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针对C程序设计语言实验教学考核的需要,阐述了制定实验考核评价指标的基本原则,确立了各项考核评价指标,比较详细地说明了各项指标的观测内容。该指标体系能够帮助教师对C语言的实验教学考核作出整体评价。 相似文献
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在评定C语言程序的分值时,通常需要对学生所写程序的变量定义语句的书写词符号串是否是正确的关键词进行识别和判定.这就需要考虑如何计算两个字符串或一个字符串一个关键词之间的相似度的问题。针对该问题给出了解决方法。 相似文献
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数字水印是有关多媒体信息内容安全的一种技术.本文应用离散脊波变换(Discrete Ridgelet Transform),设计并实现了一种基于离散眷波变换和离散小波变换的图像水印算法,算法分别在彩色图像的离散小波变换域和离散眷波变换域嵌入彩色图像水印,可以抵抗噪声、JPEG压缩、改变亮度、改变对比度、改变颜色、lens blur、缩放、剪切和一些联合攻击. 相似文献
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A Verifiably Encrypted Signature (VES) plays an essential role in the construction of a fair data exchange. The paper proposes an Identity-based Proxy Verifiably Encrypted Signature (IPVES) to combine the advantages of a proxy sig-nature and a VES in order to delegate the signing capability of the VES of an entity called the original signer to another entity, called the proxy signer. In this IPVES scheme, the original signer delegates his/her signing capability to the proxy signer. The proxy signer issues a signature by using a proxy signing key, encrypts the signature under a desig-nated public key, and subsequently convinces a ver-ifier that the resulting ciphertext contains such a signature. We prove that the proposed IPVES scheme is secure in a random oracle model under the computational Diffie-Hellman assumption. 相似文献
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