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| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 8 months |
| seen | yesterday | |
| stats | profile views | 1 |
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Feb 25 |
awarded | Informed |
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Oct 9 |
comment |
One time pad key exchange Or both parties are physically present to create or exchange the keys. |
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Oct 4 |
comment |
In layman's terms, how does Shor's algorithm work? I'm not qualified to provide an answer, but the following article may be what you are seeking: arstechnica.com/security/2012/09/… |
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Oct 3 |
comment |
Using SHA-256 with different initial hash value Thanks. I need to read your answer a few times, but this was the kind of insight I was seeking. |
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Oct 3 |
asked | Using SHA-256 with different initial hash value |
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Sep 28 |
asked | How to test distribution of a hash function? |
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Sep 7 |
comment |
Why is the salt used only once in PBKDF2, while the password is used often? I agree - repeatedly injecting low entropy into a hash function just doesn't seem "right". In addition, the last 256 bits of the SHA256 input will be zero (as Ki/Ko are defined to be 512 bits and SHA256 has a 256 bit output and a 512 bit block size); again adding low entropy to the function. If I were to design a PBKDF I'd want to inject as much entropy as possible, but I also agree with the disclaimer. |
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Sep 7 |
awarded | Supporter |
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Sep 7 |
revised |
Why is the salt used only once in PBKDF2, while the password is used often? T is U xor series, not concat |
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Sep 6 |
revised |
Why is the salt used only once in PBKDF2, while the password is used often? deleted 44 characters in body |
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Sep 6 |
revised |
Why is the salt used only once in PBKDF2, while the password is used often? fix loop counter & bytes versus bits |
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Sep 6 |
awarded | Editor |
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Sep 6 |
revised |
Why is the salt used only once in PBKDF2, while the password is used often? Fixed pseudocode |
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Sep 6 |
comment |
Why is the salt used only once in PBKDF2, while the password is used often? Correct. I understand the HMAC construction (which is really more of a workaround to address the length-extension attack weaknesses common to Merkle–Damgård construction hash functions), but the Un = PRF( PW, Un-1 ) construction is specific to PBKDF2. If just happens that if the PRF is an HMAC then the PW (which is typically short & low entropy) is used far more than the salt (which may have much better properties). |
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Sep 6 |
comment |
Why is the salt used only once in PBKDF2, while the password is used often? Danke kind sir. |
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Sep 6 |
awarded | Student |
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Sep 5 |
asked | Why is the salt used only once in PBKDF2, while the password is used often? |
