Determine the recommended key sizes and hash digest lengths for the algorithm

Digital Documents

Consider the following scenario. Two law firms used to manually exchange signed contracts. Now they are deciding to “go digital.” Their requirement is that any document sent from one firm (say, firm A) to the other (say, firm B) needs to be legally binding; that is, in case of a dispute, firm B should be able to prove to a court that a document has been sent to them from firm A in its exact form. In other words, if firm A sends a document to firm B, then firm A should not be able to later deny sending the document.

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The firms are looking to adopt a cryptographic solution to satisfy their requirement. They were advised to choose a (nationally or internationally) standardized solution. Due to the nature of the documents, the firms require that the solution they adopt is secure for up to 5 years. The firms are based in the United States and the European Union; hence they were advised to follow NIST 2020 and ECRYPT-CSA 2018 recommendations for security levels and key sizes.


(i). Identify the security property required by the firms and the cryptographic primitive (algorithm) that would provide this property.

(ii). Propose a standardized scheme to be adopted by the firms, citing the specific standard recommending the algorithm.

(iv) .Considering the duration requirement of the firms, recommend a level of security for the firms that satisfies both the NIST 2020 and ECRYPT-CSA 2018 recommendations, and briefly justify your answer. Determine the recommended key sizes and hash digest lengths for the algorithm proposed in part (ii).

(v)Considering the proposed solution, explain what preparations need to be made in terms of generating and sharing cryptographic information between the two firms before the proposed algorithm can be used for exchanging documents.

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