1. Log in to your AWS Management Console.
2. Navigate to the Amazon SNS console.
3. Click on the SNS topic that you want to remediate.
4. Click on the “Encryption” tab.
5. Select “Enable encryption” option.
6. Select the KMS key that you want to use to encrypt the topic.
7. Click on “Update” to save the changes.

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1. Identify the SNS topics that are not encrypted using KMS CMKs by running the following command:

aws sns list-topics --query "Topics[?KmsMasterKeyId == null].TopicArn" --output text

2. For each topic identified in step 1, create a new KMS CMK or use an existing one.
3. Enable server-side encryption for the SNS topic by updating its properties with the following command:

aws sns set-topic-attributes --topic-arn <topic-arn> --attribute-name KmsMasterKeyId --attribute-value <kms-key-id>

4. Verify that the SNS topic is now encrypted using KMS CMKs by running the following command:

aws sns list-topics --query "Topics[?KmsMasterKeyId != null].TopicArn" --output text

5. Repeat steps 3-4 for all the SNS topics that were identified in step 1.

1. First, you need to identify the SNS topic(s) that are not encrypted using KMS CMKs. You can use the AWS CLI or Boto3 library in Python to list all the SNS topics and their encryption status.
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   import boto3
   
   # Create an SNS client
   sns = boto3.client('sns')
   
   # List all SNS topics
   response = sns.list_topics()
   
   # Check encryption status for each topic
   for topic_arn in response['Topics']:
       topic_attributes = sns.get_topic_attributes(TopicArn=topic_arn['TopicArn'])
       if 'KmsMasterKeyId' not in topic_attributes['Attributes']:
           print(f"SNS topic {topic_arn['TopicArn']} is not encrypted using KMS CMKs")
   

2. Once you have identified the SNS topic(s) that are not encrypted using KMS CMKs, you can update their encryption settings using the set_topic_attributes() method in Boto3.
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   import boto3
   
   # Create an SNS client
   sns = boto3.client('sns')
   
   # Update encryption settings for a specific topic
   topic_arn = 'arn:aws:sns:us-east-1:123456789012:my-topic'
   response = sns.set_topic_attributes(
       TopicArn=topic_arn,
       AttributeName='KmsMasterKeyId',
       AttributeValue='arn:aws:kms:us-east-1:123456789012:key/abcd1234-5678-90ab-cdef-1234567890ab'
   )
   
   print(f"Encryption settings updated for SNS topic {topic_arn}")
   

   Note: Replace the topic_arn and AttributeValue with the appropriate values for your AWS account.
3. Finally, you can verify that the SNS topic(s) are now encrypted using KMS CMKs by running the first code snippet again and checking the encryption status for each topic.
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   import boto3
   
   # Create an SNS client
   sns = boto3.client('sns')
   
   # List all SNS topics
   response = sns.list_topics()
   
   # Check encryption status for each topic
   for topic_arn in response['Topics']:
       topic_attributes = sns.get_topic_attributes(TopicArn=topic_arn['TopicArn'])
       if 'KmsMasterKeyId' not in topic_attributes['Attributes']:
           print(f"SNS topic {topic_arn['TopicArn']} is not encrypted using KMS CMKs")
       else:
           print(f"SNS topic {topic_arn['TopicArn']} is encrypted using KMS CMKs")
   

   This should return a list of all SNS topics and their encryption status.