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- Certified E-Mail Delivery with DSA ReceiptsAleksandra Nenadic, Ning Zhang, Qi Shi, Carole A. Goble. ipps 2005: [doi]
- RSA-based Verifiable and Recoverable Encryption of Signatures and its application in certified e-mail deliveryAleksandra Nenadic, Ning Zhang, Qi Shi. jcs, 13(5):757-777, 2005. [doi]
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