Score:-1

Encryption of message concatenated with encrypted message

in flag

Is there a possibility to encrypt a message that is a concatenation of an encrypted message and another message ( encrypt_message + message )?

poncho avatar
my flag
You can compute the concatenation of two strings (one of which is an encrypted message), and then encrypt that concatenation. That is obvious; what did you mean to ask?
kelalaka avatar
in flag
Do you fear double encryption will cancel?
Manish Adhikari avatar
us flag
Of course you can add as many layers of encryption as you like. It can be insecure if done poorly, like encrypting again with same key and nonce using stream ciphers (incl block ciphers in stream modes like CTR/GCM/CCM or OFB) which cancels out encryption altogether. But generally, it is safe
omrani omaima avatar
in flag
@poncho yes , this what i mean
Score:1
sk flag

Of course it is possible. One can encrypt any message, no matter how it is formed.

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