1,087 reputation
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age 44
visits member for 3 years, 4 months
seen Dec 22 at 19:30
programs in C and Perl, mostly

Dec
13
comment How to determine which key derivation function used for password?
Do research. You know what system the hash file came from, so you also know something about the software that produced them. Data exists in a context...
Dec
13
comment Bae64 with shuffled alphabet
Most base64 variants will keep a-z and A-Z and 0-9 for consecutive values.
Nov
23
comment How does hash function in Elgamal signature scheme prevent existential forgery attack?
cs.columbia.edu/~zeph/4261/lectures/…, slide 13
Nov
8
comment Why is g is less than p in Diffie-Hellman?
If $g > p$, then it is the same as if we had chosen $g \mod p$, which is $< p$. We are doing all operations modulo $p$. E.g. modulo $p=7$, it's the same whether we choose $g=2$ or $g=9$ or $g=16$ etc.
Nov
8
answered Why do we need to compute message digest of a message first while signing it?
Nov
8
answered Why is g is less than p in Diffie-Hellman?
Oct
20
comment problem with “one time pad”
This is the Boneh Coursera homework exercise, I think...
Sep
24
awarded  Autobiographer
Sep
8
comment Why verify padding at all?
It still leaves the issue of leaking the final byte from the length...
Sep
8
answered Why verify padding at all?
Aug
17
awarded  Yearling
Jul
4
comment Cryptool - DES (ECB and CBC ) - double encyption
What IV did you use in CBC mode?
Apr
25
awarded  Nice Answer
Apr
23
comment Are the MD5 constants an S-Box?
More original than AES was the use of S-boxes in DES. But the term predates even that, I think.
Apr
19
awarded  Revival
Mar
16
answered Cipher Feedback Mode
Mar
16
answered Question on RSA trapdoor permutation
Mar
8
answered Number of possible keys in a Play fair cipher
Mar
5
answered How to decrypt 3DES in ECB mode (using a wordlist)?
Mar
2
comment File Encryption (EFS method)
And, as an afterthought, DPAPI has a mechanism to avoid re-encryption of secrets (like RSA private keys) protected by it, when a user changes its password. This is an added benefit.