19,884 reputation
23291
bio website
location Brooklyn, NY
age 33
visits member for 3 years, 3 months
seen 4 hours ago
Good Morning how are you, I'm dr jimbob
I'm interested in things.
I'm not a real dr,
But I am a real jim bob.

Have a PhD in Experimental High-Energy Physics, but left academia in mid-2010 to program professionally.

Mostly program/script in python, django, and jquery these days doing mostly web apps.

Also have experience programming in C, C++, java, haskell, php, and (bash) shell more in the past.

Linux as primary OS since 1999, ubuntu user since 2005 (Hoary).


1d
comment How does signing work with Elliptic Curve Crypto?
-1 for misinterpretation of equivalence of RSA / EC / symmetric key as needing a 512-bit EC key to encrypt a 256-bit symmetric key. (The equivalence is from the best known attacks; brute forcing an ~15000-bit RSA key with GNFS would take about 2^256 work as would brute-forcing a 256-bit symmetric key for an idealized symmetric cipher; you can easily encrypt a 256-bit symmetric key with a 1024-bit RSA key). Also as dave_thompson_085 pointed out, your answer doesn't really answer the questions or distinguish key exchange from signing.
1d
comment Can anyone recognise this sudden influx of malformed HTTP requests?
Are these requests always from Windows User Agents? Your question and the stackoverflow question both only list windows user agents (from Chrome, Firefox, and IE11).
Aug
20
revised Are digital signature algorithms subject to the same types of attack as public-key encryption algorithms?
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Aug
20
revised Are digital signature algorithms subject to the same types of attack as public-key encryption algorithms?
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Aug
20
answered Are digital signature algorithms subject to the same types of attack as public-key encryption algorithms?
Aug
20
comment Can HMAC leak the password?
@Gilles - True. One obvious example of an easy to invert, non unique function (by not unique I mean not injective) is sin(x). If I ask you for to solve for x in c = sin(x), you can easily find all solutions x = {2n pi + sin^-1 (c), 2(n+1) pi - sin^-1 (c) } for integer n.
Aug
19
answered How to Conceal/Detect PGP Symmetric Algorithm Used
Aug
16
answered Where are passwords hashed?
Aug
13
comment Why is a CSR hashed?
@user53029 - Originally, MD5 was used. But MD5 has vulnerabilities specifically chosen-prefix collision attacks. So an attacker first carefully constructs a collision between an unsigned certificate m for a random domain and a fake intermediate certificate authority m', such that MD5(m)=MD5(m'). Then they get a CA to sign the first certificate, and take that signature and append it to their other certificate and now they can sign anything. Hence, you don't use MD5 for signatures anymore and SHA-1/2/3 should be more secure.
Aug
13
answered Why is a CSR hashed?
Aug
11
comment How to convert http site to full https?
Voting to reopen. I agree detailed step-by-step instructions on how to get a certificate from a specific provider or step-by-step configuration changes necessary for a bunch of specific webservers would probably be out of scope, but a general how to set up an HTTPS seems very in-scope here. It's a problem people actually face, many people do it incorrectly, and while say superuser or another site may get an answer that gets you up and running with HTTPS, it may not be configured securely (e.g., allow weak ciphers, leave in HTTP links/embedded resources, not test your setup).
Aug
10
comment Is MS Windows more secure than Linux on this aspect?
Agree, you should never rely on obscurity for your security. That said, obscurity often doesn't hurt (sometimes comes at expense of usability) and helps as a default when users pick bad passwords. Guessing a user name from M possibilities and password from N choices is a tougher task, means it takes MN work instead of just N. Yes, your username often is not secret in a targeted attack (where they have usernames associated with your IP address from other systems), but there are plenty of non-targeted attacks out there (leave an ssh server on port 22 facing the internet and see the attempts).
Aug
10
reviewed Approve suggested edit on Is MS Windows more secure than Linux on this aspect?
Aug
10
comment Is MS Windows more secure than Linux on this aspect?
@JimiDini - Well you can switch to the root account with sudo su -, it's just when the password is not set, you can't login to the root account by knowing an unset root password. @Parithian Shot, I agree in the Kirchhoff principle in general, especially for analyzing security of a system. Granted in practice, it often drastically cuts down on crud in your logs if you do simple restrictions (change SSH from port 22, don't have a user named root or other common names).
Aug
10
answered Is MS Windows more secure than Linux on this aspect?
Aug
9
answered How to convert http site to full https?
Aug
9
answered Do DES keys have to be random?
Aug
3
revised Ip4v Rainbow Table
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Aug
3
revised Ip4v Rainbow Table
added 142 characters in body
Aug
3
revised Ip4v Rainbow Table
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