Symmetric Key Exchange with Full Forward Security and Robust Synchronization

Key exchange protocols play a vital role in symmetric key cryptography. The transfer of private key through the secured medium is a challenging task because every day the intruders are evolved and the attacks are increasing constantly. The existing key exchange protocols such as Diffie-Hellman, Elgamal, and MQV, etc. are the old methods and many attacks happened on those protocols. That challenges demanding new protocol or methodology of transferring secret key between the parties. The paper proposes a new, secured, less computational overhead key exchange mechanism using short message service available in the cellular networks. GSM-SMS is a highly established secured channel and the research uses this facility to transfer the key between senders to a receiver of the symmetric key cryptosystem. The private key no need to reveal to third parties or even the receiver because the sender can directly communicate to the decryption system through the mobile SMS. After the decryption process, the secret key will be destroyed immediately. There is no possible attack during the key transfer and loss and error of the communication are very less.

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Picpass Algorithm for Solution of Key Exchange Problem in Symmetric and Asymmetric Key Cryptography

International Journal of Scientific Research in Computer Science Engineering and Information Technology ◽

10.32628/cseit217664 ◽

2021 ◽

pp. 305-308

Author(s):

Anchal Goyal ◽

Deepinder Kaur

Keyword(s):

Public Key Cryptography ◽

Key Exchange ◽

Secret Key ◽

Dictionary Attack ◽

Plain Text ◽

Cipher Text ◽

Compact Size ◽

Private And Public ◽

Symmetric Key ◽

Dictionary Attacks

In this dissertation a PicPass algorithm is proposed for the solution of Key Exchange problem using Symmetric and Asymmetric key cryptography. Diffie and Hellman proposed an algorithm for key exchange. But this algorithm suffers from Man-in middle attack. So to overcome this problem Seo proposed another algorithm that uses text password for the agreement between two parties. But again the password suffers from offline dictionary attack. In this, a PicPass Protocol i.e. picture is used as a password to make an agreement between two parties. The protocol contains two function i.e. picture function as well as distortion function is used to make picture in a compact size and then it is sent to receiver. Firstly the sender encrypts the Plain Text using Secret Picture and creates the Cipher Text using Symmetric key cryptography.Then the Secret Picture will be encrypted by covered picture resulting into Encrypted Picture.Now the Cipher Text and Encrypted Picture will be placed into digital envolpe and then the envelope will be send to the receiver. The receiver will receive the digital envelope, open it and then decrypt the Encrypted Picture using his Key Picture. This will result the receiver to get the Secret Picture. Now the receiver will open the Cipher Text using the Secret Picture and get the Plain Text. In between if any person wants to predict the Encrypted Picture then he cannot guess as the picture will only be decrypted using the Secret Key which will be only with the receiver. So in this dissertation, a picture is used as a password to authenticate key exchange is that gives practical solution against offline dictionary attacks only by using both private and public key cryptography.

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