SHA1 (Secure Hashing Algorithm 1) is a hashing algorithm to generate the digital signature (hash) of a document. The signature verifies who created the document (the signer) and that the document wasn’t altered. SHA1 is not an encryption algorithm. Examples of encryption algorithm are AES, DES, RC4, etc.
SHA1 is phasing out by the web browsers (Microsoft, Mozilla, Google) starting on January 1, 2016. The SSL certificate signed by SHA1 should be replaced with a new one signed by SHA2.
To check the SSL certificate on a web server, use
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