Improving Standard Methods of Message Cryptography

Abstract

Protecting secret messages from being hacked is a vital issue. In this paper research some standard symmetric and asymmetric methods of data cryptography will be studied and a comparative analysis of these methods will be provided. A simple, highly secure and efficient method of secret messages cryptography will be introduced; the method will use a character private key with variable length. Increasing the PK length will increase the key space making the method capable to resist any attack, the produced decrypted message will be very sensitive to the PK, any changes in the PK during the decryption phase will be considered as a hacking attempt by producing a damaged decrypted message. The proposed method will be implemented using various messages; the obtained results will be analyzed to prove the quality, security and efficiency achievements provided by the proposed method.

Mixed Chaotic Keys to Protect Digital Color Image

“…The proposed method as shown in figure 4 extracts the color channels [42][43][44][45][46][47][48][49][50] and each color 2D matrix is encrypted-decrypted using its own generated secret key. Two kinds of chaotic maps are used to generate the secret keys [57]. The first and the third keys are generated by running two chaotic logistic map models (CLMM) and the second key is generated by running chaotic tent map model (CTMM), the parameters of these chaotic models are included in the PK [50][51][52][53][54][55][56][57].…”

“…Two kinds of chaotic maps are used to generate the secret keys [57]. The first and the third keys are generated by running two chaotic logistic map models (CLMM) and the second key is generated by running chaotic tent map model (CTMM), the parameters of these chaotic models are included in the PK [50][51][52][53][54][55][56][57]. The PK will have a complicated structure shown in table 3, this structure will provide a huge key space making the method secure and making the hacking process impossible [45][46][47][48][49].…”

“…Figure 1: DCI color channels DCI are used in many computer applications and they are transmitted via communication environments [37][38][39][40][41][42], thus they require high protection for many reasons such as: DCI may be secret, DCI may be private, DCI may hold secret information and used as a stego image, and the communication environment may be not safe [43][44][45][46][47][48][49][50][51][52]. DCI cryptography is one of the easiest techniques used to protect images [10][11][12][13][14][15]. Cryptography means encrypting the image before sending by converting it to a corrupted damaged image see figure 2, and decrypting the encrypted image after receiving by converting the damaged image to a clear image, which is identical to the source image [16][17][18][19][20].…”

“…Crypto system as shown in figure 3 contains encryption function (EF) and decryption function (DF), EF uses the private key (PK) to treat the source image to produce the encrypted image, while the DF uses the same PK to treat the encrypted image to produce the decrypted image [21][22][23][24]. A good crypto system must satisfy the quality requirements by producing an encrypted image with low quality and by producing a decrypted image with excellent quality, the quality parameters measured between the source DCI and between each of the encrypted and decrypted images must satisfy the quality requirements listed in table 1 [52][53][54][55][56][57]: Many methods were proposed for data cryptography, a lot of these methods were based on the standard methods of data cryptography such as DES, 3DES, AES and blowfish (BF) methods. These methods share some features such as [24][25][26][27][28][29][30][31][32][33][34]: -They provide good quality requirements.…”

Encryption of Information on Brain Tumor Images Using Vigenere Cipher Algorithm and Least Significant Bits

“…Abu-Faraj, et. al [4], argued that protecting confidential data can be done using cryptography, which will be encrypted when sending data and decrypted when receiving data. In the process of data encryption or cryptography, the algorithm or method that can be used is the vigenere cipher.…”