Shulou(Shulou.com)06/01 Report--

The basic concept of 0x01 OpenSSL

OpenSSL is a protocol that provides security and data integrity for network communication, including major cryptographic algorithms, commonly used key and certificate encapsulation management functions, and SSL protocol.

Basic concepts of 0x02 encryption and decryption

Here is the process of encryption and decryption:

File encryption: original data-> one-way encryption extract signature-> use private key to encrypt signature and attach to original data-> use symmetric encryption algorithm to encrypt all data-> use decryptor's public key encryption password to attach to encrypted data file decryption: use your own private key to decrypt data encrypted by the other party with your own public key- > decrypting symmetrically encrypted data using a symmetric secret key-> decrypting a signature using the encrypter's public key-> verifying a signature using an one-way encryption algorithm to verify data integrity

There are two commonly used encryption techniques, symmetric encryption and asymmetric encryption:

Symmetric encryption: both sides of the communication use the same secret key, the data sender uses the secret key to encrypt the data, and the receiver uses the same secret key for decryption. Asymmetric encryption: the sender uses the receiver's public key to encrypt the data, and the receiver can decrypt it with its own private key. Public key: relative private key can be publicly circulated, encrypted private key for data: no outflow is allowed, and it is used to decrypt the data encrypted by the corresponding public key.

0x03 uses OpenSSL for encryption

Symmetric encryption: openssl enc des3-a-salt-in [File_Name]-out [File_Name]

Root@Qiudays /] # openssl enc-des3-a-salt-in / test-out / test_jami enter des-ede3-cbc encryption password: # enter the encryption password Verifying-enter des-ede3-cbc encryption password: determine the encryption password des3 # encryption algorithm-a # encoding format-salt # add salt-in # followed by the file to be encrypted -out # followed by encrypted files

Before encryption:

[root@Qiudays /] # cat test Qiudays

After encryption:

[root@Qiudays /] # cat test_jami U2FsdGVkX1 * esyJamp so4zcWPDXvzNroomj88CA3k1WB3QIC =

One-way encryption: openssl dgst-md5 [File_Name]

[root@Qiudays /] # openssl dgst-md5 test MD5 (test) = 45e9b44d313c128548e42bfff7ba88dc-MD5 # encrypt with MD5 algorithm

0x04 random number encrypted user password

Openssl passwd-1-salt 'openssl rand-base64 digits'

[root@Qiudays /] # openssl passwd-1-salt 'openssl rand-base64 55'Password: $1$ openssl $svda7I/3byMe2z893Jy8r.

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