Chosen-plaintext attack on lensless double-random phase encoding in the Fresnel domain

Area of Science:

• Optics
• Cryptography
• Information Security

Background:

• Optical encryption techniques are crucial for secure data transmission.
• Lensless double-random phase encoding (L-DRPE) is a proposed method for optical security.
• The security of L-DRPE against sophisticated attacks needs thorough investigation.

Purpose of the Study:

• To demonstrate a chosen-plaintext attack against the lensless double-random phase encoding (L-DRPE) scheme.
• To analyze the security vulnerabilities of L-DRPE in the Fresnel domain.
• To identify the root cause of security weaknesses in the L-DRPE encryption process.

Main Methods:

• A novel chosen-plaintext attack strategy was developed and applied to the L-DRPE system.
• Impulse functions were utilized as chosen plaintexts to probe the encryption keys.
• The L-DRPE scheme was subjected to cryptoanalysis to understand its security limitations.

Main Results:

• The proposed attack successfully extracts two encryption keys from the L-DRPE system.
• The L-DRPE scheme is confirmed to be vulnerable to chosen-plaintext attacks.
• The decryption process in the demonstrated attack is lossless.
• Numerical simulations validated the theoretical findings of the attack.

Conclusions:

• The L-DRPE optical encryption scheme exhibits significant security vulnerabilities.
• The linearity of the L-DRPE encryption and decryption mechanisms is the primary source of its insecurity.
• Further research is needed to develop more robust lensless optical encryption methods.