2^128 keys. |
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Mar 21 |
revised |
Checking a key before actually using it added 1313 characters in body |
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Mar 21 |
comment |
Checking a key before actually using it @HenrickHellström: Yes we may assume that the user is an adversary. It's not a license scheme, just a block of data that needs to be decrypted at a given time. If they modify the cipher text, what would this imply? |
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Mar 21 |
comment |
Checking a key before actually using it The key has to be provided once by the user and is used only to crypt the secret file (and the check file). 128 bits can be expressed with a string of 26 characters like ABBCD-EFGHK-12345-LMNOP-XYZ12-3 which is not too bad to me. I can't imagine other scenarios except the one you mention: the adversary has no access to the key but (might have) read access to the crypted file. What else could go wrong? |
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Mar 21 |
awarded | Student |
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Mar 21 |
asked | Checking a key before actually using it |
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Mar 21 |
awarded | Autobiographer |
