Working with Signature-Only and Encryption-Only Modes Sample Clauses

Working with Signature-Only and Encryption-Only Modes. In practice, some messages may need to be signed only, some encrypted only, while others encrypted partially. For the two digital signcryption schemes SCS1 and SCS2, when a message is sent in clear, they degenerate to signature schemes with direct veri ability by the recipient only. As will be argued in Section 9.2, limiting direct veri ability to the recipient only still preserves non-repudiation, and may represent an advantage for some applications where the mere fact that a message is originated from Xxxxx needs to be kept secret. Furthermore, if Xxxxx uses g instead of Xxx's public key yb in the calculation of k, the schemes becomes corresponding shortened ElGamal based signature schemes with universal veri ability. In an application where a message requires con dentiality only, one may either switch to a public key encryption scheme such as the ElGamal scheme, or stick to a signcryption scheme. The latter is more e cient than the former, even though authenticity may not be a concern in such an application.
Sample 1
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