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Can you do encryption without a shared secret or a previous exchange of public key OR how to trust the 1st exchange?
Yes, encryption can be performed without a shared secret or a previous exchange of public keys through the use of asymmetric encryption or public key infrastructure (PKI). In this system, each party has a pair of keys: a public key, which can be shared openly, and a private key, which is kept secret. To trust the first exchange, digital certificates issued by a trusted certificate authority (CA) can be used to verify the authenticity of public keys, ensuring that the keys belong to the claimed entities. This mechanism helps establish trust without prior key exchanges.
What are some characteristics of asymmetric cryptography?
Asymmetric cryptography, also known as public-key cryptography, involves a pair of keys: a public key, which can be shared openly, and a private key, which is kept secret. This method allows for secure communication and data exchange, as the public key encrypts messages that can only be decrypted by the corresponding private key. Key characteristics include enhanced security, as the private key is never shared, and the ability to authenticate identities through digital signatures. This system is widely used in secure communications, such as SSL/TLS for internet security.
Two kinds of keys are used in public key encryption?
In public key encryption, two kinds of keys are utilized: the public key and the private key. The public key is shared openly and used to encrypt messages, while the private key is kept secret and used to decrypt those messages. This system ensures that only the intended recipient, who possesses the corresponding private key, can access the encrypted information. This method enhances security by enabling secure communication without the need for sharing a secret key beforehand.
In asymmetric encryption the keys are mathematically?
In asymmetric encryption, the keys are mathematically related but serve different purposes: one is a public key, which can be shared openly, and the other is a private key, which is kept secret. The encryption process uses the public key to encrypt data, while the decryption process requires the corresponding private key. This relationship ensures that only the holder of the private key can decrypt messages encrypted with the public key, providing a secure means of communication. The mathematical foundation typically involves complex algorithms based on number theory, such as RSA or elliptic curve cryptography.
True or false asymmetric encryption the keys are mathematically related to one another?
True. In asymmetric encryption, there are two keys: a public key and a private key, which are mathematically related. This relationship allows data encrypted with the public key to be decrypted only with the corresponding private key, ensuring secure communication. However, while they are related, it is computationally infeasible to derive one key from the other.
Can you do encryption without a shared secret or a previous exchange of public key OR how to trust the 1st exchange?
Yes, encryption can be performed without a shared secret or a previous exchange of public keys through the use of asymmetric encryption or public key infrastructure (PKI). In this system, each party has a pair of keys: a public key, which can be shared openly, and a private key, which is kept secret. To trust the first exchange, digital certificates issued by a trusted certificate authority (CA) can be used to verify the authenticity of public keys, ensuring that the keys belong to the claimed entities. This mechanism helps establish trust without prior key exchanges.
How many encryption keys are needed to fully implement an asymmetric algorithm for 55 participants?
In an asymmetric encryption algorithm, each participant requires a pair of keys: a public key and a private key. Therefore, for 55 participants, you would need 55 public keys and 55 private keys, resulting in a total of 110 keys. However, since each participant has their own pair, the total number of unique key pairs remains 55.
What are the difference between DES and RSA algorithm?
DES is a symmetric cryptographic algorithm, while RSA is an asymmetric (or public key) cryptographic algorithm. Encryption and decryption is done with a single key in DES, while you use separate keys (public and private keys) in RSA. DES uses 56-bit keys for encryption while RSA uses 2600-bits of KEY
How many keys are required for two people to communication via a cipher?
That depends on whether you use a symmetric (shared key) or asymmetric (public/private key pair) algorithm. If you use a symmetric key, it means both people have the same key which has been pre-shared via some secure means. In that case, only one key is required; both parties in the communication use the same key to encrypt and decrypt all messages. If you use an asymmetric key algorithm, it takes at least 4 keys total: when sending a message each user will encrypt their message with the public key of the recipient (that accounts for two of the keys). Each recipient must then use their private key to decrypt the messages they receive (which accounts for the other two required keys).
What key is often used to securely distribute symmetric algorithm keys?
The key commonly used to securely distribute symmetric algorithm keys is the asymmetric encryption key, often derived from public-key cryptography. In this method, a sender uses the recipient's public key to encrypt the symmetric key, which can then be safely transmitted over insecure channels. Only the recipient, possessing the corresponding private key, can decrypt the message to retrieve the symmetric key. This approach ensures confidentiality and secure key exchange.
What is the diffie-hellman cipher?
Diffie-Hellman is not as much a cipher as a means of securing exchanging keys. You would use it to securely notify someone else of a symmetric shared key that you both would use for encrypting data. Think of it as more a key exchange method utilizing public and private keys than an actual cipher methodology.
What is the difference between AES and RSA?
AES is a symmetric cryptographic algorithm, while RSA is an asymmetric (or public key) cryptographic algorithm. Encryption and decryption is done with a single key in AES, while you use separate keys (public and private keys) in RSA. The strength of a 128-bit AES key is roughly equivalent to 2600-bits RSA key.
Which encryption protocol uses pre-shared keys to authenticate users pre- shared keys to authenticate users?
WPA
What is open key?
An open key, often referred to in the context of cryptography, is a public key used in asymmetric encryption systems. It allows for the secure exchange of information, enabling anyone to encrypt data that can only be decrypted by the corresponding private key holder. Open keys are fundamental in ensuring secure communications over the internet, such as in SSL/TLS protocols. They are typically shared publicly, allowing users to verify signatures or encrypt messages without needing to share private keys.
What are some characteristics of asymmetric cryptography?
Asymmetric cryptography, also known as public-key cryptography, involves a pair of keys: a public key, which can be shared openly, and a private key, which is kept secret. This method allows for secure communication and data exchange, as the public key encrypts messages that can only be decrypted by the corresponding private key. Key characteristics include enhanced security, as the private key is never shared, and the ability to authenticate identities through digital signatures. This system is widely used in secure communications, such as SSL/TLS for internet security.
What is the difference between using open authentication and pre-shared keys?
Open authentication requires a password. Pre-shared keys do not require a password.
Which key is often used to securely distribute symmetric algorithm keys?
Session key
