Evaluate (C,[c.sub.1](m),[c.sub.2](m),...,cn ( m)): Suppose C is a Boolean circuit and ([c.sub.1](m),[c.sub.2](m),...,cn ( m)) be a tuple of ciphertext
. Then, ciphertexts
can be evaluated by C as long as the noise growth in the ciphertexts
does not exceed the threshold.
It is known that the multiplication operation causes a large noise to ciphertexts
compared to addition operation, a user cannot use a multiplication operation if the plaintext-space is not large enough.
case--namely, the ciphertext
, the password, and the plaintext.
e) Test algorithm: This is a deterministic algorithm which takes as input the IDERMKS ciphertext
I, trapdoor [T.sub.w] and system parameters.
': sign for denoting faulty ciphertext
or intermediate values.
achieves an efficient access control mechanism using Constant-size Ciphertext
Policy Comparative Attribute-Based Encryption (CCP-CABE) with the support of negative attributes and wildcards.
Therefore, it is natural to require that the ciphertexts
be protected by a separate secure channel between Alice and the encryptor.
CP-ABE scheme attaches access policy in ciphertext
instead of attributes of accessors.
But the power usage data m; cannot be recovered from the ciphertext
[mathematical expression not reproducible], since the reader cannot get the ESP's secret key (p, q).
The [c.sub.j] are called the ciphertext
units and we do not perform cancellations between [c.sub.i] and [c.sub.i+1] and the end of each [c.sub.i] is marked, 1 [less than or equal to] i <[less than or equal to] z -1, for example with the symbol "[??]".
This paper takes the former approach, where we do not use a known background model, but assume a known ciphertext
Attribute-Based Encryption: In some scenarios, the recipient of the ciphertext
is not yet known at the time of the encryption or there are more than one recipient who should be able to decrypt the ciphertext