Linked Questions

110 votes
6 answers
33k views

Why can't I MitM a Diffie-Hellman key exchange?

After reading the selected answer of "Diffie-Hellman Key Exchange" in plain English 5 times I can't, for the life of me, understand how it protects me from a MitM attack. Given the ...
orokusaki's user avatar
  • 1,362
65 votes
6 answers
101k views

SSL with GET and POST

I'm pretty new to security, so forgive my basic question, but does SSL encrypt POST requests but not GET requests? For instance, if I have two requests GET: www.mycoolsite.com/index?id=1&type=...
TomJ's user avatar
  • 753
76 votes
3 answers
29k views

symmetric encryption session keys in SSL/TLS

This question concerns the session send and receive keys used in SSL/TLS protocol. my understanding is that this key uses symmetric encryption (DES, AES, BlowFish, etc.) I'm wondering, if public-...
lurscher's user avatar
  • 1,230
70 votes
5 answers
208k views

Understanding 2048 bit SSL and 256 bit encryption

On DigiCert's page, they advertise a 2048 bit SSL with a 256 bit encryption: http://www.digicert.com/256-bit-ssl-certificates.htm What exactly is the difference here and why are two encryption bits ...
JohnJ's user avatar
  • 867
32 votes
5 answers
8k views

SSH - If Eve has the passphrase and public key, can she derive the private key?

I have used ssh-keygen for creating an RSA 4096-bit SSH private and public key pair. I used a passphrase for the private key. If an attacker, Eve, knows the passphrase in addition to the public key: ...
unseen_rider's user avatar
22 votes
5 answers
47k views

How can I explain the concept of public and private keys without technical jargon? [duplicate]

Possible Duplicate: Principle of asymmetric algorithm in plain english In the spirit of How can I explain SQL injection without technical jargon?, do you have any suggestions on how to explain ...
NickAldwin's user avatar
28 votes
1 answer
25k views

My understanding of how HTTPS works (gmail for example)

I want to ask if my below understanding is correct or not regarding the HTTPS used for the webpage we are visiting. I will use Gmail as an example: My laptop tries to connect to the Gmail server ...
Xianlin's user avatar
  • 409
12 votes
3 answers
7k views

Preventing a spoofing man in the middle attack?

I was humming along with my usual routine of listening to old Defcon videos trying to understand some of the basics of what's going on in the IT Security world, when I came across one explaining man ...
Griffin Nowak's user avatar
6 votes
2 answers
11k views

Is it possible to decrypt a SSL/TLS session without doing a MITM-attack?

I'm not talking about decrypting the connection while the SSL/TLS is happening (MITM) but after the connection is closed and I have a pcap file of the entire negotiation/data transfer process. How ...
YSY's user avatar
  • 2,259
4 votes
3 answers
3k views

Public key in SSL protocol

I have gone through many of the posts including My understanding of how HTTPS works (gmail for example). Everywhere it's mentioning that before creating a https connection, the browser verifies the ...
kevin's user avatar
  • 63
7 votes
2 answers
739 views

How are two systems able to set up a secure SSH tunnel over a public connection?

As I understand it, when two systems create a secure SSH tunnel, the first step involves communicating the 'guidelines' for the encryption of that tunnel. If an third system is able to listen in on ...
Hoytman's user avatar
  • 483
2 votes
2 answers
4k views

Can a wifi provider decrypt HTTPS usind MITM without users noticing? [duplicate]

As a router, can I send forged certificates, and intercept requests to CA and return responses that they are valid. So I could MITM all https traffic, and spy on my users?
Antonio's user avatar
  • 31
2 votes
3 answers
5k views

IPSec VPNs and symmetric keys

When dealing with IPSec based VPNs, I understand that there is a slight "problem" with symmetric key exchange. Obviously, you can't send the keys over the VPN, since they are used to guarantee the ...
SwaroopGiwali's user avatar
4 votes
1 answer
2k views

What would be a simple example of an asymmetric encryption function (asymmetric function)?

I am trying to understand RSA encryption but the algorithm seems quite complex. I know that with asymmetric encryption you use a key and a function to encrypt data and a different function to decrypt ...
yoyo_fun's user avatar
  • 183
4 votes
1 answer
2k views

CSR from IIS 8 and Keeping my Private Key a Secret

I've been trying to understand something. When you generate a CSR from IIS, how is the private key kept as a secret, or is it? Do CA's email you a certificate that includes your private key? Because ...
Alexandru's user avatar
  • 175

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