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Encrypt user name and email or not?
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À
15/09/2010 10:02:19
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
01481002
Message ID:
01481263
Vues:
32
>>>>
>>>>Can you see, by looking at an entry in a column, if the entry is encrypted with some cipher code or hash?
>>>
>>>
>>>I was just pulling your leg - but to answer the question
>>>
>>>(1) a hash is always the same length (eg md5 hash = 16 bytes or 32 hex chars)
>>>(2) encryption without block cyphering (eg rc4) : the lengths will vary
>>>(3) If you use block ciphering, the lengths will vary depending on the length of the password, but all lengths will be a multiple of the block
>>>
>>>So, looking at the lengths of the encrypted passwords
>>>
>>>- if the length is constant, it's likely to be a hash
>>>- if the lengths are a multiple of something (not 1) it's likely to be a block cipher
>>>- otherwise it's encrypted, but not with a block cipher
>>>
>>>I case of passwords - since the lengths are small - it's difficult to distinguish between hash and block cipher
>>>
>>>
>>>see http://en.wikipedia.org/wiki/Block_cipher
>>>http://en.wikipedia.org/wiki/Cryptographic_hash_function
>>>
>>>Post your encrypted passwords and let me guess
>>
>>Thank you for the explanation. You must be doing work with either banks or Interpol since you know so much about encryptions <g>
>
>
>I have written an AES128 encyyption in C#. You know a couple of things once you have finished that

I am impressed.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
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