To enhance the security of the Lightning address generation process, you can introduce a salt value and use a stronger hashing algorithm. Here's an updated version of the code that incorporates these security enhancements:

```python

import hashlib

import base58

import secrets

def generate_lightning_address(email_address):

# Generate a random salt value

salt = secrets.token_bytes(16)

# Prepare the email address by converting it to lowercase and removing whitespace

email_address = email_address.lower().strip()

# Concatenate the salt and email address

data = salt + email_address.encode()

# Calculate the SHA256 hash of the concatenated data

email_hash = hashlib.sha256(data).digest()

# Take the first 10 bytes of the hash and append them with a version byte (0x02)

payload = b'\x02' + email_hash[:10]

# Calculate the checksum by taking the double SHA256 hash of the payload

checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4]

# Append the checksum to the payload

data = payload + checksum

# Convert the data to a Base58 encoded string

lightning_address = base58.b58encode(data)

return lightning_address.decode()

# Usage example:

email = 'example@example.com'

lightning_address = generate_lightning_address(email)

print(f"Lightning Address for {email}: {lightning_address}")

```

In this updated version, a random salt value is generated using the `secrets` module. The salt value is then concatenated with the email address before hashing, making it more resistant to precomputed attacks. Additionally, the code uses the `hashlib.sha256` function for the hashing algorithm.

Remember that security is a complex topic, and this code example represents only a portion of a secure implementation. It's important to thoroughly evaluate your specific security requirements and consider other factors like key management, input validation, and protection against potential vulnerabilities.