# encryption

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## Encryption

The coding of sensitive information for transfer online or otherwise electronically. One may encrypt data to prevent anyone other than the intended recipient from accessing it. For example, if one buys a product online and enters credit card information into an electronic form, that information is usually encrypted so hackers and potential identity thieves cannot use it for illicit purposes.

## encryption

The manipulation of data to prevent accurate interpretation by all but those for whom the data is intended. Financial institutions use encryption to increase the security of data transmitted via the Internet.
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* Confidentiality: any independent third party other than the entities involved cannot acquire any valuable advice related to the plaintext of a ciphertext;
Evaluate and Decrypt: These are the same as the ones in the [24], except that the ciphertext is reduced by modulo 0 after addition and multiplication.
1) What is the number of packets per ciphertext?: This is evaluated as follows.
seeming ciphertext that the government has in hand is really a valid
The ciphertext calculation algorithm Evaluates (pk, f,[c.sub.1],[c.sub.2], [c.sub.n]): the operation of the ciphertext should satisfy:
Algorithm 3 takes a ciphertext [CT.sub.F], a file tag value [Tag.sub.F], a master key [MK.sub.Srv] and the highest challenge [mathematical expression not reproducible] as an input and outputs an expected response set [ResArr.sub.Srv].
The decryption algorithm takes public key PK, ciphertext C, and user secret key S[K.sub.S] as the input.
Then, the challenger responds the challenge ciphertext CT = Enc(pk, [m.sub.b]) under a random bit b.
The protocol enables Alice, who is in possession of a ciphertext c, to finish the protocol with the correct decryption of c.
It needs 9 plaintext and ciphertext pairs to conduct computation 9 times in Step 3, and the equation system will have a finite set of solutions.
Third, there are pixel substitution and ciphertext diffusion.
proposed a KP-ABE scheme [8] which can achieve the revocation of users; however, this scheme is limited to be used if and only if the number of attributes associated with ciphertext is just half of the whole attributes in the system; therefore, the limit is too high which impedes its actual application.

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