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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.

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The essential ingredients of a symmetric cipher include a secret key, an encryption algorithm, and a decryption algorithm. The secret key is shared between the sender and receiver and is used to encrypt and decrypt the data. The encryption algorithm transforms plaintext into ciphertext using the key, while the decryption algorithm reverses this process, converting ciphertext back into plaintext using the same key. Security relies on the secrecy of the key, as anyone with access to it can decrypt the data.

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Symmetric encryption requires that both parties (sender and receiver) know and have the exact same encryption key. This key is used both for encrypting and decrypting the data. Using the same encryption algorithm means that only those individuals that know or have the same key will be able to read any messages encrypted by the symmetric key.

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following steps are involved in symmetric cryptography

1- sender creates a ciphertext message by encrypting the plain text message with a symmetric encryption algorithm and a shared key.

2- the sender sends the ciphertext message to the recipient.

3- the recipient decrypts the ciphertext message into plain text with a shared key.

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ONE

Answer Explanation: Only one key would be required for everyone to be able to encrypt and decrypt the message. Symmetric cryptography uses the same "shared secret" key for encrypting and decrypting a message. A message encrypted using a symmetric encryption algorithm can be decrypted by anyone with the key. For this reason it is very important to ensure that the key is protected from unauthorized use. One of the primary security issues surrounding the use of symmetric cryptography is the method used to transport the key to users who need it, as most forms of communication are susceptible to eavesdropping.

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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

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The diffie hellman key exchange uses prime numbers to generate an asymmetric key pair which is used to create a secure channel over which a privet symmetric key can be sent.

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In symmetric key techniques there is a single key and that key is kept secret. Symmetric key is a like a sub part of classical encryption.

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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.

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Data Encryption Standard is a symmetric-key algorithm for the encryption of electronic data. It is considered a block cipher because it uses an algorithm that takes a plaintext bits and transforms it through into another ciphertext bitstring of the same length

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There are 2 types of cryptography such as:

1- Symmetric-key or Secret key Cryptography 2- Asymmetric-key or Public key Cryptography

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There are 2 types of cryptography such as:

1- Symmetric-key or Secret key Cryptography 2- Asymmetric-key or Public key Cryptography

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A symmetric cipher is an algorithm that uses the same secret (private key) for both encryption and decryption. An asymmetric cipher is an algorithm that uses two different secrets, a public key for encryption, and a private key for decryption.

In English, basically the job of cryptography algorithms are to make text or files jumbled so it can't be read except by the desired recipients. Different algorithms use different techniques for doing this such as switching the order of letters or substituting them with a different letter, and the secret provides the exact instructions on how to do that.

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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).

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Public key algorithms (PKA) use two keys: one for encryption and the other for decryption. A "secret" or "symmetric" algorithm uses the same key to do both. In PKA, the owner of a secret key publishes the matching private key. Anything sent using the secret key can only be read using the public key assigned to that owner and anything sent to the owner using the public key can only be read using the secret key. Historically, PKA is very complicated and time-consuming, so most systems would use it only for highly secure transactions, such as sending a new (and much faster) symmetric key, or for user authentication (often done at human speeds).

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Symmetric key encryption can be hacked through various methods, such as brute force attacks, where an attacker tries all possible key combinations until the correct one is found. If the key is weak or short, this process can be relatively quick. Additionally, if an attacker gains access to the key itself through methods like social engineering or poor key management practices, they can easily decrypt the data. Lastly, vulnerabilities in the encryption algorithm or implementation can also be exploited to break the encryption.

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A shared secret key

and other words;

Both the sender and receiver share the same key

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1. RSA comes under Asymmetric and DES comes under Symmetric

2. RSA is more secure than DES.

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In symmetric key encryption there is one key that is shared with the person you want to share with your data. The largest disadvantage is that you have to make sure that the key remain secret.

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Symmetric Session-Key Protocol

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A shared secret key.

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RSA (Rivest, Shamir, and Adelman) is the best public key algorithm.

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DES stands for Data Encryption Standard. It is a symmetric-key algorithm used for the encryption of electronic data. DES was widely used for securing sensitive but unclassified material, but it has largely been replaced by more secure algorithms due to vulnerabilities associated with its key length.

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Symmetric cryptography uses the same secret (private) key to encrypt and decrypt its data whereas asymmetric uses both a public and private key. Symmetric requires that the secret key be known by the party encrypting the data and the party decrypting the data. Asymmetric allows for distribution of your public key to anyone with which they can encrypt the data they want to send securely and then it can only be decoded by the person having the private key. This eliminates the need of having to give someone the secret key (as with symmetric encryption) and risk having it compromised.

The issue with asymmetric is that it is about 1000 times slower than symmetric encryption which makes it impractical when trying to encrypt large amounts of data. Also to get the same security strength as symmetric, asymmetric must use strong a stronger key than symmetric.

If you do a quick search on the differences between symmetric and asymmetric you can find many more explanations. This just a quick overview.

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Boorapa Chodchoey has written:

'Optimal deterministic algorithm for the simple symmetric hypotheses testing problem'

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A Saville algorithm is a classified NSA (National Security Agency) Type 1 encryption algorithm. Due to the nature of this algorithm little is known publicly, however some military documentation and personal have stated that it has a 128 bit key.

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A key is used to encipher something. The same key can be used to decipher it.

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From another user: Symmetric cryptography uses the same secret (private) key to encrypt and decrypt its data whereas asymmetric uses both a public and private key. Symmetric requires that the secret key be known by the party encrypting the data and the party decrypting the data. Asymmetric allows for distribution of your public key to anyone with which they can encrypt the data they want to send securely and then it can only be decoded by the person having the private key. This eliminates the need of having to give someone the secret key (as with symmetric encryption) and risk having it compromised.

The issue with asymmetric is that it is about 1000 times slower than symmetric encryption which makes it impractical when trying to encrypt large amounts of data. Also to get the same security strength as symmetric, asymmetric must use strong a stronger key than symmetric.

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A symmetric cipher means that the key is the same for scrambling and unscrambling the data. Symmetric = same

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Symmetric cryptography only requires one key for both encryption and decryption and therefore in some cases are a issue.

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A shared secret key

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"Private key" in the context of cryptography refers to the the key generated for an asymmetric encryption algorithm which is retained by the owner while the companion "public key" is published for others to utilize for secure communications or authentication. The "private key" is not shared with anyone.

A "secret key" in the context of cryptography refers to the single key generated for use in a symmetric encryption algorithm which is only shared between those between whom secure communication is desired. It is kept secret from all others. The secret key must be transmitted to or shared with all parties by a method outside the communications link it is intended to secure.

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There are 4 symmetric prime's from 1 - 200. They are:

(13,31)

(17,71)

(37,73)

(79,97)

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Symmetric-key algorithms are a class of algorithms for cryptography that use trivially related, often identical, cryptographic keys for both decryption and encryption.

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Symmetric key cryptography has several disadvantages, primarily the challenge of secure key distribution, as both parties must share the same secret key without interception. Additionally, if the key is compromised, all data encrypted with that key becomes vulnerable. Moreover, managing multiple keys for different users can become complex, as the number of keys increases exponentially with the number of participants. Lastly, symmetric encryption does not provide non-repudiation, making it difficult to prove the origin of a message.

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Depending on how you write them:

0, 1, and 8 are themselves symmetric

2 and 5 are mirror images

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PGP (Pretty Good Privacy) encryption works by using a combination of symmetric and asymmetric encryption techniques. When a user wants to send a secure message, PGP generates a random symmetric key to encrypt the message. This symmetric key is then encrypted using the recipient's public key before sending the message. The recipient can use their private key to decrypt the symmetric key, which can then be used to decrypt the original message.

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The definition of an encryption key is a way to transform information using an algorithm. By doing this, not anyone can read the transformed scripts, but only those who know the algorithm can solve the scripts.

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