## Encryption – Public key asymmetric cryptography: Can a key be used to encrypt or decrypt?

I think you mix the terms. Unraveling them can help your understanding. (In the order you used them):

Key exchange is one of the many methods to take a symmetric key that you own (eg an AES key) and exchange it with another party, so that no one can learn it at the same time time.

Key exchange and encryption are (almost) unbound concepts. The key exchange is often done using asymmetric encryption, but there are key exchange methods that have nothing to do with encryption.

Public key / private key encryption and digital signatures: you're right to say that with encryption, you encrypt for the recipient's public key and then they can decrypt with their private key. With signatures you sign with your private key and then everyone can check with your public key.

Trying to generalize it as you did has quickly become complicated because there are many asymmetric encryption algorithms (or "public keys") (wikipedia):

Examples of asymmetric key techniques known for a variety of purposes include:

• Diffie – Hellman Key Exchange Protocol
• DSS (Digital Signature Standard), which incorporates the digital signature algorithm
• ElGamal
• Various elliptic curve techniques
• Various password-authenticated key agreement techniques
• Cryptosystem of Paillier
• RSA Encryption Algorithm (PKCS # 1)
• Cramer Crypt – Shoup
• Authenticated key agreement protocol YAK

Examples of asymmetric key algorithms that are not widely adopted are:

• NTRUEncrypt cryptosystem
• Cryptosystem McEliece

Examples of noticeable but unsecured asymmetric key algorithms include:

• Merkle cryptographic system – Hellman backpack

There is a similar but different list of digital signature algorithms (also wikipedia):

Some digital signature algorithms

• RSA-based signature schemes, such as RSA-PSS
• DSA and ECDSA elliptical curve variant
• Edwards-curve digital signature algorithm and its variant Ed25519.
• ElGamal signature scheme as a predecessor of DSA and Schnorr signature variants and Pointcheval signature algorithm – Stern
• Rabin signature algorithm
• Schemes based on matching such as BLS
• Undeniable signatures

You will notice that RSA is the only algorithm on both lists, that is, the same algorithm can be used for both encryption and signatures. The RSA signatures work, as you describe, as a hash of the message that can be decrypted by the public key, but this description does not match any of the other signature algorithms in the list.

To answer your question "Should I think of asymmetric keys along the lines of a key encryption and the other decryption or can we use a pair to encrypt or decrypt?", the answer is "It depends on the algorithm you're talking about."

What you say in your question is true (for the most part slightly simpler) for RSA, but certainly not for any other asymmetric encryption or digital signature algorithm. It is better to consider them as four distinct cases:

• The public encryption key
• Encryption of the private encryption key
• Signature of private keys
• The public key signature checks

and know that the details of its operation vary enormously from one algorithm to another.

## java – unable to access the public method in main. (JFrame)

I have 2 classes:

The user interface has a button and a text box.

The goal is to have the main printed text in the text box when the button is pressed.

HOW TO TRY TO DO IT (Sudo code):

``````The user interface extends JFrame {
boolean tf = false
TextArea ta = new TextArea ();
JButton b (event e) {
tf = true
}
getTF () {public boolean)
return tf;
}
public String getTextArea () {
return ta.getText ();
}
}

main {
public static void Main (String[] args) {
JFrame ui = new user interface ()
while (true) {
if (ui.getTF () == true) {
System.out.println (ui.getTextArea ())
}
}
}
``````

The problem is Main does not see the getTF () and getTextArea () methods in the UI class. I imagine that's because it extends JFrame.

Is there a better way to do this (without combining the UI and Main classes)?

Is it possible to somehow access the BTC?

You say that the BTM used a public key as a bitcoin address. This should not be possible, but it may be a flaw in the BTM software.

You can not access BTC associated with a bitcoin address for which you do not have a corresponding private key.

You can not generate or discover a private key from an address

If what you say is true, this amount of BTC has reached the 20% of all BTCs that are lost forever.

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.

## As an end user, what are the risks associated with browsing a public website using TLSv1?

Is it safe for an end user to browse a Web site that only supports TLSv1 (or other unsecured encryptions or protocols), in the following cases:

• it is a publicly accessible website without sensitive or private data
• it does not require connection, login, or other user data.

### So, for all intents and purposes, let's assume that the website is meant to be a `http: //` site, but has an SSL certificate that is obsolete by modern security standards.

And by safe, I mean that they're not open to a type of exploit, other than MITM of course. By exploit here, I mean that there is no way to use a bad SSL certificate to install malware on their computer, right?

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## The contents of the field do not appear in public view

I have not built the website and I am new to Drupal.

I was asked to add a new field to an existing content type. I added the field and it appears on the form for this type of content, but the data entered in the form does not seem to be passed to the public view.

The site is Drupal 7 & uses Views. I do not think that it is the module of the views which poses problem, although I played a lot with it and that I especially learned how it works. The reason I do not think it's the views module is that when I look at the page with the tabs "Show" "Edit", it does not appear either.

## Why can I use 2 different private keys to connect to my SSH server storing only one public key?

On my server `~ / .ssh / registered_keys` contains only 1 public key. However, I can connect with 2 different private keys.

A private key looks like this:

—– START THE RSA PRIVATE KEY —–
MIIEoQIBAAKCAQEAqaO1eFD6XTTbmcItrptJxRJr89oW2gwlFU0tt8oF / 6ZbOfV9

p1RjkISOfKl7YEElZEBHsl / ikCgv2C8DIOTTknXYDXeIxi / PMg ==
—– FIN RSA PRIVATE KEY —–

The other private key looks like this:

—– START THE PRIVATE KEY OPENSSH —–
b3BlbnNzaC1rZXktdjEAAAAACmFlczI1Ni1jYmMAAAAGYmNyeXB0AAAAGAAAABDwMB0nEv

LlI3s =
—– PRIVATE KEY FIN OPENSSH —–

Why?

## Is it dangerous to connect to an unsecured public wifi network for a few seconds before connecting to a vpn?

It might be common sense, but I can not understand. I bought a VPN subscription for security reasons (I travel a lot, so I am dependent on public wifi networks). I have configured all settings to connect automatically.

Let me take you to the usual wifi connection of my public library:

I turn on my laptop (Windows 10). I see on my login screen (lower right corner) that the laptop is already connected to the wifi network. I type my password, I connect to Windows and the vpn desktop application takes a few seconds to open and connect.

What I ask is: During the time (about 30 seconds), the computer starts, logs on, turns on the desktop vpn application, actually connecting to the vpn, is my laptop exposed? I do not do anything until the VPN connects. The only thing that could happen is that Windows starts downloading the updates in the background.

Am I paranoid or is it a legitimate concern?
Thank you so much!

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Evaluation: 5

.