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Results tagged with encryption
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user 75740
Encryption is the process of transforming plaintext using a cipher into ciphertext to make it unreadable to anyone except those possessing the key. Decryption is the process of transforming that ciphertext back into plaintext, using the key.
2
votes
Hide Randomness in Ciphertext
You can compute an $f(g(m))$ in which $g(m)$ is your encryption method and $f$ is a meaningful mapping function. As an example of $f$ I can mention a dictionary codebook mapping. …
- 283
1
vote
1
answer
195
views
Security of the encryptions, using a PRG for the keyGen
When we use the output of a PRG as the key for a symmetric key encryption, doesn't it mean that the adversary still only needs to check exhaustively the space of the seed? … The encryption method that made me sceptical is an encryption scheme which works only by different rounds of permutations sequentially (i.e., it divides the message into blocks, permutes the blocks, and …
- 283
1
vote
Accepted
Security of keys that are as long as the data
Reasoning for longer messages is the same as the encryption method works bit-by-bit …
- 283