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Concepts 1.1 Public Key Encryption. Classic methods for encryption only use one key for encryption. The sender encrypts the message with this key. To be able to decrypt this the receiver needs to have this very same key.
This key must have been given to the receiver in a way, that others won't have had 5 opportunity to obtain this key.
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Gnu Privacy Guard GnuPG Mini Howto English : Concepts Previous Classic methods for encryption only use one key for encryption.
The sender encrypts the message with this key.
To be able to decrypt адрес страницы the receiver needs to have this very same key.
This key must have been given 5 the receiver in a way, that others won't have had the opportunity to obtain this key.
If somebody else по этой ссылке have the key, this method of encryption is useless.
The use of so-called Public Keys can solve this problem.
Public Keys is a concept where two keys are involved.
по этой ссылке key is a Public Key that can be spread through all sorts of media and may be obtained by anyone.
The other key is the Private Key.
This key is secret and cannot be spread.
This key is only available to the owner.
When the system is well implemented the secret key cannot be derived from the public key.
Now the sender will crypt the message with the public key 5 to the receiver.
Then decryption will be done with the secret key of the receiver.
Crucial in this concept is that the secret key remains a secret and should not be given away https://produkt.space/karta/pd100i-modeli-1h1-datchiki-povishennogo-kachestva-dlya-osnovnih-proizvodstv-oven-preobrazovatel-davl.html become available to anyone else but the owner of this key.
YOU CANNOT SEND THIS KEY OVER THE INTERNET.
Also it is very unwise to use GnuPG over are Интерактивный ИБП Gembird EG-UPS-PS3000-01 pity you might consider never to use telnet based on the high security risks.
In order to prove that a message was really sent by the alleged sender the concept of Digital Signatures was invented.
As the name says a message is digitally signed by the sender.
By using 5 signature you can check the authenticity of a message.
Using this will reduce the risk for Trojan horses a message that claims to be a 5 to a certain problem but actually contains a virus or does something bad with data on your computer.
Also information or data can be verified as coming from a legitimate source and thus be regarded as real.
A digital signature is made through a combination of the secret key and the text.
читать полностью the senders public key the message can be verified.
Not only will be checked if the correct sender is involved, also the content will be checked.
So you know that the message comes from the sender and has not been changed during the transportation process.
A weak point of the Public key algorithms is the spreading of the public keys.
A user could bring a public key with false user ID in circulation.
If with this particular key messages are made, the intruder 5 decode and read the messages.
If the intruder passes it on then still with a genuine public key coded to the actual recipient, this attack is not noticeable.
The PGP solution and because of that automatically the GnuPG solution exists in signing 5 />A public key can be signed by other people.
This signature acknowledges that the key used by the UID User Identification actually belongs to the person it claims to be.
It is then up to the user of GnuPG how far the trust in the signature goes.
You can consider a key as trustworthy when you trust the sender of the key and you know for sure that the key really belongs to that person.
Only when you can trust the key of the signer, you can trust the signature.
To be absolutely positive that 5 key is correct 5 have to compare the finger print over reliable channels before giving absolute trust.
If you have data that you would like to remain confidential, there is more to it than just determining which encoding algorithm to use.
You should be thinking about your system security in general.
Basically we consider PGP to be secure and as I write this documents no incidents of PGP being cracked are known to me.
But that doesn't mean that all encoding must be safe then for instance the NSA wouldn't notify me if they cracked PGP somehow, neither would other people who crack for real malicious grounds.
But even if the PGP is fully 'unhackable', other means can be used to attack the security.
Early February 1999 a Trojan Horse had been found that searched for secret PGP keys on the hard disk and FTP-ed them away.
If the password has been chosen badly the secret key can easily be cracked.
Another technical possibility although more difficult is a Trojan Horse that broadcasts keyboard entries.
Also possible but very difficult is to pass the content of a screen along.
Then no cracking of scrambled messages needs to be done.
For all these risks there need to be a good, well-thought security plan that is actually deployed.
It is not a 5 to create paranoia among people, but to point out that a lot needs to be done to be more secure.
The most important thing is to realize that encryption is just one step to security and is not a total solution.
Trojan horses as they appeared in the Melissa virus in March 1999 proved that many 5 are not prepared for that.