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A novel crypto technique based ciphertext shifting
یک تغییر متن رمزنگاری مبتنی بر تکنیک رمزنگاری-2019 One of the significant issues in information security areas is a hidden exchange of data. There are several
techniques for this purpose such as cryptography, steganography, etc. Generally, in cryptography, the
secret message content is scrambled. In another hand in steganography, the secret message is embedded
inside the cover medium. In this paper, a new crypto technique-based ciphertext shifting algorithm has
been designed to improve the security for our previous work that combining cryptographic and steganographic.
The improvement in the security of the secret message is done by changing the ciphertext value.
The proposed shifting algorithm is used to rearranges the location of each character of ciphertext based
on key value, in which the final ciphertext length is equivalent to encryption value but it different in
value. The key strength of this method is two side one is trick the attacker from notice any change in
ciphertext which is the same length as the original, so when used the common cryptanalysis will not
get anything due to the original ciphertext has been changed. The second key strength of this method
is that the shifting value is variable and dependent on key length. This method is inspected to be a very
strong technique that can prevent common cryptography attacks such as a dictionary or brute-force
attacks, etc. Keywords: Cryptography | Ciphertext | Shifting algorithm | HMAC | AES |
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