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Proposal Hybrid CBC Encryption System to Protect E-mail Messages

Author: Soukaena Hassan Hashem
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2019 Volume: 60 Issue: 1 Pages: 157-170
Publisher: Baghdad University جامعة بغداد


Email is one of the most commonly utilized communication methods. Theconfidentiality, the integrity and the authenticity are always substantial incommunication of the e-mail, mostly in the business utilize. However, these securitygoals can be ensured only when the cryptography is utilized. Cryptography is aprocedure of changing unique data into a configuration with the end goal that it isjust perused by the coveted beneficiary. It is utilized to shield data from otherindividuals for security purposes. Cryptography algorithms can be classified assymmetric and asymmetric methods. Symmetric methods can be classified as streamcipher and block cipher. There are different operation modes provided by the blockcipher, these are Cipher Block Chaining (CBC), Output Feedback (OFB), CipherFeedback (CFB) and Electronic Code Block (ECB). CBC used to complex thecryptographic systems, by using Initialization Vector (IV), Xoring, and encryptionwith specified key over chain of blocks, but CBC is vulnerable to chosen plaintextattack because the IV is static and vulnerable to chosen ciphertext attack because theencryption method with the key are static. This paper introduce a proposed E-mailmessages encryption systems , the proposal based on modified CBC mode operationhybrid with some of techniques exploited in the encryption such as RADG, DNA,RNA and a suggested permutation methods. The proposed modifications applied onthe CBC are generate IV randomly, generate key randomly, and propose encryptionmethod, these modifications proposed to avoid the attacks that CBC is vulnerable to.


cryptography --- CBC --- RADG --- DNA.

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