system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
__author__ = 'kbohlen'

from crypto.algorithms.algorithminterface import AlgorithmInterface

from Crypto.PublicKey import RSA

''' 
Description of RSAPublicKey

RSA is a public key cryptosystem, also called asymmetric ctyptography. It uses
a pair of keys, one public and one private for encryption. The benefit of this
is that it does not require shared information like a symmetric key to create
a secure channel. 

A user of RSA creates and then publishes a public key based on two large prime
numbers, along with an auxiliary value. The prime numbers must be kept secret.
Anyone can use the public key to encrypt a message, but with currently
published methods, if the public key is large enough, only someone with
knowledge of the prime numbers can feasibly decode the message.
'''
class RSAPublicKey(AlgorithmInterface):

    def __init__(self, arguments):
        ''' 
        generate the public / private key pair to be used
        '''
        key_size = 1024
        self.key = RSA.generate(key_size)
        self.publickey = self.key.publickey()
        self.other_publickey = None

    def sendFirstMessage(self):
        ''' 
        we need to send the other person our own public key
        '''
        return self.publickey.exportKey(passphrase='pychat')
    
    def receiveFirstMessage(self, firstMessage):
        ''' 
        we should recieve the other persons public key
        '''
        self.other_publickey = RSA.importKey(firstMessage, passphrase='pychat')
        return False #returning True attempts to decrypt the message (ATM)

    def encryptString(self, unencryptedMessage):
        ''' 
        must encrypt with other users public key (self.other_publickey)
        '''
        encryptedMessage = self.other_publickey.encrypt(unencryptedMessage)
        return encryptedMessage

    def decryptString(self, encryptedMessage):
        ''' 
        assuming that the encrypted message was encrypted with self.publickey
        generated above we can decrypt with our private key (self.key)
        '''
        decryptedMessage = self.key.decrypt(encryptedMessage)
        return self._unpad(decryptedMessage).decode('utf-8')

```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-295: Improper Certificate Validation
  B) CWE-326: Inadequate Encryption Strength
  C) CWE-116: Improper Encoding or Escaping of Output
  D) CWE-215: Insertion of Sensitive Information Into Debugging Code
  E) CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  F) CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Answer: B