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Android signature sha 1 with RSA sha256 with RSA md5 with RSA.
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Md5s ha1sha256sha512 are all abstract functions in essence, and the difference lies in their length:

MD5 is 128 bit,

SHA 1 Yes 160,

SHA256 is 256 bits,

SHA5 12 is 5 12.

SHA 1WithRSA His core algorithm is to digest it with sha 1 and then encrypt it with RSA. But he added something about the algorithm in the process of sha 1.

Functional features:

SHA 1: public key post-processing returns. SHA 1 irreversible, impact resistant.

MD5: Tamper-proof

MD5 and SHA 1 are two encryption algorithms, which are used to calculate an irreversible value to verify whether the file has been modified.

AES: faster, compatible with equipment, high security level;

DES: Local data, low security level.

RSA: Asymmetric encryption, with public key and private key.