一、Encryption算法和Hash算法的区别 信息论角度: Encryption是可逆的,没有信息熵的改变 Hash是不可逆的,Hash一般会导致信息熵减小 应用角度: Encryption常被用来做基于密钥的数据加解密(AES、RSA、ECC) Hash主要被用来做数字签名、数据校验(CRC、SHA、MD5) 小白角度: Encryption就是带密码的保险箱 Hash就是榨汁机,...
什么是非对称加密(Asymmetric Key Encryption)? 非对称加密算法需要一对密钥(两个密钥):公开密钥(publickey)和私有密钥(privatekey)(简称公钥,私钥)。公开密钥与私有密钥生成时是一对,用公钥加密只能是对应的私钥解密,同理用私钥加密只能用对应的公钥解密。 基本过程: 甲方(主导方或者服务器方)生成一对密钥(也就是...
加密一般分为对称加密(Symmetric Key Encryption)和非对称加密(Asymmetric Key Encryption)常见的对称加密算法:DES、3DES、DESX、Blowfish、IDEA、RC4、RC5、RC6 和 AES常见的非对称加密算法:RSA、ECC (移动设备用)、Diffie-Hellman、El Gamal、DSA (数字签名用)常见的 Hash 算法:MD2、MD4、MD5、HAVAL、SHA、SHA-1...
<?php// Generate a random key, and salt to strengthen it during derivation.$inputKey = random_bytes(32);$salt = random_bytes(16);// Derive a pair of separate keys, using the same input created above.$encryptionKey = hash_hkdf('sha256', $inputKey, 32, 'aes-256-encryption', $salt...
网络安全通信中要用到两类密码算法,加密一般分为对称加密(Symmetric Key Encryption)和非对称加密(Asymmetric Key Encryption)。对称密码算法有时又叫传统密码算法、秘密密钥算法或单密钥算法,非对称密码算法也叫公开密钥密码算法或双密钥算法。对称密码算法的加密密钥能够从解密密钥中推算出来,反过来也成立。在大多数对称算...
A list with our encryption tools to create hashes from your sensitive data like passwords. You can also upload a file to create a checksum or provide a shared HMAC key.Convert ... to ... Online converter Convert media files online from one format into another. Please select the target ...
网络安全通信中要用到两类密码算法,加密一般分为对称加密(Symmetric Key Encryption)和非对称加密(Asymmetric Key Encryption)。对称密码算法有时又叫传统密码算法、秘密密钥算法或单密钥算法,非对称密码算法也叫公开密钥密码算法或双密钥算法。对称密码算法的加密密钥能够从解密密钥中推算出来,反过来也成立。在大多数对称算...
Encryption: Subkey = HashFunction(Key || InitialVector/Counter_{i}) \\ i = 0 \\ Cipher_{i} = Plain_{i} \oplus HashFunction(Key/Subkey || Subkey/Counter_{i}) \\ Cipher_{i+2} = Plain_{i+1} \oplus HashFunction(Key/Subkey || Cipher_{i}) \\ Decryption: Subkey = Hash...
An improved H.264/AVC comprehensive video encryption scheme is proposed. In the proposed scheme, the intra-prediction mode, motion vector difference, and quantization coefficients are encrypted. A novel hierarchical key generation method is likewise proposed, in which the encryption keys are generated ...
This paper proposes a color image encryption scheme using one-time keys based on crossover operator, chaos and the Secure Hash Algorithm(SHA-2). The (SHA-2) is employed to generate a 256-bit hash value from both the plain-image and the secret hash keys to make the key stream change in...