@CodesInChaos It is a signature verification function (and the one about "encrypting with the private key" is the generation function). This is the usual historical confusion about signatures, which were first described like that for RSA.
Ken Thompson Hack (1984)
Ken Thompson outlined a method for corrupting a compiler binary (and other compiled software, like a login script on a *nix system) in 1984. I was curious to know if modern compilation has addressed this security flaw or not.
Short description:
Re-write compiler code t...
I am learning network security and I can't understand the boundary line between protocols and algorithms.
Are algorithms the concrete realization of the protocols?
Are protocols composed of several algorithms?
I had recently thought of an extreme way of implementing security by obscurity and wanted to ask you guys if it's possible. Would a person with no access to special processor documentation be able to change the CPU's microcode in order to obfuscate the machine's instruction set? Or is it some kin...
modern CPUs are completely insane in terms of internal complexity
and even the term "microcode" is a bit of a misnomer - there might be different microcodes for individual internal units and some microcodes might map to parts of other codes
and there are delay lines that pull to ground using slightly inductive material that can delay a clock edge by a few tenths of a nanosecond, allowing some clever synchronisation tricks
so it's all about understanding the hardware as well as the logical operation of microprocessors
I have seen this post shows how to detect a Tor connection in php
function IsTorExitPoint(){
if (gethostbyname(ReverseIPOctets($_SERVER['REMOTE_ADDR']).".".$_SERVER['SERVER_PORT'].".".ReverseIPOctets($_SERVER['SERVER_ADDR']).".ip-port.exitlist.torproject.org")=="127.0.0.2") {
return ...
@TerryChia I agree completely. Sometimes going as deep as possible just isn't what people want, or need. Sometimes you just go in a little bit to satisfy everybody's needs.
Ken Thompson Hack (1984)
Ken Thompson outlined a method for corrupting a compiler binary (and other compiled software, like a login script on a *nix system) in 1984. I was curious to know if modern compilation has addressed this security flaw or not.
Short description:
Re-write compiler code t...
I am learning network security and I can't understand the boundary line between protocols and algorithms.
Are algorithms the concrete realization of the protocols?
Are protocols composed of several algorithms?
if (isset ($_POST['login'])) {
$username = $_POST['username'];
$password = $_POST['password'];
$password_hash = sha1($password);
$query = "SELECT id,username FROM users WHERE username = '".mysqli_real_escape_string($link,$username)."'...
I have seen this post shows how to detect a Tor connection in php
function IsTorExitPoint(){
if (gethostbyname(ReverseIPOctets($_SERVER['REMOTE_ADDR']).".".$_SERVER['SERVER_PORT'].".".ReverseIPOctets($_SERVER['SERVER_ADDR']).".ip-port.exitlist.torproject.org")=="127.0.0.2") {
return ...
