| CPC H04L 9/008 (2013.01) [G06F 21/602 (2013.01); H04L 9/0869 (2013.01)] | 20 Claims |
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10. An operating method of an encryption device, the method comprising:
generating an encryption parameter including a number of initial valid bits based on an operation scenario of a homomorphic operation;
generating a cipher text by encrypting a plain text received from the outside, based on the encryption parameter;
generating a final cipher text by performing a plurality of homomorphic operations on initial cipher text according to the operation scenario; and
outputting a decrypted plain text by decrypting the final cipher text,
wherein the initial valid bits are valid bits included in the cipher text before the plurality of homomorphic operations are performed, and
wherein the operation scenario includes the plurality of homomorphic operations to be performed on the cipher text.
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