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*Any private key value that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen, for extra security run this software on your network, no cloud dependency*

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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.

- The requirement for public/private keys in this system is for a slightly different purpose - whereas in RSA, a key is needed so anyone can encrypt, in DSA a key is needed so anyone can verify. In RSA, the private key allows decryption; in DSA, the private key allows signature creation.
- DSA
**Private**Key is used for generating**Signature**file - DSA
**public**Key is used for**Verifying**the Signature. - DSA is a variant on the ElGamal and Schnorr algorithms creates a 320 bit signature, but with 512-1024 bit security security again rests on difficulty of computing discrete logarithms has been quite widely accepted

**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
```

- firstly shared global public key values
**(p,q,g)**are chosen: - choose a large prime p = 2 power L where L= 512 to 1024 bits and is a multiple of 64
- choose q, a 160 bit prime factor of p-1
- choose g = h power (p-1)/q for any h1 then each user chooses a private key and computes their public key:
- choose x compute y = g power x(mod p)

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**

- generate random signature key k, k compute

```
r = (g power k(mod p))(mod q)
s = k-1.SHA(M)+ x.r (mod q)
```

- send signature (r,s) with message

**to verify a signature, compute:**

- w = s-1(mod q)
- u1= (SHA(M).w)(mod q)
- u2= r.w(mod q)
- v = (g power u1.y power u2(mod p))(mod q)

if v=r then the signature is verified

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- Generate Message Digest(Text)
- Generate Message Digest(File)
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