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Encryption: encrypted=(plain^e)%n. Note: If plain>=n, you must split plain into two or more smaller values and encrypt them separately. Decryption: plain=(encrypted^d)%n. Asymmetric encryption is typically less efficient than Symmetric encryption. Sometimes Asymmetric encryption is used only for key exchange.
Symmetric encryption is used when a * small group of users need access to the information. Furthermore symmetric encryption is nice because it is easier to understand (less likely to mess it up) and the algorithms tend to be faster. Asymmetric encryption is used when a large group of users need access to the information.
Asymmetric encryption requires something magical. If you want to go with the knot metaphor, then it is a kind of knot where even knowing how things were tied up does not reveal how to untie them. In cryptographic terms, it must not be feasible to recover the private key (which is the power to decrypt data), even if the public key (the power to ...
2. PGP is a file format. The file format uses Asymmetric encryption to encrypt a symmetric encryption key. the symmetric encryption key encrypts the data. The file format also supports using a passphrase/password to encrypt a symmetric key, and the symmetric key encrypts the data. The file format basically specifies the type of encryption ...
8. In fact, the assertion that asymmetric cryptography is slower than symmetric cryptography does not make a lot of sense. They do not do the same thing. What asymmetric cryptography does, symmetric cryptography cannot do; less intuitively, this also works the other way round: what symmetric cryptography does, asymmetric cryptography cannot do.
3DES is symmetric encryption, always. This means that the same key is used for encryption and decryption and that thus both sender and recipient need to know this key. But it might be used together with asymmetric encryption. Asymmetric encryption is often used to share the common key then used for the symmetric encryption in a secure way.
It is a method for two parties to securely exchange keys across an untrusted medium (you could argue that this is asymmetric encryption of the key, and while technically correct this confuses the crap out of crypto-newbies). This key is then used by symmetric encryption algorithms such as AES and 3DES –
asymmetric encryption: RSA with a too short key (i.e. 768 bits or less), RSA with improper padding (e.g. ISO 9796-1), Diffie-Hellman modulo a too small prime number (768 bits or less)(Diffie-Hellman is not really an asymmetric encryption algorithm, but a key agreement algorithm -- but most usages of asymmetric encryption are really disguised ...
Trying to generalize it like you have done gets messy really fast because there are many asymmetric (or "public key") cryptographic algorithms (paraphrased from wikipedia): Examples of well-regarded asymmetric key encryption and key exchange techniques for varied purposes include: Diffie–Hellman key exchange protocol; ElGamal encryption algorithm
Principle of asymmetric algorithm in plain english (6 answers) Closed 2 years ago . I understand that to "encrypt" something means to "code" it, to make it understandable for two parties, giver and receiver and generally only for them, but I don't know what it means when this is being done symmetrically or asymmetrically.