The difference is that I would consider both the public encryption key and private decryption key of an asymmetric algorithm a "ciphering key". In my understanding the terms "ciphering key" and "encryption key" are mostly synonymous. It might be that the Hebrew term is wrong and the meaning is "encryption key". The idea is that these operations are made irreversible without the secret or private key. Modern ciphers do commonly use substitution and transposition (which could be described as "resorting I suppose), but those operation depend on the key used. No, in the realm of cryptography the cipher is not just resorting of characters. Essentially, the client is assuming that it knows the server’s preferred key exchange method (which, due to the simplified list of cipher suites, it probably does). Digital computers do require a representation using bits though.Ĭipher, as far as I know, is a matter of resorting characters to get a meaningful message, so what "key" is needed to do so? Often times, a cipher uses the Morse Code, which uses light or sound to encode messages. The form of the key depends entirely on the algorithm used. A cipher key is information that can be used to decipher a message. For classical ciphers such as the Caesar cipher or for asymmetric cryptography the key commonly consists of one or more numerical values. For symmetric systems it is commonly binary. So the ciphering key is an input to the cipher algorithm. Only the parties that know the secret or private key should be able to gain knowledge about the message (not considering the message length) if this is the case then the cipher is considered secure. In asymmetric algorithms the public key is used to encrypt (enciphering) and the private key for decryption (deciphering). This key is pre-established: a secret key known at both sides for symmetric ciphers such as AES or part of a public-private key pair for asymmetric algorithms such as RSA. The way to keep messages secret is to transform them using the cipher algorithm using a (ciphering) key. Cryptography itself means "secret writing", although modern cryptography has expanded to cover a lot more than just ciphers. If you are using 13 as the key, the result is.
However, in the realm of cryptography, a cipher is an algorithm used to obtain confidentiality. The following tool allows you to encrypt a text with a simple offset algorithm - also known as Caesar cipher. Now it seems that the origin of the term cipher has to do with the numerical conversion of a message. A cipher is defined for cryptography as "A cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext."
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