Dear Researcher,
I will like to know whether a ciphered image from an encryption process can undergo another round of encryption. i.e. encrypting the ciphered image again?
Thanks,
Edwin
Salah Albermany, many thanks for your answer. Can you kindly expatiate on hybrid encryption? Are there reported works on such research?
Usually, the nesting of an asymmetric and a symmetrical cipher is called hybrid encryption.
There are so many different techniques that can be used to protect image from unauthorized user/attackers.
1. Advanced Encryption Standard (AES)
2. Block-Based Transformation
3. Self-Invertible Key Matrix of Hill Cipher Algorithm
4. Combination of Permutation Technique Followed by Encryption
5. Hill Cipher Algorithm
6. Digital image encryption algorithm (DES)
7. Hash Function
8. Chaotic Logistic Maps
9. Affine Transform and XOR Operation
10. Permutation
11. Genetic Algorithm
12. Differential Evolution
13. S-box in image encryption
The attach paper is another technique called DLP (Discrete logarithmic Problem) method through which we can protect data.
Similarity Signicription is another method
@Saeed and Gunter, many thanks for your respective insights. My question relates specifically to chaos-based encryption in which we use chaotic dynamics to encrypt images. I wonder how the ciphered image can be XORed. Regards
Dear Jan,
Thank, but how GA , work to encryption , and decryption, it,s for approximation solution.
Thanks, Shihab. However, I am particularly interested in knowing whether the ciphered image may still be subjected to another round of encryption.
Edwin A. Umoh , A Multistage encryption scheme can implement the idea. I presume that the aim is to strengthen your encryption scheme. You should just pay attention if you apply pixel based encryption or block based encryption.
Yes, it is possible to encrypt the image but why encrypt it twice
Luaay Abdulwahid Shihab , The question can also just be: why to encrypt even once? Here we are not talking about the type of encryption specifically. Multiple encryptions schemes do exist. Recently the « rule of 2 » from the NSA has shown that higher security needs that multiple encryption(The first one done at the physical layer and the second one at the software layer).
DR . Philippe Faradja
Thanks for the clarification I agree with you
Thank you Faradja and Shihab, for your answers. The aim is essentially to increase the security layers of the scheme, even though it would appear that the second stage encryption does little to the pixels of the already ciphered image. However, it could increase the complexity of the key space. Some strategies may not be too conventional, yet could add to security of the scheme, and possibly give insight on how such approaches could be improved upon, later.
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