Its a method to convert text into a text which is not the original to protect information and data.
Encryption was first used in the world war 2. If spies would carry letters with regular text and were caught they will all be in danger so the Germans invented a machine with the Enigma Cipher which was a strong encryption cipher to encrypt messages. Of course later a Polish Engineer was able to find a Decryption Cipher to see the regular text of that message. After that there was many secrets found in the letters and many counter attacks leaded to Germany's weakness.
After the war was ended even now there are thousands of Encryption ciphers which we use daily. There are famous Encryptions such as MD5, RC4 and Triple-DES.
What is a cipher?
Its a method of protecting text. The MD5 is a cipher. RC4 is a cipher. Enigma is a Cipher.
Ok to make you understand more clearly lets do a demonstration.
Text: hackcommunity
Cipher: Replace a with 5, replace m with 2, replace i with 1
Output: h5ckco22un1ty
Now you understand what i mean? Smile
Some Text need a key to be Encrypted for even more protection. RC4 requires a key which can even be a blank space. You can later decrypt the Encrypted text with the key or you can brute force the key with special programs of course that will take time.
Encryption is mostly used these days in Mails. Why?
No one is safe. You might be hacked someday and have really important messages including credit card passwords, phone numbers, addresses, names, political issues, secret matters, ... in the hands of the hacker.
To prevent something like that you can make a deal with the person your mailing. Like for example that person knows your name in English, You can send him a RC4 encrypted text telling him the key is my real name only then the receiver ONLY can read the protected text.
There are sites which offer online Encryption such as www.crypo.com which i recommend highly due to many ciphers available.
Encryptions are also used in hack tools to prevent detection and increase UD ( Undetectability ). For example, a string stored in the program can be: "KillAntiVirus" which can be a detection, we can use functions to decrypt a protected text. For example we used hex cipher to encrypt that text. it will now be:
And using it with a function will be:
Which will result in returning our original text
Here is a few functions in VB.NET and C# which you can use to encrypt and decrypt your programs with (credits to hackyer):
[VB.NET]
-----------------
[C#]
Spoiler: MD5
Code:
public string MD5Hash(string input)
{
System.Security.Cryptography.MD5CryptoServiceProvider MD5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] Data = null;
byte[] Result = null;
string Res = "";
string Tmp = "";
Data = System.Text.Encoding.ASCII.GetBytes(input);
Result = MD5.ComputeHash(Data);
for (int i = 0; i <= Result.Length - 1; i++) {
Tmp = Conversion.Hex(Result);
if (Strings.Len(Tmp) == 1)
Tmp = "0" + Tmp;
Res += Tmp;
}
return Res;
}
[C#]
Spoiler: Hex Encode
Code:
public string Hex_Encrypt(string input)
{
System.Text.StringBuilder @out = new System.Text.StringBuilder();
foreach (string c in input) {
string temp = Conversion.Hex(Strings.Asc(c));
@out.Append(temp + " ");
}
return @out.ToString().Substring(0, @out.Length - 1);
}
[C#]
Spoiler: Hex Decode
Code:
public string Hex_Decrypt(string input)
{
System.Text.StringBuilder @out = new System.Text.StringBuilder();
string[] data = Strings.Split(input, " ");
foreach (string s in data) {
@out.Append(Strings.Chr("&H" + s));
}
return @out.ToString();
}
[C#]
Spoiler: Triple-DES Encode
Code:
public string TripleDES_Encrypt(string input, string pass)
{
System.Security.Cryptography.TripleDESCryptoServiceProvider TripleDES = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
System.Security.Cryptography.MD5CryptoServiceProvider Hash_TripleDES = new System.Security.Cryptography.MD5CryptoServiceProvider();
string encrypted = "";
try {
byte[] hash = new byte[24];
byte[] temp = Hash_TripleDES.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(pass));
Array.Copy(temp, 0, hash, 0, 16);
Array.Copy(temp, 0, hash, 15, 8);
TripleDES.Key = hash;
TripleDES.Mode = System.Security.Cryptography.CipherMode.ECB;
System.Security.Cryptography.ICryptoTransform DESEncrypter = TripleDES.CreateEncryptor();
byte[] Buffer = System.Text.ASCIIEncoding.ASCII.GetBytes(input);
encrypted = Convert.ToBase64String(DESEncrypter.TransformFinalBlock(Buffer, 0, Buffer.Length));
return encrypted;
} catch (Exception ex) {
}
}
[C#]
Spoiler: Triple-DES Decode
Code:
public string TripleDES_Decrypt(string input, string pass)
{
System.Security.Cryptography.TripleDESCryptoServiceProvider TripleDES = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
System.Security.Cryptography.MD5CryptoServiceProvider Hash_TripleDES = new System.Security.Cryptography.MD5CryptoServiceProvider();
string decrypted = "";
try {
byte[] hash = new byte[24];
byte[] temp = Hash_TripleDES.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(pass));
Array.Copy(temp, 0, hash, 0, 16);
Array.Copy(temp, 0, hash, 15, 8);
TripleDES.Key = hash;
TripleDES.Mode = System.Security.Cryptography.CipherMode.ECB;
System.Security.Cryptography.ICryptoTransform DESDecrypter = TripleDES.CreateDecryptor();
byte[] Buffer = Convert.FromBase64String(input);
decrypted = System.Text.ASCIIEncoding.ASCII.GetString(DESDecrypter.TransformFinalBlock(Buffer, 0, Buffer.Length));
return decrypted;
} catch (Exception ex) {
}
}
[C#]
Spoiler: RC4 Encode
Code:
public string RC4_Encrypt(string message, string password)
{
int i = 0;
int j = 0;
StringBuilder cipher = new StringBuilder();
string returnCipher = string.Empty;
int[] sbox = new int[257];
int[] key = new int[257];
int intLength = password.Length;
int a = 0;
while (a <= 255) {
char ctmp = (password.Substring((a % intLength), 1).ToCharArray()[0]);
key[a] = Microsoft.VisualBasic.Strings.Asc(ctmp);
sbox[a] = a;
System.Math.Max(System.Threading.Interlocked.Increment(ref a), a - 1);
}
int x = 0;
int b = 0;
while (b <= 255) {
x = (x + sbox + key) % 256;
int tempSwap = sbox;
sbox = sbox[x];
sbox[x] = tempSwap;
System.Math.Max(System.Threading.Interlocked.Increment(ref b), b - 1);
}
a = 1;
while (a <= message.Length) {
int itmp = 0;
i = (i + 1) % 256;
j = (j + sbox) % 256;
itmp = sbox;
sbox = sbox[j];
sbox[j] = itmp;
int k = sbox[(sbox + sbox[j]) % 256];
char ctmp = message.Substring(a - 1, 1).ToCharArray()[0];
itmp = Strings.Asc(ctmp);
int cipherby = itmp ^ k;
cipher.Append(Strings.Chr(cipherby));
System.Math.Max(System.Threading.Interlocked.Increment(ref a), a - 1);
}
returnCipher = cipher.ToString;
cipher.Length = 0;
return returnCipher;
}
[C#]
Spoiler: Base64 Encode
Code:
public object ConvertToBase64(string Input)
{
return Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(Input));
}
[C#]
Spoiler: Base64 Decode
Code:
public object ConvertFromBase64(string Input)
{
byte[] B = System.Convert.FromBase64String(Input);
return System.Text.Encoding.UTF8.GetString(B);
}
[C#]
Spoiler: Binary Encode
Code:
public string Binary_Encrypt(string input)
{
string Val = null;
string Characters = System.Text.RegularExpressions.Regex.Replace(input, "[^01]", "");
byte[] ByteArray = new byte[(Characters.Length / 8)];
for (int Index = 0; Index <= ByteArray.Length - 1; Index++) {
ByteArray[Index] = Convert.ToByte(Characters.Substring(Index * 8, 8), 2);
}
Val = System.Text.ASCIIEncoding.ASCII.GetString(ByteArray);
return Val;
}
[C#]
Spoiler: Binary Decode
Code:
public string Binary_Decrypt(string input)
{
string Val = null;
System.Text.StringBuilder Result = new System.Text.StringBuilder();
foreach (byte Character in System.Text.ASCIIEncoding.ASCII.GetBytes(input)) {
Result.Append(Convert.ToString(Character, 2).PadLeft(8, "0"));
Result.Append(" ");
}
Val = Result.ToString().Substring(0, Result.ToString().Length - 1);
return Val;
}
PS: Correct me if i'm wrong in something i wrote =]
Encryption was first used in the world war 2. If spies would carry letters with regular text and were caught they will all be in danger so the Germans invented a machine with the Enigma Cipher which was a strong encryption cipher to encrypt messages. Of course later a Polish Engineer was able to find a Decryption Cipher to see the regular text of that message. After that there was many secrets found in the letters and many counter attacks leaded to Germany's weakness.
After the war was ended even now there are thousands of Encryption ciphers which we use daily. There are famous Encryptions such as MD5, RC4 and Triple-DES.
What is a cipher?
Its a method of protecting text. The MD5 is a cipher. RC4 is a cipher. Enigma is a Cipher.
Ok to make you understand more clearly lets do a demonstration.
Text: hackcommunity
Cipher: Replace a with 5, replace m with 2, replace i with 1
Output: h5ckco22un1ty
Now you understand what i mean? Smile
Some Text need a key to be Encrypted for even more protection. RC4 requires a key which can even be a blank space. You can later decrypt the Encrypted text with the key or you can brute force the key with special programs of course that will take time.
Encryption is mostly used these days in Mails. Why?
No one is safe. You might be hacked someday and have really important messages including credit card passwords, phone numbers, addresses, names, political issues, secret matters, ... in the hands of the hacker.
To prevent something like that you can make a deal with the person your mailing. Like for example that person knows your name in English, You can send him a RC4 encrypted text telling him the key is my real name only then the receiver ONLY can read the protected text.
There are sites which offer online Encryption such as www.crypo.com which i recommend highly due to many ciphers available.
Encryptions are also used in hack tools to prevent detection and increase UD ( Undetectability ). For example, a string stored in the program can be: "KillAntiVirus" which can be a detection, we can use functions to decrypt a protected text. For example we used hex cipher to encrypt that text. it will now be:
And using it with a function will be:
Which will result in returning our original text
Here is a few functions in VB.NET and C# which you can use to encrypt and decrypt your programs with (credits to hackyer):
[VB.NET]
-----------------
[C#]
Spoiler: MD5
Code:
public string MD5Hash(string input)
{
System.Security.Cryptography.MD5CryptoServiceProvider MD5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] Data = null;
byte[] Result = null;
string Res = "";
string Tmp = "";
Data = System.Text.Encoding.ASCII.GetBytes(input);
Result = MD5.ComputeHash(Data);
for (int i = 0; i <= Result.Length - 1; i++) {
Tmp = Conversion.Hex(Result);
if (Strings.Len(Tmp) == 1)
Tmp = "0" + Tmp;
Res += Tmp;
}
return Res;
}
[C#]
Spoiler: Hex Encode
Code:
public string Hex_Encrypt(string input)
{
System.Text.StringBuilder @out = new System.Text.StringBuilder();
foreach (string c in input) {
string temp = Conversion.Hex(Strings.Asc(c));
@out.Append(temp + " ");
}
return @out.ToString().Substring(0, @out.Length - 1);
}
[C#]
Spoiler: Hex Decode
Code:
public string Hex_Decrypt(string input)
{
System.Text.StringBuilder @out = new System.Text.StringBuilder();
string[] data = Strings.Split(input, " ");
foreach (string s in data) {
@out.Append(Strings.Chr("&H" + s));
}
return @out.ToString();
}
[C#]
Spoiler: Triple-DES Encode
Code:
public string TripleDES_Encrypt(string input, string pass)
{
System.Security.Cryptography.TripleDESCryptoServiceProvider TripleDES = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
System.Security.Cryptography.MD5CryptoServiceProvider Hash_TripleDES = new System.Security.Cryptography.MD5CryptoServiceProvider();
string encrypted = "";
try {
byte[] hash = new byte[24];
byte[] temp = Hash_TripleDES.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(pass));
Array.Copy(temp, 0, hash, 0, 16);
Array.Copy(temp, 0, hash, 15, 8);
TripleDES.Key = hash;
TripleDES.Mode = System.Security.Cryptography.CipherMode.ECB;
System.Security.Cryptography.ICryptoTransform DESEncrypter = TripleDES.CreateEncryptor();
byte[] Buffer = System.Text.ASCIIEncoding.ASCII.GetBytes(input);
encrypted = Convert.ToBase64String(DESEncrypter.TransformFinalBlock(Buffer, 0, Buffer.Length));
return encrypted;
} catch (Exception ex) {
}
}
[C#]
Spoiler: Triple-DES Decode
Code:
public string TripleDES_Decrypt(string input, string pass)
{
System.Security.Cryptography.TripleDESCryptoServiceProvider TripleDES = new System.Security.Cryptography.TripleDESCryptoServiceProvider();
System.Security.Cryptography.MD5CryptoServiceProvider Hash_TripleDES = new System.Security.Cryptography.MD5CryptoServiceProvider();
string decrypted = "";
try {
byte[] hash = new byte[24];
byte[] temp = Hash_TripleDES.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(pass));
Array.Copy(temp, 0, hash, 0, 16);
Array.Copy(temp, 0, hash, 15, 8);
TripleDES.Key = hash;
TripleDES.Mode = System.Security.Cryptography.CipherMode.ECB;
System.Security.Cryptography.ICryptoTransform DESDecrypter = TripleDES.CreateDecryptor();
byte[] Buffer = Convert.FromBase64String(input);
decrypted = System.Text.ASCIIEncoding.ASCII.GetString(DESDecrypter.TransformFinalBlock(Buffer, 0, Buffer.Length));
return decrypted;
} catch (Exception ex) {
}
}
[C#]
Spoiler: RC4 Encode
Code:
public string RC4_Encrypt(string message, string password)
{
int i = 0;
int j = 0;
StringBuilder cipher = new StringBuilder();
string returnCipher = string.Empty;
int[] sbox = new int[257];
int[] key = new int[257];
int intLength = password.Length;
int a = 0;
while (a <= 255) {
char ctmp = (password.Substring((a % intLength), 1).ToCharArray()[0]);
key[a] = Microsoft.VisualBasic.Strings.Asc(ctmp);
sbox[a] = a;
System.Math.Max(System.Threading.Interlocked.Increment(ref a), a - 1);
}
int x = 0;
int b = 0;
while (b <= 255) {
x = (x + sbox + key) % 256;
int tempSwap = sbox;
sbox = sbox[x];
sbox[x] = tempSwap;
System.Math.Max(System.Threading.Interlocked.Increment(ref b), b - 1);
}
a = 1;
while (a <= message.Length) {
int itmp = 0;
i = (i + 1) % 256;
j = (j + sbox) % 256;
itmp = sbox;
sbox = sbox[j];
sbox[j] = itmp;
int k = sbox[(sbox + sbox[j]) % 256];
char ctmp = message.Substring(a - 1, 1).ToCharArray()[0];
itmp = Strings.Asc(ctmp);
int cipherby = itmp ^ k;
cipher.Append(Strings.Chr(cipherby));
System.Math.Max(System.Threading.Interlocked.Increment(ref a), a - 1);
}
returnCipher = cipher.ToString;
cipher.Length = 0;
return returnCipher;
}
[C#]
Spoiler: Base64 Encode
Code:
public object ConvertToBase64(string Input)
{
return Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(Input));
}
[C#]
Spoiler: Base64 Decode
Code:
public object ConvertFromBase64(string Input)
{
byte[] B = System.Convert.FromBase64String(Input);
return System.Text.Encoding.UTF8.GetString(B);
}
[C#]
Spoiler: Binary Encode
Code:
public string Binary_Encrypt(string input)
{
string Val = null;
string Characters = System.Text.RegularExpressions.Regex.Replace(input, "[^01]", "");
byte[] ByteArray = new byte[(Characters.Length / 8)];
for (int Index = 0; Index <= ByteArray.Length - 1; Index++) {
ByteArray[Index] = Convert.ToByte(Characters.Substring(Index * 8, 8), 2);
}
Val = System.Text.ASCIIEncoding.ASCII.GetString(ByteArray);
return Val;
}
[C#]
Spoiler: Binary Decode
Code:
public string Binary_Decrypt(string input)
{
string Val = null;
System.Text.StringBuilder Result = new System.Text.StringBuilder();
foreach (byte Character in System.Text.ASCIIEncoding.ASCII.GetBytes(input)) {
Result.Append(Convert.ToString(Character, 2).PadLeft(8, "0"));
Result.Append(" ");
}
Val = Result.ToString().Substring(0, Result.ToString().Length - 1);
return Val;
}
PS: Correct me if i'm wrong in something i wrote =]