AttackFlow Findings Dictionary

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Insecure Encryption Algorithm

An attacker can break the encryption algorithm used and find the plain text secret keys, passwords and other credentials that were thought to be “protected” using encryption algorithms

Severity

Critical

Fix Cost

High

Trust Level

High

Cryptography is a very complex, sophisticated but attractive branch of mathematics and computer science. To this end, we, as developers, usually fall into the error of writing of our own cryptographic functions, such as encryption algorithms. However, in the hands of a cryptologist, our custom algorithms, no matter how smart we think we are, these custom algorithms will be torn down to pieces in a very short time.

Even the encryption algorithms that were proven to be secure in early times are announced to be insecure with time passing. DES or RC2 are two examples of these broken encryption algorithms.

There are many cryptographic hash functions, however, most of them are insecure. Two examples of insecure hash functions are;

            
DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();

MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memoryStream,
cryptoProvider.CreateEncryptor(keyBytes, ivBytes),
CryptoStreamMode.Write);
                                        	 
StreamWriter writer = new StreamWriter(cryptoStream);
writer.Write(sensitiveData);
writer.Flush();
cryptoStream.FlushFinalBlock();
writer.Flush();
return Convert.ToBase64String(memoryStream.GetBuffer(), 0, (int)memoryStream.Length);

                
            

There are various vulnerability types in encryption algorithms and some of these attacks are;

  • Side-channel attacks
  • Chosen cipher-text attacks
  • Selective opening attacks

Using weak encryption algorithms will create a false sense of security. We would think that our encrypted data will never be decrypted and stay hidden as long as we want, however that wouldn’t be true if we don’t use solid encryption algorithms or follow secure encryption processes.

Cryptography is a very complex, sophisticated but attractive branch of mathematics and computer science. To this end, we, as developers, usually fall into the error of writing of our own cryptographic functions, such as encryption algorithms. However, in the hands of a cryptologist, our custom algorithms, no matter how smart we think we are, these custom algorithms will be torn down to pieces in a very short time.

Even the encryption algorithms that were proven to be secure in early times are announced to be insecure with time passing. DES or RC2 are two examples of these broken encryption algorithms.


KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
SecretKey desKey = keyGenerator.generateKey();

Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

desCipher.init(Cipher.ENCRYPT_MODE, desKey);

byte[] text = SensitiveData.getBytes();
byte[] encryptedText = desCipher.doFinal(text);


There are various vulnerability types in encryption algorithms and some of these attacks are;

  • Side-channel attacks
  • Chosen cipher-text attacks
  • Selective opening attacks

Using weak encryption algorithms will create a false sense of security. We would think that our encrypted data will never be decrypted and stay hidden as long as we want, however that wouldn’t be true if we don’t use solid encryption algorithms or follow secure encryption processes.

Cryptography is a very complex, sophisticated but attractive branch of mathematics and computer science. To this end, we, as developers, usually fall into the error of writing of our own cryptographic functions, such as encryption algorithms. However, in the hands of a cryptologist, our custom algorithms, no matter how smart we think we are, these custom algorithms will be torn down to pieces in a very short time.

Even the encryption algorithms that were proven to be secure in early times are announced to be insecure with time passing. DES or RC2 are two examples of these broken encryption algorithms.


KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
SecretKey desKey = keyGenerator.generateKey();

Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

desCipher.init(Cipher.ENCRYPT_MODE, desKey);

byte[] text = SensitiveData.getBytes();
byte[] encryptedText = desCipher.doFinal(text);

There are various vulnerability types in encryption algorithms and some of these attacks are;

  • Side-channel attacks
  • Chosen cipher-text attacks
  • Selective opening attacks

Using weak encryption algorithms will create a false sense of security. We would think that our encrypted data will never be decrypted and stay hidden as long as we want, however that wouldn’t be true if we don’t use solid encryption algorithms or follow secure encryption processes.

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