a message written in a secret code
Used in a Sentence
cipher
How to use cipher in a sentence. Example sentences and definitions for cipher.
Editorial note
Many more "bad things" happen in this space than in the block cipher space.
Examples13
Definitions7
Parts of speech2
Quick take
a message written in a secret code
Meaning at a glance
The clearest senses and uses of cipher gathered in one view.
a mathematical element that when added to another number yields the same number
a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it"
Definitions
Core meanings and parts of speech for cipher.
noun
a message written in a secret code
See also: cypher
noun
a mathematical element that when added to another number yields the same number
noun
a quantity of no importance; "it looked like nothing I had ever seen before"; "reduced to nil all the work we had done"; "we racked up a pathetic goose egg"; "it was all for naught"; "I didn't hear zilch about it"
noun
a person of no influence
noun
a secret method of writing
See also: cypher, cryptograph
verb
convert ordinary language into code; "We should encode the message for security reasons"
verb
make a mathematical calculation or computation
Example sentences
Many more "bad things" happen in this space than in the block cipher space.
IGE is a block cipher mode that was designed in 1977 and forgotten about in 1978.
What happens is that subkeys can be up to 72 bytes long but will not affect all bits of ciphertext.
* This ensures that every key bit affects every cipher * bit.
That's because RC4 is the only widely-supported stream cipher in TLS.
This sort of reasoning is typical of people who 'crack' ciphers by coming up with all sorts of complex explanations.
* Warning: For normal blowfish encryption only 56 bytes * of the key affect all cipherbits.
Block ciphers are extremely well understood, have been studied to death for years, and are modeled on extremely well understood constructs.
But attackers don't need access to plaintext to attack repeated-key XOR, which is what a set of ciphertexts encrypted under the same stream cipher keystream works out to be.
What you need is to know the theory -- CTR mode provides privacy assuming a strong block cipher is used and nonces are unique -- and then verify that the preconditions are satisfied.
And then it was mathematically proven that there's a proper order to the two operations: cryptosystems should encrypt, then they should authenticate the ciphertext.
MD-style hashes chunk their inputs into blocks and tag the last block with a length; they then run in a manner similar to a block cipher, where each block is combined with the previous block after the hash function core is applied.
At 18 I knew: C, C++, 80x86 assembler, shell script, Perl, how to compose and validate an IP packet, the OSI networking model, basic protocol design, peer to peer protocol design concepts, and quite a bit about cryptography including how to properly construct an authenticated cryptographic envelope and the importance of choosing the right block cipher mode of operation.
Frequently asked questions
Short answers drawn from the clearest meanings and examples for this word.
How do you use cipher in a sentence?
Many more "bad things" happen in this space than in the block cipher space.
What does cipher mean?
a message written in a secret code
What part of speech is cipher?
cipher is commonly used as noun, verb.