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DSA stands for “Digital Signature Algorithm” - and is specifically designed to produce digital signatures, not perform encryption.
DSA stands for “Digital Signature Algorithm” - and is specifically designed to produce digital signatures, not perform encryption.
OpenSSL Commands for generating DSA Param, Singing File & verify File
openssl dsaparam 2048 < /dev/random > dsa_param.pem
openssl gendsa dsa_param.pem -out dsa_priv.pem
openssl dsa -in dsa_priv.pem -pubout -out dsa_pub.pem
# DSA system now made up of: dsa_param.pem, dsa_pub.pem, dsa_priv.pem
echo "foobar" > foo.txt
openssl sha1 < foo.txt > foo.txt.sha1
openssl dgst -dss1 -sign dsa_priv.pem foo.txt.sha1 > foo.txt.sig
openssl dgst -dss1 -verify dsa_pub.pem -signature foo.txt.sig foo.txt.sha1
DSA key generation is related to, but somewhat more complex than El Gamal. Mostly because of the use of the secondary 160-bit modulus q used to help speed up calculations and reduce the size of the resulting signature.
To sign a message M
r = (g power k(mod p))(mod q)
s = k-1.SHA(M)+ x.r (mod q)
to verify a signature, compute: