要数字签署大型文件，首先使用这些算法用一种安全的方式压缩(计算固定长度的哈希码)文件，然后再用私钥签署。
For digitally signing large files, the files are first compressed (the fixed-length hash is calculated) in a secure manner using these algorithms, and then signed with the private key.
类型属性指出了hash算法，例如消息摘要算法5 (MD5)或安全哈希算法(SHA - 1)。
The type attribute indicates the hash algorithm, such as Message-Digest algorithm 5 (MD5) or Secure Hashing algorithm (SHA-1).
用于检索“安全哈希算法”修订版的掩码，该修订版更正了SHA中的一个未发布的错误。
A mask used to retrieve a revision of the Secure Hash Algorithm that corrects an unpublished flaw in SHA.
不幸的是，这个哈希函数不是非常安全，它可以通过字典攻击算法被破解类似命令行应用程序！
Unfortunately, this is not a very secure hash function, it can be a dictionary attack to break algorithm similar to the command-line application!
哈希算法在信息安全领域主要应用于验证数据完整性和签名认证。
In the field of communication security, the main applications of the hash function are data integrity verification and signature authentication.
介绍基于对称密码系统的可证明安全理论，利用平方哈希函数实现技术，对一种可证明安全算法DFC实施改进后，安全性没有损失，但是速度得到了提高。
In this paper, based on provable security theory, a provable security cipher DFC is improved on speed without lost of security by means of fast implementation of square hash function.
介绍基于对称密码系统的可证明安全理论，利用平方哈希函数实现技术，对一种可证明安全算法DFC实施改进后，安全性没有损失，但是速度得到了提高。
In this paper, based on provable security theory, a provable security cipher DFC is improved on speed without lost of security by means of fast implementation of square hash function.
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